Tecnologia em Metalurgia, Materiais e Mineração
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Tecnologia em Metalurgia, Materiais e Mineração



Archive

Volume 18, 2021

18, 2021

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”

https://doi.org/10.4322/2176-1523.20211801
Editorial: Telmo Roberto Strohaecker (1955-2016) Luiz Carlos Pereira, Afonso Reguly Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20202455
Probing underlying mechanisms for pcBN tool decay during friction stir welding of nickel-based alloys Buchibabu Vicharapu, Guilherme Vieira Braga Lemos, Luciano Bergmann, Jorge Fernandez dos Santos, Amitava De, Thomas Clarke Friction stir welding; Inconel 625; pcBN; W-Re; Peak temperature; Tool wear.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20202452
Manufacturing an upset end by friction welding in an API X65 steel Guilherme Vieira Braga Lemos, Diogo Buzzatti, Carla Amavisca, Giovani Dalpiaz, Marcelo Torres Piza Paes, Luis Kanan, Afonso Reguly Manufacturing; Friction welding; API X65; Upset end; Fatigue properties.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20202450
Influence of process parameters on mechanical properties of friction stir welded 5083-O aluminum alloy Nicole Brum, Carla Amavisca, Jerônimo Ghisi Schroeder, Jonas Buzzatti, Guilherme Vieira Braga Lemos, Diego Tolotti, Marcelo Favaro Friction stir welding; AA 5083-O; Process parameters; Mechanical properties

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20202453
The effect of cold working and solution heat treatment on microstructure and mechanical behavior of Ti35Nb2.5Sn alloy Silvando Vieira dos Santos, Gustavo Dória Lima, Brenno Lima Nascimento, Lucas Silva Fontes, Sandro Griza Ti35Nb2.5Sn; Beta titanium alloys; Heat treatment; Cold working.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20202458
Comparative study between crack tip opening displacement techniques by statistical analysis Matheus Lothar Schmidt, Guilherme Vieira Braga Lemos, Daniel Antonio Kapper Fabricio, Afonso Reguly Fracture toughness; Crack tip opening displacement; Tensile armour wire; Statistical analysis

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20212465
Investigating an API X65 steel pipe cladded with alloy 625 Rangel Knerek, Guilherme Vieira Braga Lemos, George Vander Voort, Diego Aires de Freitas, William Haupt, Renan Landell, Diogo Buzzatti Welding; Clad pipes; GTAW; TIG hotwire; API X65 steel; Alloy 625.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20212442
Deep cryogenic treatment in AISI D2 tool steel punches to enhance tool life Fabiano Dornelles Ramos, Josué de Oliveira Bairros, Mauro Francisco Castro Moscoso Deep Cryogenic; Treatment; Tool life; Tool steel.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20212374
Formation of hydrogen blisters during the solution treatment for aluminum alloys Daniel Diehl, Eduardo Luis Schneider, Thomas Gabriel Rosauro Clarke Aluminum alloys; Heat treatment; Hydrogen; Oxidation; Blister

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20212403
Residual stress states in cementite and ferrite in a combined cold drawing process of AISI 1045 steel using neutron diffraction and synchrotron radiation Rafael Menezes Nunes, Alexandre da Silva Rocha, Thomas Georg Karl Hirsch Combined cold drawing; Residual stress; Neutron diffraction; Synchrotron diffraction; Residual stresses; Cementite.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20212464
Joining of aluminium alloy and galvanized steel sheets multimaterial assembly using a gas metal arc based process Atanu Das, Sven-F Goecke, Amitava De Gas metal arc joining; Aluminium alloy; Galvanized steel; Thermal distortion.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20212448
Comparison of surface properties modification by direct and active screen plasma nitriding of an ASTM M2 high-speed steel in a nitrogen rich gas mixture Leonardo Fonseca Oliveira, Alexandre da Silva Rocha, Giovanni Rocha dos Santos Plasma nitriding; Active screen; ASTM M2 steel; Sliding wear.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20202407
Characterization of anodized and bare 7075-T6 aluminum alloy treated with Zr-based conversion coating Jéssica Salles Pinheiro, Claudia Trindade Oliveira, Gabriel Regio, Nicolle Goi, Jane Zoppas Ferreira Aluminum alloy; Anodizing; Conversion coating; Hydrophobicity.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20212463
Fatigue behaviour of an epoxy adhesive under mixed-mode conditions Mário Rui Oliveira Cunha, Ricardo João Camilo Carbas, Eduardo André Sousa Marques, Alireza Akhavan-Safar, Lucas Filipe Martins da Silva Epoxy adhesive; Fatigue loads; Mixed-mode tests; Fracture envelope.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20212473
Method validation for fatigue testing in kingpins Jonas Trento Buzzatti, Daniel Antonio Kapper Fabricio, Guilherme Vieira Braga Lemos, Hilton Rutsatz, Guilherme Kieckow, Fabiano Mattei, Etiene Benini Mendes Method validation; Metrology; Fatigue testing; Kingpin

