Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/tmm.00402002
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

ESTUDO DO PERFIL DE CARBONO NA CAMADA NITRETADA DO AÇO AISI M2

A STUDY OF CARBON PROFILE IN THE NITRIDED LAYER OF AISI M2 STEEL

Tier, Marco Antônio D.; Kieckow, Flávio; Strohaecker, Telmo Roberto; Rocha, Alexandre da Silva; Santos, Jorge Fernandez dos; Bell, Thomas

Downloads: 0
Views: 992

Resumo

O principal objetivo deste trabalho é investigar a redistribuição do carbono que normalmente se observa após a nitretação a plasma de aços. Amostras do aço AISI M2 foram nitretadas em um reator a plasma com 60 kW, variando-se temperatura, tempo e composição do gás de tratamento. Foram realizadas análises de difração de raios X, espectroscopia de emissão óptica em descarga incandescente – GDOS e microscopia óptica e eletrônica de varredura. De acordo com as análises GDOS, as amostras nitretadas apresentaram descarbonetação na superfície da camada nitretada, e enriquecimento de carbono na região de interface da camada com o substrato. Para algumas condições de tratamento, foi observada a existência de um pequeno pico de carbono na interface entre a camada de compostos e a zona de difusão. Os resultados obtidos sugerem que a camada de compostos atue como uma barreira para a descarbonetação. Observa-se que, em amostras com camada de compostos bem definidas, o nível de descar bonetação foi baixo resultando em uma significativa precipitação de carbetos em contornos de grão.

Palavras-chave

Nitretação a plasma, Camada nitretada, Descarbonetação

Abstract

The aim of this work is to investigate the redistribution of carbon normally observed after plasma nitriding of steels. Samples of AISI M2 steel were plasma nitrided in a 60 kW reactor varying temperature, time, and treatment gas composition. X-ray diffraction, glow discharge optical spectroscopy – GDOS, optical and scanning electron microscopy analysis were performed. According to GDOS analysis, the samples presented decarburization on the surface of the nitrided layer and a carbon enrichment zone in the interface layer-substrate. For some conditions of treatment, it was observed the presence of a small peak of carbon in the interface between the compound layer and the diffusion zone. The results suggest that the compound layer works as a barrier for the decarburization process. It was observed that for samples with a compact compound layer, the level of decarburization was low which resulted in a high level of carbides precipitation in the grain boundaries.

Keywords

Plasma nitriding, Nitrided layer, Decarburization

Referências



1 GENEL, K.; DEMIRKOL, M.; ÇAPA. M. Effect of ion nitriding on fatigue behaviour of 4140 steel. Materials Science and Engineering A, v. 279, n.1-2, p. 207-16, Feb. 2000.

2 GENEL, K.; DEMIRKOL, M.; GÜMEZ, T. Corrosion fatigue behaviour of ion nitrided AISI 4140 steel, Materials Science and Engineering A, v. 288, n.1, p. 91-100, Aug. 2000.

3 CASTRO, G.; FERNÁNDEZ-VICENTE, A.; CID, J. Influence of the nitriding time in the wear behaviour of an AISI H13 steel during a crankshaft forging process. Wear, v. 263, n. 7-12, p. 1375-85, Sept. 2007.

4 PESSIN, M.;TIER, M.; BLOYCE, A.; STROHECKER, T.; BELL, T.; SUN, Y. The effects of plasma nitriding process parameters on the wear characteristics of AISI M2 tool steel. Tribology Letters, v. 8, n. 4, p. 223-8, May 2000.

5 UMA DEVI, M.; CHAKRABORTY, T.K.; MOHANTY, O.N. Wear behaviour of plasma nitrided tool steel. Surface and Coatings Technology, 116-119, p. 212-21, Sept. 1999.

6 TIER, M.; BLOYCE, A.; BELL, T.; STROHAECKER, T. Wear of plasma nitrided high speed steel. Surface Engineering, v. 14, n. 13, p. 223-7, 1998.

7 TIER, M.; PESSIN, M.; STROHAECKER, T.; BELL, T. Mecanismos de desgaste do aço rápido AISI M2 nitretado a plasma. In: SEMINÁRIO DE DESGASTE, 4., 1998, São Paulo. Anais… São Paulo: ABM, 1998. p. 443-58.

