Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/2176-1523.20202325
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

SELECTED DEVELOPMENTS IN NB-MICROALLOYED FORGINGS FOR INDUCTION HARDENING, AND PEARLITIC WIRE ROD

John Speer, Blake Whitley, Stephanie Kaster, Kip Findley, David Matlock, Emmanuel De Moor

Downloads: 0
Views: 129

Resumo

Niobium-microalloying technology has been increasingly applied in a wide range of steel applications over the past half-century to enhance properties; namely to increase strength, control microstructure, and enable a variety of applications. To achieve desired performance levels, thermomechanically processed microalloyed steels are widely supplied by the steel industry for high volume applications in hot-rolled plate, sheet and structural steels. However, in steel long products and forgings, the final properties are often generated by downstream users, after heat-treatment, surface hardening, forging or wire drawing. Two examples are presented highlighting advancements associated with Nb-microalloying to enhance microstructures and properties developed during thermomechanical and/or downstream processing. In the first example, a 0.02 wt. pct. Nb addition was made to a medium-carbon bar steel intended for induction-hardening applications requiring fatigue and fracture resistance in bending and torsion. The Nb addition as well as thermomechanical bar processing led to beneficial refinement of both the pre-induction and post-induction microstructures. In the second example, a 0.01 wt. pct. Nb addition to a high-carbon wire rod was found to refine the pearlite interlamellar spacing, and increase the hardness.

Palavras-chave

Niobium; Forgings; Induction; Wire rod; Microalloyed.

Referências

1 Matlock DK, Speer JG. Microalloying concepts and application in long products. Materials Science and Technology. 2009;25(9):1118-1125.

2 Matlock DK, Alogab KA, Richards MD, Speer JG. Surface processing to improve the fatigue resistance of advanced bar steels for automotive applications. Materials Research. 2005;8(4):453-459.

3 Matlock DK, Krauss G, Speer JG. New microalloyed steel applications for the automotive sector. Materials Science Forum. 2005;500-501:87-96. http://dx.doi.org/10.4028/www.scientific.net/MSF.500-501.87.

4 Alogab KA, Matlock DK, Speer JG, Kleebe HJ. The influence of niobium microalloying on austenite grain coarsening behavior of Ti-modified SAE 8620 steel. ISIJ International. 2007;47(2):307-316.

5 Enloe CM, Findley KO, Speer JG. Austenite grain growth and precipitate evolution in a carburizing steel with combined niobium and molybdenum additions. Metallurgical and Materials Transactions A, Physical Metallurgy and Materials Science. 2015;46(11):5308-5328.

6 Thompson RE, Matlock DK, Speer JG. The fatigue performance of high temperature vacuum carburized Nb modified 8620 steel. SAE Transactions. 2007;116:392-407.

7 López B, Pereda B, Bastos F, Rebellato M, Rodriguez-Ibabe JM. Challenges of Nb application in thermomechanical processes of steels for long products. Materials Science Forum. 2018;941:386-393.

8 Hayashi T, Kurosawa N, Yamada K. Method of prior austenite grain refining using induction hardening. Japan: JFE Steel Corporation; 2010. p. 4-9. (JFE Technical Report; no. 15) [cited 2020 May 4]. Available at: www.jfe-steel.co.jp/en/research/report/015/pdf/015-03-2.pdf

9 Whitley B. Thermomechanical processing of microalloyed bar steels for induction hardened components [thesis]. Golden: Colorado School of Mines; 2017.

10 Whitley BM, Easter CT, Cryderman RL, Speer JG. Thermomechanical simulation and microstructural analysis of microalloyed medium carbon bar steels. In: Proceedings of the International Symposium on Advances in Metallurgy of Long and Forged Products; 2015; Vail, Colorado. Warrendale: AIST;2015. p. 48-58.

11 Whitley BM, Speer JG, Cryderman RL, Goldstein RC, Findley KO, Matlock DK. Effects of microalloy additions and thermomechanical processing on austenite grain size control in induction-hardenable medium carbon steel bar rolling. Materials Science Forum. 2016;879:2094-2099.

12 Cryderman R, Whitley B, Speer J. Microstructural evolution in microalloyed steels with high-speed thermomechanical bar and rod rolling. In: Proceedings of 23rd IFHTSE Congress; 2016; Savannah, USA. Materials Park: ASM International; 2016. p. 181-187.

13 Cryderman RL, Speer JG. Microstructure and notched fracture resistance of 0.56% C steels simulated induction hardening. In: Proceedings of the 29th Heat Treating Society Conference; 2017; Columbus, Ohio. Materials Park: ASM International; 2017. p. 226-233.

14 Jansto SG. MicroNiobium alloy approach in medium and high carbon steel bar, plate and sheet products. Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science. 2014;45:438-444.

15 Jansto SG. Niobium-bearing construction steels and global application trends. In: Proceedings of the Value-Added Niobium Microalloyed Construction Steels Symposium; 2015; Singapore. Warrendale: CBMM, TMS; 2015. p. 91-113.

16 Mi YF, Cao JC, Zhang ZY, Qi HQ, Zhou XL, Yong QL. Effect of carbon content on the solubility of niobium carbide in austenite. Iron and Steel. 2012;47(3):84-88.

17 Miller S. Effect of microalloying on the strength of high carbon wire steels [thesis]. Golden: Colorado School of Mines; 2012.

18 Miller S. Effect of microalloying on pearlite transformation of high carbon wire steels [thesis]. Golden: Colorado School of Mines; 2015.

19 De Moor E, Miller SL, Van Raemdonck W. Microalloyed high carbon wire steels. In: Proceedings of the TMS 2014: 143rd Annual Meeting & Exhibition; 2014; San Diego, California. Cham: Springer; 2014. p. 935-942.

20 Miller SL, De Moor E. Influence of Nb additions on microstructural evolution of a V-microalloyed high-carbon wire steel during patenting. Journal of The Minerals, Metals & Materials Society. 2014;66(8):1471-1478.

21 Miller SL, De Moor E, Eavenson G. Thermomechanical processing simulation of mill deformation of high carbon wire rod. In: AISTech 2014 Proceedings; 2014; Indianapolis. Warrendale: AIST; 2014. p. 2735-2742.

22 De Moor E, Miller SL. Effects of niobium additions to a vanadium microalloyed high carbon wire steel. Wire Journal International. 2014;47:69-72.

23 Miller SL, De Moor E. Vanadium and niobium microalloying to increase strength of high-carbon wire steels. In: Proceedings of the 83rd Annual Convention of the Wire Association International Interwire Trade Exposition; 2013 Apr 22-25; Atlanta, Georgia. Guilford: WAI; 2013. p. 1-13.


Submetido em:
30/03/2020

Aceito em:
15/04/2020

5ed8fc7d0e8825b8683ed397 tmm Articles
Links & Downloads

Tecnol. Metal. Mater. Min.

Share this page
Page Sections