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20212411
Stress corrosion cracking of carbon steels on CO2 /H2 O systems Mariana dos Reis Tagliari, Pedro Craidy, Derek Fonseca, Marcelo Favaro Borges Stress corrosion cracking; CO2 /H2 O; High strength carbon steels.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20212469
Use of instrumented charpy testing on the fracture toughness characterization of metallic materials Luiz Carlos Pereira, Juan Carlos Garcia de Blas, Sandro Griza, Fathi Aref Ibrahim Darwish Instrumented Charpy test; Dynamic Fracture Toughness; Ductile-brittle transition.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20212466
Analysis of the applicability of polymeric solutions as cooling fluid in the quenching of low-alloy steels Eduardo da Rosa Vieira, Jorge Luis Braz Medeiros, Luciano Volcanoglo Biehl, Vagner Machado Costa, Carlos Otávio Damas Martins, José de Souza Manufacturing; Quenching; Polymer solutions; Low alloy steels.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20212467
Applying multiparametric ultrasonic nondestructive test for structural characterization of age hardened aluminum alloy Erick Cerqueira das Neves, Ivan Costa e Silva, Jorge Luis Braz Medeiros, Luciano Volcanoglo Biehl, Carlos Otávio Damas Martins Structural integrity; Materials manufacturing; Quality control; Nondestructive tests; Multiparametric analysis; Ultrasonic waves.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20212451
Quantitative analysis of localized corrosion in tensile armor wire of flexible riser submitted to sweet stress corrosion cracking testing with crevice Matheus Porto Trindade, Ihana Gabriela Conceição de Jesus, Matheus Mariano da Silva Reis, Brenno Lima Nascimento, Fabricio Pinheiro dos Santos, Sandro Griz Risers; Crevice corrosion; Stress corrosion; Tensile armor wires.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”
https://doi.org/10.4322/2176-1523.20212449
Study of fatigue crack growth behavior of cold worked and aged TiNbSn alloys Tiago Nunes Lima, Thiago Figueiredo Azevedo, Luiz Carlos Pereira, Sandro Griza TiNbSn alloy; Cold working; Aging; Fatigue crack growth.

Original Article - Special issue “Tribute to Prof. T. R. Strohaecker”

Original Article

https://doi.org/10.4322/2176-1523.20212227
Optimization of semisolid AA356 raw material processing Luis Vanderlei Torres, Eugênio José Zoqui Thixoforming; Semisolid material; AA356 alloy.

Original Article
https://doi.org/10.4322/2176-1523.20212140
Replacement of the gravel by ceramic waste from the lost wax casting process in the high resistence concretes Hueslei Grison Soares, Cleber Rodrigo de Lima Lessa Residue from casting; Lost wax casting; High resistance concrete; Reuse of residue.

Original Article
https://doi.org/10.4322/2176-1523.20212138
Evaluation of the permeability of latex gloves used in a laboratory for the handling of polymeric nanoparticles Laís Schmidt, Cristiane Bastos de Mattos, Vanusca Dalosto Jahno, Carlos Leonardo Pandolfo Carone, Luis Fernando Hoffmann, Cláudia Trindade Oliveira, Sandra Raquel Kunst, Jane Zoppas Ferreira, Fernando Dal Pont Morisso Gloves; Permeation; Franz diffusion cell; Nanoparticles.

