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- W2890388220 abstract "In this work, the effects of 1 wt.% tungsten addition and variation in tempering times on the microstructure and hardness of nominal 28 wt.%Cr high chromium irons were investigated. As-cast samples were destabilised at 1050 °C for 4 hours and then hardened by air cooling. Tempering after destabilisation was carried out at 450 °C for 2, 4 and 6 hours followed by air cooling. X-ray diffractometry, light microscopy and scanning electron microscopy were used to characterize the microstructures of the irons. The results show that the as-cast microstructure of the iron without W addition consisted of primary austenite dendrites with eutectic M 7 C 3 and eutectic austenite partially transformed to martensite. The iron with 1 wt.%W addition contained primary M 7 C 3 and eutectic M 7 C 3 in an austenite matrix. Destabilisation treatment of the austenite matrix in both irons allowed precipitation of secondary carbides and transformation to martensite during air cooling. Phase transformation of eutectic M 7 C 3 was also found in the iron with W addition. The formation of primary M 7 C 3 in the 1 wt.%W iron increased the as-cast macro-hardness from 500 (no W) to 576 HV 30 . Destabilisation increased the macro-hardness up to 736 (no W) and 780 HV 30 (1 wt.%W) since secondary carbide precipitation allowed austenite to transform to essentially martensitic matrices. At longer tempering times, the macro-hardness further increased up to about 820 HV 30 ." @default.
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- W2890388220 date "2018-09-01" @default.
- W2890388220 modified "2023-10-16" @default.
- W2890388220 title "Microstructure and Tempering Behaviour of 28Cr-2.5C-1W Cast Irons" @default.
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- W2890388220 doi "https://doi.org/10.4028/www.scientific.net/ssp.283.116" @default.
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