Effect of Heat Treatment on Microstructure and Hardness of 28 wt.%Cr-1 wt.%Mo High Chromium Cast Iron
Abstract
In this research, effect of heat treatment on microstructure and hardness of 28 wt.%Cr-1 wt.%Mo high chromium cast iron has been studied. The iron was cast into sand mold and destabilised at 1025oC for 4 h and then air cooled. Tempering was done at 450oC for 2, 4, 6 h. Microstructural investigation was performed by XRD, LM and SEM. Vickers hardness was tested. It was found that the as-cast microstructure consisted of primary austenite dendrite with eutectic carbides including M7C3 and M6C. After destabilisation, precipitation of secondary carbide within martensite matrix and some of retained austenite were occurred. The hardness increased after destabilisation. Tempering increase the hardness due to the transformation of retained austenite to martensite, and more temper-carbide. Keywords : high chromium cast iron, destabilisation, tempering, microstructure, hardnessReferences
Imurai, S., Thanachayanont, C., Pearce, J.T.H., Tsuda, K. and Chairuangsri, T. (2014). Effect of Mo on microstructure of as-cast 28wt.%Cr-2.6wt.%C-(0-10)wt.%Mo irons. Materials Characterization, 90, 99-112.
Imurai, S., Thanachayanont, C., Pearce, J.T.H., Tsuda, K. and Chairuangsri, T. (2015). Effect of W on microstructure of as-cast 28wt.%Cr-2.6wt.%C-(0-10)wt.%Mo irons. Materials Characterization, 99, 52-60.
Pearce, J.T.H. and Thanaboonsombut, B. (1999). Technology and Metallurgy of Alloy Cast Iron. Bangkok: Thailand National Metal and Materials Technology Center, 9-26.
Maratray, F. and Poulalion, A. (1982). Austenite retention in high chromium white irons. AFS Transactions, 90, 82-7.
Scandian, C., Boher, C., Melloc, de J.D.B. and Rézaï-Ariab, F. (2009). Effect of molybdenum and chromium contents in sliding wear of high-chromium white cast iron: the relationship between microstructure and wear. Wear 267, 401-408.
Tabrett, C.P., Sare, I.R. and Ghomashchi, M.R. (1996). Microstructure–property relationships in high chromium cast iron alloys. International Materials Reviews, 41, 59-82.
Wiengmoon, A., Pearce, J.T.H. and Chairuangsri, T. (2011). Relationship between microstructure, hardness and corrosion resistance in 20wt.%Cr, 27wt.%Cr and 36wt.%Cr high chromium cast irons. Materials Chemistry and Physics, 125, 739–748.
Wiengmoon, A., Pearce, J.T.H. and Chairuangsri, T. (2012). Microstructure, hardness, corrosion and dry wear of 17wt.%Cr-3wt.%C-7wt.%Mo cast iron. HTM Journal of Heat Treatment and Materials, 67(2), 166-176.
Zhi, X., Xing, J.D., Gao, Y., Fu, H., Peng, J. and Xiao, B. (2008). Effect of titanium on the as-cast microstructure of hypereutectic high chromium cast iron. Materials Characterization, 59, 1211-1226.
Imurai, S., Thanachayanont, C., Pearce, J.T.H., Tsuda, K. and Chairuangsri, T. (2015). Effect of W on microstructure of as-cast 28wt.%Cr-2.6wt.%C-(0-10)wt.%Mo irons. Materials Characterization, 99, 52-60.
Pearce, J.T.H. and Thanaboonsombut, B. (1999). Technology and Metallurgy of Alloy Cast Iron. Bangkok: Thailand National Metal and Materials Technology Center, 9-26.
Maratray, F. and Poulalion, A. (1982). Austenite retention in high chromium white irons. AFS Transactions, 90, 82-7.
Scandian, C., Boher, C., Melloc, de J.D.B. and Rézaï-Ariab, F. (2009). Effect of molybdenum and chromium contents in sliding wear of high-chromium white cast iron: the relationship between microstructure and wear. Wear 267, 401-408.
Tabrett, C.P., Sare, I.R. and Ghomashchi, M.R. (1996). Microstructure–property relationships in high chromium cast iron alloys. International Materials Reviews, 41, 59-82.
Wiengmoon, A., Pearce, J.T.H. and Chairuangsri, T. (2011). Relationship between microstructure, hardness and corrosion resistance in 20wt.%Cr, 27wt.%Cr and 36wt.%Cr high chromium cast irons. Materials Chemistry and Physics, 125, 739–748.
Wiengmoon, A., Pearce, J.T.H. and Chairuangsri, T. (2012). Microstructure, hardness, corrosion and dry wear of 17wt.%Cr-3wt.%C-7wt.%Mo cast iron. HTM Journal of Heat Treatment and Materials, 67(2), 166-176.
Zhi, X., Xing, J.D., Gao, Y., Fu, H., Peng, J. and Xiao, B. (2008). Effect of titanium on the as-cast microstructure of hypereutectic high chromium cast iron. Materials Characterization, 59, 1211-1226.
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Published
2017-09-15
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บทความวิจัยจากการประชุมวิชาการระดับชาติ"วิทยาศาสตร์วิจัย"ครั้งที่ 9