Original Article
https://doi.org/10.4322/2176-1523.20212070
Heat treatment in Zamac to reduce porosity defects Fernando Konarzewski Dienstmann, Luciane Taís Fuhr, Leonardo Felix Scheffel, Carlos Leonardo Pandolfo Carone, Fernando Dal Pont Morisso, Eduardo Luís Schneider, Sandra Raquel Kunst, Jane Zoppas Ferreira, Cláudia Trindade Oliveira Zamac; Porosity; Heat treatment.

Original Article
https://doi.org/10.4322/2176-1523.20212236
Development of a refractory mortar formulation using industrial waste for application in civil construction Douglas Luiz Giordani, Alexandre Zaccaron, Thuanni Gesser Müller, Camila Machado de Oliveira, Fernanda Cristina Restelatto, Michael Peterson Refractory mortar; Cement; Waste recovery; Dilatometry.

Original Article
https://doi.org/10.4322/2176-1523.20212147
Technological properties of soil-cement brick with 2 holes Felipe Pinheiro Teixeira, Thaís Guedes Machado, Neilton Paixão de Jesus Junior , Simone Pereira Taguchi Borges, Rosinei Batista Ribeiro, Luiz Antônio Borges Júnior Brick; Soil-cement; Compression; Water absorption

Original Article
https://doi.org/10.4322/2176-1523.20212197
Effect of binder and drum speed on hematitic fines balling Fernando Rodrigues da Cunha, José Aurélio Medeiros da Luz, Pedro Henrique Neuppmann Granulation; Iron ore; Carboxymethylcellulose; Bentonite

Original Article
https://doi.org/10.4322/2176-1523.20212225
Temperature influence on the mechanical behavior of the ASTM A240 UNS S41003 ferritic stainless steel Amanda Aparecida de Fátima Arruda, Ana Cecília de Carvalho, Rhelman Rossano Urzêdo Queiroz, Geraldo Lúcio de Faria ASTM A240 UNS S41003; 410D; Hot tensile test; Ductile-brittle transition; Creep Sag Test.

Original Article
https://doi.org/10.4322/2176-1523.20212125
Study of the treatment of oxidation in different microstructures of the titanium alloy Fabrícia Assis Resende Gonçalves, Renata Jesuina Takahash, Danieli Aparecida Pereira Reis Ti-6Al-4V; Oxidation; Heat Treatment.

Original Article
https://doi.org/10.4322/2176-1523.20212480
Evaluation of compressive strength in geopolymer mortars produced using iron ore tailings ground by tumbling ball mills Eduardo Júnio D’ Almeida Silva, Douglas Batista Mazzinghy Mining wastes; Grinding; Coproducts; Sustainability; Circular economy.

Original Article
https://doi.org/10.4322/2176-1523.20212201
Effect of the casting thickness (3.2 to 5.8 mm) on the tensile strength of grey cast iron Felipe Fonseca de Oliveira Lima, Cesar Roberto de Farias Azevedo Pearlitic grey cast iron; Thin-wall casting; Tensile strength; Microstructural parameters; Mathematical model validation.

Original Article
https://doi.org/10.4322/2176-1523.20212483
Hidrothermal liquefaction of lignocellulosic residue to produce sustainable materials: fractions characterization Solange Kazue Utimura, Denise Crocce Romano Espinosa, Marco Antonio das Neves, Isao Kobayashi, Mitsutoshi Nakajima, Cristina Stewart Bogsan Hydrothermal liquefaction; Sugarcane bagasse; Subcritical conditions; Lignocellulosic residues; Materials; Waste

Original Article
https://doi.org/10.4322/2176-1523.20212519
A predictive model for hydrogen content in steel in non-degassed heats Beatriz de Paula Lopes, José Adilson de Castro, Leonardo Martins Demuner, André Luiz Vasconcellos da Costa e Silva Hydrogen; Steel; Steel plant

Original Article
https://doi.org/10.4322/2176-1523.20211682
Application of TOPSIS in evaluating the vacuum infusion process toward manufacturing of jute yarn composites Alessandro de Castro Corrêa, Jean da Silva Rodrigues, Tainã Fernandes Rodrigues, Carlos André Corrêa de Mattos, Danielle Cristina Gonzaga Corrêa, Cláudia Canto de Souza Leão Vacuum infusion process; TOPSIS; Entropy; Composite; Jute yarn.

