Effects of Tungsten and Heat Treatment on Microstructure and Hardness of 28 wt.%Cr High Chromium Cast Irons
Abstract
In this research, effect of tungsten and heat treatment on microstructure and hardness of 28 wt.%Cr high chromium iron with 1 wt.%W addition was studied. The as-cast samples were destabilised at 1025oC for 4 h and tempering at 450oC for 4 h. It was found that the as-cast microstructure of the iron without W addition consisted of primary austenite dendrite with eutectic M7C3 carbides. The iron with W addition consisted of primary and eutectic M7C3 carbides. After destabilisation, precipitation of secondary carbide within martensite matrix was occurred in both irons. Tempering increased the amount of secondary carbide. The as-cast hardness of the irons without and with W addition were 507 and 576 HV30. After destabilisation, the hardness increased up to 736 and 780 HV30. After tempering, the hardness were 743 และ 805 HV30. Keywords : high chromium cast iron, destabilisation, tempering, microstructure, hardnessReferences
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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., Chairuangsri, T., Brown, A., Brydson, R., Edmonds, D.V., and Pearce, J.T.H. (2005). Microstructural and crystallographical study of carbides in 30 wt.%Cr cast irons, Acta Materialia, 53, 4143-4154.
Yamamoto, K., Inthidech, S., Sasaguri, N. and Matsubara, Y. (2014). Influence of Mo and W on high temperature hardness of M7C3 carbide in high chromium white cast iron, Materials Transactions, 55 (4), 684-689.
Inthidech, S., Boonmak, K., Sricharoenchai, P., Sasaguri, N. and Matsubara, Y. (2010). Effect of repeated tempering on hardness and retained austenite of high chromium cast iron containing molybdenum, Materials Transactions, 51(7), 1264-1271.
Imurai, S., Thanachayanont, C., Pearce, J.T.H., Tsuda, K., and Chairuangsri, T. (2014). Effect of Mo on microstructure of as-cast 28 wt.%Cr-2.6 wt.%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 28 wt.%Cr-2.6 wt.%C-(0-10) wt.%W iron, Materials Characterization, 99, 52-60.
Ma, Y., Li, X., Liu, Y., Zhou, S. and Dang, X. (2013). Microstructure and properties of Ti-Nb-V-Mo-alloyed high chromium cast iron, Bulletin of Materials Science, 36(5), 839–844.
Maratray, F. and Poulalion, A. (1982). Austenite retention in high-chromium white irons, AFS Transactions, 90, 795-804.
Mosavi Anijden, S.H., Bahrami, A., Varahram, N., and Davamic, P. (2007). Effect of tungsten on erosion-corrosion behavior of high chromium white cast iron, Materials Science and Engineering, 454-455, 623-628.
Pearce, J.T.H. and Elwell, D.W.L. (1986). Duplex nature of eutectic carbides in heat treated 30% chromium cast iron, Journal of Materials Science Letters. 5, 1063-1064.
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., Chairuangsri, T., Brown, A., Brydson, R., Edmonds, D.V., and Pearce, J.T.H. (2005). Microstructural and crystallographical study of carbides in 30 wt.%Cr cast irons, Acta Materialia, 53, 4143-4154.
Yamamoto, K., Inthidech, S., Sasaguri, N. and Matsubara, Y. (2014). Influence of Mo and W on high temperature hardness of M7C3 carbide in high chromium white cast iron, Materials Transactions, 55 (4), 684-689.
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2017-09-21
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บทความวิจัยจากการประชุมวิชาการระดับชาติ"วิทยาศาสตร์วิจัย"ครั้งที่ 9