8 BELL, T.; SUN, Y. Nitriding of austenitic stainless steel for combined improvement in wear and corrosion resistance. In: INTERNATIONAL CONFERENCE ON SURFACE SCIENCE AND ENGINEERING, 1995, Beijing, China. Beijing: International Academic Publishers., 1995. p 9-14.

9 HE, Y.; APACHITEI, I.; ZHOU, J.; WALSTOCK, T.; DUSZCZYK, J. The influence of the depth of a plasma nitrided layer in tool-steel substrate on the scratch-resistant properties of PACVD TiBN coating. Surface and Coatings Technology, v. 201, n.16-7, p. 7036-42, May 2007.

10 MA, S.; LI, Y.; XU, K. The composite of nitrided steel of H13 and TiN Coatings by plasma duplex treatment and the effect of pre-nitriding. Surface and Coatings Technology, v. 137, n. 2-3, p. 116-21, March 2001.

11 PANJAN, P.; Urankar, I.; Navinšek, B.; Terčelj, M.; Turk, R.; Čekada, M.; Leskovšek, V. Improvement of hot forging tools with duplex treatment. Surface and Coatings Technology, v. 151-2, p. 505-9, March 2002.

12 BELL, T.; DONG, H.; SUN, Y. Realising of potential of duplex surface engineering. Tribology International, v. 31, n. 1-3, p. 127-37, Jan.1998.

13 ZLATANOVIC, M. Deposition of (Ti,Al)N coatings on plasma nitrided steel. Surface and Coatings Technology, v. 48, n.1, p. 19-24, Oct. 1991.

14 GREDIC, T.; ZLATANOVIC, M.; POPOVIC, N.; BAGDAVOV, Z. Effect of plasma nitriding on the properties of (Ti, Al) N coatings deposited onto hot worked steel substrates. Thin Solid Films, v. 228, n. 1-2, p. 261-6, May 1993.

15 KWIETNIEWSKI, C. et all. Nitrided layer embrittlement due to edge effect on duplex treated AISI M2 high-speed steel. Surface and Coatings Technology v. 179, n. 1, p. 27-32, Feb. 2004.

16 TREJO-LUNA, R. et al. Some features of low temperature ion nitriding of steels. Scripta Metallurgica, v. 23, n. 9, p. 1493-6, Sept. 1989.

17 BEER, P.; Rudnicki, J.; Bugliosi, S.; Sokołowska, A.; Wnukowski, E. Low temperature ion nitriding of cutting knives made of HSS. Surface and Coatings Technology, v. 200, n. 1-4, p. 146-8, Oct. 2005.

18 TIER, M.; SANTOS, A.V.; KUHNEN, C.A.; BELL, T.; STROHAECKER, T. A study about grain boundary precipitation after plasma nitriding of steel. Surface Modification Technologies, p. 225-31, 2002.

19 HAGMANN, M. Plasma decarburisation and plasma nitriding of low alloy steel. Mphil, School of Metallurgy and Materials, The University of Birmingham, (1994).

20 ROCHA A.S.; STROHAECKER, T.; TOMALA, V.; HIRSCH, T. Microstructure and residual stresses of a plasma-nitrided M2 tool steel. Surface and Coatings Technology, v. 115, n. 1, p. 24-31, June 1999.

21 EGERT, P.; MALISKA, A.M.; SILVA, H.R.T.; SPELLER, C.V. Decarburization during plasma nitriding. Surface and Coatings Technology, v. 122, n. 1, p. 33-8, Dec. 1999.

22 ZLATANOVIC, M.; MÜNZ, W.D. Wear resistance of plasma-nitrided and sputter-ion-plated hobs. Surface and Coatings Technology, v.41, n.1, p.17-30, Feb. 1990.

23 MIDHA, S.; JACK, D.H. Characterization of 3% chromium steel. Metals Science v. 16, p. 398-404, 1982.

24 EDENHOFER, B. Production and structure of highly ductile plasma nitrided layers without a white layer. In: HEAT TREATMENT ‘79., 1979, Birmigham. Birmigham: The Metal Society, 1979.
588696c87f8c9dd9008b46c6 1573492069 Articles
Links & Downloads

Tecnol. Metal. Mater. Min.

Share this page
Page Sections