Original Article
https://doi.org/10.4322/2176-1523.20212270
Influence of cutting parameters on ASTM A518 GR.3 alloy turning Grégori Folis Dagostin, Anderson Daleffe, Luiz Carlos de Cesaro Cavaler Machining; Turning; Cutting parameters; ASTM A518 GR.3.

Original Article
https://doi.org/10.4322/2176-1523.20212145
Comparative analysis between new and remelted commercial cast iron in a craft company with application in brake drums Licurgo Borges Winck, Gabriel dos Santos Camargo, Sergio Junio Martins Rodrigues, Thaís Neves Silva Cast iron; Casting; Rockwell hardness; Metallography.

Original Article
https://doi.org/10.4322/2176-1523.20212255
Study of the hot stamping of 22MnB5 steel with Al-Si coating Bruno César Cordeiro, André Rosiak, Thais Morato, Lirio Schaeffer Hot stamping; 22MnB5; Coating; Corrosion.

Original Article
https://doi.org/10.4322/2176-1523.20211984
Evaluation of performance of WC-CoCr coatings with HVOF and hard chrome for application in clay mixing machine Bruno Nicoladelli Netto; Reginaldo Rosso Marcello; Richard de Medeiros Castro; Elvys Isaías Mercado Curi; Luiz Carlos de Cesaro Cavaler Mixers; Nodular cast iron; Wear; Hard Chrome; WC-CoCr

Original Article
https://doi.org/10.4322/2176-1523.20212333
Analysis of pack carburizing followed by diretct quenching applied to spur gears (module 2) of SAE 8620 steel Bruno Lessmann Fertig, Jean Senise Pimenta Pack carburizing; Direct quenching; Spur gear; SAE 8620 steel.

Original Article
https://doi.org/10.4322/2176-1523.20212373
Evaluation of iron ore typology in sticking tests Jean Philippe Santos Gherardi de Alencar, Gabriel Silva do Carmo, Natállia Luiza Antunes Silva, Nathália Duarte Bastos, Pedro Silva Figueiredo Iron ore; Flowability; Handling; Moisture.

Original Article
https://doi.org/10.4322/2176-1523.20212143
Influence of the substrate doping type on thin bifacial solar cells Graziella Fernandes Nassau Costa, Adriano Moehlecke, Izete Zanesco Bifacial solar cells; Thin Si wafers; N-type and p-type silicon.

Original Article
https://doi.org/10.4322/2176-1523.20212340
Corrosion behavior of low carbon steel processed by ECAP in neutral and alkaline environment Jorgimara Oliveira Braga, Jefferson Fabricio Lins, Gabriel Pessoa de Castro, Helder Alves de Almeida Junior, Igor Cuzzuol dos Santos, Gustavo Henrique Sousa, Izabel Lima Criscuolo, Cláudio Marcio Santana, Ursula Cid Pereira Low carbon steels; SPD; ECAP; Corrosion.

Original Article
https://doi.org/10.4322/2176-1523.20212271
Application of signature waves on the study of vibrations generated by rock blasting Paulo José Costa Couceiro Júnior, Eraldo Florêncio da Silva Júnior Signature wave; Vibrations; Rock blasting.

Original Article
https://doi.org/10.4322/2176-1523.20212162
Evaluation of the recovery of titanium contained in the niobium ores from Catalão region Fernando Rodrigues da Cunha, André Carlos Silva Ilmenite; FeTi; Niobium; Titanium

Original Article
https://doi.org/10.4322/2176-1523.20212046
Porous structure obtained by anodizing niobium in NaOH Rafael Martins da Rocha, Leonardo Felix Scheffel, Carlos Leonardo Pandolfo Carone, Fernando Dal Pont Morisso, Sandra Raquel Kunst, Jane Zoppas Ferreira, Cláudia Trindade Oliveira Niobium; Anodizing; Porous oxide; Sparking.

Original Article
https://doi.org/10.4322/2176-1523.20212326
Influence of the purge gas in the prevention of hydrogen cracking in welded joints of API 5L X80 steel Roberta Adrielle Lima Vieira, Waldemir dos Passos Martins, Valdemar Silva Leal, Antonio Ernandes Macêdo Paiva Hydrogen cracking; Purge gas; Implant test; Acoustic Emission System.

Original Article
https://doi.org/10.4322/2176-1523.20212297
Optical microscopic analysis of a DIN 18MnCrSiMo6-4 bainitic steel austenitized and quenched with different coolants Cristiano José Turra, Pedro José de Castro, Antonio Figueiredo Silveira, Alexandre da Silva Rocha Bainitic steel; Bainite; Multiphase microstructure; Cooling

Original Article
https://doi.org/10.4322/2176-1523.20212398
Consortia and their barriers in the development of pre-competitive technologies in R&D projects: conceptual model and application Reinaldo Lopes Ferreira, Cristina Godoy, Eduardo Vasconcellos, Fernando Fernandez Pre-competitive R&D consortium; Barriers; Collaborative research.

Original Article
https://doi.org/10.4322/2176-1523.20212384
Polyvinyl chloride and cork composites: evaluation of thermal, flammability and morphology Pedro José Gomes Rodrigues, Lucas Rafael Carneiro da Silva, Arquimedes Lopes Nunes Filho, Renata Barbosa, Joyce Batista Azevedo, Tatianny Soares Alves PVC; Cork; Composites; Thermal behavior.

Original Article
https://doi.org/10.4322/2176-1523.20212348
Caracterização do defeito spalling e correlação com a região da solda aluminotérmica em trilho ferroviário Gregory de Oliveira Miranda, Vinicius Silva dos Reis, Carlos Vinicius de Paes Santos, Fábio Alves Rabelo Júnior, Edgar Costa Cardoso, José Maria do Vale Quaresma Defeitos em trilhos; Caracterização; Fadiga de contato de rolamento; Spalling.

Original Article
https://doi.org/10.4322/2176-1523.20212349
Hydrogen interaction in ultrafine grain duplex stainless steel 2205 aged after cold rolling Loyslene Rabelo Fernandes, Thaís Braga de Abreu, Lisa Claeys, Tom Depover, Kim Verbeken, Dagoberto Brandão Santos Duplex stainless steel; Hydrogen embrittlement; Hydrogen absorption; Hydrogen diffusivity; Brittle fracture

Original Article
https://doi.org/10.4322/2176-1523.20212382
Experimental analysis of the structural concrete with the addition of waste from the tire recovery process Priscila Marques Correa, Ruth Marlene Campomanes Santana Rubber; Environment; Waste; Construction

Original Article
https://doi.org/10.4322/2176-1523.20212336
Study of AISI 409 stainless steel formability under complex deformation routes Frederick Louis Dias de Morais, Elaine Carballo Siqueira Corrêa, Wellington Lopes AISI 409 steel; Shearing; Strain path.

Original Article
https://doi.org/10.4322/2176-1523.20212358
Synthesis of calcium phosphate biphasic ceramics by Pechini method José Rosa de Souza Farias, Geysivana Késsya Garcia Carvalho, Ycaro Breno Alves de Almeida, Josy Anteveli Osajima Furtini, Edson Cavalcanti Silva Filho, Aluska do Nascimento Simões Braga Hydroxyapatite; Tricalcium beta phosphate; Pechini.

Original Article
https://doi.org/10.4322/2176-1523.20212058
Electric and magnetic behavior of Ni-Zn ceramic Valesca Donizeti de Oliveira, Claudiney de Sales Pereira Mendonça, Manuel Ribeiro da Silva, Rero Marques Rubinger, Adhimar Flávio Oliveira, Vander Alkmin dos Santos Ribeiro Nickel-zinc ferrite; Magnetization saturation; Spinel.

Original Article
https://doi.org/10.4322/2176-1523.20212314
Influence of acetic acid concentration on pyrolenous liquor in niobio anodization Luã Tainachi Mueller, Keila Vieira Oliveira, Fernando Dal Pont Morisso, Sandra Raquel Kunst, Carlos Leonardo Pandolfo Carone, Cláudia Trindade Oliveira Anodization; Nióbium; Pyrolignous liquor.

Original Article
https://doi.org/10.4322/2176-1523.20212433
Evaluation of replacement of CaF2 for B2 O3 in desulfurizing synthetic slags in the secondary steelmaking process Jorge Luís Coleti, Felipe Fardin Grillo, Eduardo Junca, Rafael Giuga Borba de Mello, Denise Crocce Romano Espinosa , Jorge Alberto Soares Tenório Synthetic slag; Desulfurization; Boron oxide; Secondary refining.

Original Article
https://doi.org/10.4322/2176-1523.20212220
Use of parametric models for investment estimates applied to the primary and secondary crushing stages of iron ore Paulo César Salvador de Aguiar Júnior, Douglas Batista Mazzinghy, Carlos Esteves Teixeira, Fábio Paiva Crushing; Cost estimation; Regression; Principal component analysis; Linear Programming.

Original Article
https://doi.org/10.4322/2176-1523.20211822
Study of resistance to drainage in asfalic concrete against temperature variation and incorporation of copper mining residue Ricardo Bentes Kato Short-term aging; Copper mine tailing; Asphalt binders.

Original Article
https://doi.org/10.4322/2176-1523.20212317
Analysis of the applicability of the double layer technique for the stress relief in welded joints of microalloyed steels Leandro Macedo Cozza, Jorge Luis Braz Medeiros, Fabio Augusto Dornelles do Amaral, Luciano Volcanoglo Biehl, Sérgio da Silva Cava, Fábio Calcagno Riemke, Demostenes Ferreira Filho Welding; Hear treatment; Stress relief.

Original Article
https://doi.org/10.4322/2176-1523.20212316
Morphological and microstructural characterization of Al95Fe2 Cr2 Ti1 powders produced by two different gas atomizers Aylanna Priscila Marques de Araújo, Leandro Micheloti, Claudio Shyinti Kiminami, Claudemiro Bolfari, Volker Uhlenwinkel, Piter Gargarella Gas atomization; Rapid solidification; Al-based alloys; Physical and microstructural powder properties.

Original Article
https://doi.org/10.4322/2176-1523.20212520
Textile waste valorization in the construction industry Elen Machado de Oliveira, Elis Machado de Oliveira, Camila Machado de Oliveira, Alexandre Gonçalves Dal-Bó, Michael Peterson Coating mortar; Textile waste; Reinforcement material; Mechanical strength.

Original Article
https://doi.org/10.4322/2176-1523.20212363
Evaluation of CO2 laser nitretation parameters on maraging 18Ni steel (300) to improve oxidation resistance João Paulo Giacomelli, Filipe Estevão de Freitas, Adriano Gonçalves dos Reis, Aline Capella de Oliveira, Vanessa Ribeiro dos Santos, Danieli Aparecida Pereira Reis Maraging steel; Oxidation; Nitriding; CO2 laser

Original Article
https://doi.org/10.4322/2176-1523.20212123
Mechanical performance of heavy gauge press hardened steel modified with Nb and Mo additions on GMAW welded joints Tiago Führ, Diego Tolotti, Daniela Bertol, João Henrique Corrêa de Souza, Angélica Paola de Oliveira Lopes Presshardening steel; Hot stamping; Welding metallurgy; Alloy design

Original Article
https://doi.org/10.4322/2176-1523.20212512
Characterization of alluvial gold ore using the Falcon concentrator Arthur Andrade Ricardo, Rísia Magriotis Papini, Bruno Augusto Cabral Góes Gravitic concentration; Gold ore; Sluice concentrator; Falcon concentrator

Original Article
https://doi.org/10.4322/2176-1523.20212459
Waste from the industry of disposable plastic straws: influence of the alkaline treatment on the properties of concrete parts for interlocking pavements Elis Machado de Oliveira, Elen Machado de Oliveira, Camila Machado de Oliveira, Alexandre Gonçalves Dal-Bó, Michael Peterson Concrete; Reinforcement material; Straw shavings

Original Article
https://doi.org/10.4322/2176-1523.20211991
Comparison of the TIG and A-TIG welding process in a low carbon steel with molybdenum microadition Mônica Aline Magalhães Gurgel, Ailanderson José Magalhães Gurgel, Vinicius Aleixo Silvestre, Frank de Mello Liberato, Andersan dos Santos Paula Welding; TIG; A-TIG; Active Flux; Ultramicrohardness

Original Article
https://doi.org/10.4322/2176-1523.20212309
Economic feasibility study of a quarry mine under contractual risk in probabilistic approach Jorge Luiz Valença Mariz, Suelen Silva Rocha, Júlio César de Souza Quarry mining; Mineral economics; Economic feasibility; Risk analysis

Original Article
https://doi.org/10.4322/2176-1523.20212440
Effects of quenching heat treatments with intercritical austenitizing in the microstructure, elements partition and Ms temperature in a TRIP780 steel Natália Aparecida Barbosa Pimenta, Charles Henrique Xavier Morais Magalhães, Pablo Henrique Kelly Campos, Geraldo Lúcio de Faria Intercritical austenitizing; TRIP780 steel; Partitioning; Ms temperature.

Original Article
https://doi.org/10.4322/2176-1523.20212486
The effects of agglomeration time and burnt lime addition on the optimization of iron ore cold agglomeration process Jean Philippe Santos Gherardi de Alencar, Fernando Luiz Câmara Campos Júnior Iron ore; Sintering; Permeability; Agglomeration.

Original Article
https://doi.org/10.4322/2176-1523.20212425
Analysis of the influence of aging conditions on the mechanical strength and corrosion of UNS S31803 steel Cássia Barbosa Gomes, Elaine Carballo Siqueira Corrêa, Renata Braga Soares, Ricardo Adriano Dorledo de Faria, Vanessa Freitas de Cunha Lins, Wellington Lopes Duplex Stainless Steel, Sigma Phase, Corrosion Resistance.

Original Article
https://doi.org/10.4322/2176-1523.20212409
The impact of the emission trading scheme on the european steel industry and the future trends for technologies for obtaining primary iron Jean Philippe Santos Gherardi de Alencar, Wander Luiz Vasconcelos, Valdirene Gonzaga de Resende Greenhouse gases; Emissions; Ironmaking; Steelmaking.

Original Article
https://doi.org/10.4322/2176-1523.20212402
Numerical modeling of the continuous casting hollow billets heat transfer in industrial plant Edson Fouad Beck Filho, Paulo Jesus Aniceto, Noé Cheung, Carlos Henrique da Silva Santos, Felipe Bertelli Continuous casting; Numerical modeling; Finite difference method

Original Article
https://doi.org/10.4322/2176-1523.20212182
Experimental analysis of the effects of froth presence on iron ore slurry centrifugal pumping Reginaldo Amaro Ferreira, Aline Pereira Leite Nunes Slurry pumping; Froth pumping; Flotation; Iron ore

Original Article
https://doi.org/10.4322/2176-1523.20212055
Effect of zircon content and deformation on aging of the Al-Zr alloys Paulo Mendel Fernandes, Carlos Augusto Silva de Oliveira Al-Zr alloys; Deformation; Ageing; Precipitation.

Original Article
https://doi.org/10.4322/2176-1523.20212428
Regression modeling to predict ultrafine particles emission in a mineral plant combining meteorological and process variables Elisangela Krauss, Monica Lopes Aguiar Continuous dust analysers; Ultrafine particles; Regression model; Mineral fertilizer.

Original Article
https://doi.org/10.4322/2176-1523.20212472
A workflow for defining geological domains using machine learning and geostatistics Gabriel de Castro Moreira, Rudi César Comiotto Modena, João Felipe Coimbra Leite Costa, Diego Machado Marques Cluster analysis; Geostatistics; Mineral resources; Mining.

Original Article
https://doi.org/10.4322/2176-1523.20212367
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