Effects of mischmetal addition on phase transformation and as-cast microstructure characteristics of M2 high-speed steel
来源期刊：JOURNAL OF RARE EARTHS2013年第6期
论文作者：曲明贵 王振华 李慧 吕知清 孙淑华 傅万堂
文章页码：628 - 633
摘 要：The influence of mischmetal （Ce-La） addition on phase transformation and as-cast microstructure characteristics of M2 high-speed steel （HSS） was investigated using Thermo-Calc software,differential scanning calorimetry,X-ray diffractometry and scanning electron microscopy with energy dispersive spectrometry.The results showed that the measured phase transition points of M2 HSS were broadly consistent with the theoretical results.After mischmetal addition,the liquidus peak temperature,the peak temperature of the eutectic precipitation of M6C and MC were all increased,especially for the M6C which was affected significantly and increased about 31 ℃.The contents of Mo and V in the eutectic carbide decreased and that of Fe increased,while in the matrix,the Mo,V and Cr contents all increased slightly.Furthermore,the microstructure of as-cast dendrite and ledeburite were refined,the total eutectic carbide content decreased and distributed into a discontinuous network,the lamellar spacing of M2C was reduced and the lamellae became thinner.
曲明贵1，王振华1,2，李慧1，吕知清1,2，孙淑华3，傅万堂1
1. State Key Laboratory of Metastable Materials Science and Technology,College of Materials Science and Engineering,Yanshan University2. College of Mechanical Engineering,Yanshan University3. College of Sciences,Yanshan University
摘 要：The influence of mischmetal （Ce-La） addition on phase transformation and as-cast microstructure characteristics of M2 high-speed steel （HSS） was investigated using Thermo-Calc software,differential scanning calorimetry,X-ray diffractometry and scanning electron microscopy with energy dispersive spectrometry.The results showed that the measured phase transition points of M2 HSS were broadly consistent with the theoretical results.After mischmetal addition,the liquidus peak temperature,the peak temperature of the eutectic precipitation of M6C and MC were all increased,especially for the M6C which was affected significantly and increased about 31 ℃.The contents of Mo and V in the eutectic carbide decreased and that of Fe increased,while in the matrix,the Mo,V and Cr contents all increased slightly.Furthermore,the microstructure of as-cast dendrite and ledeburite were refined,the total eutectic carbide content decreased and distributed into a discontinuous network,the lamellar spacing of M2C was reduced and the lamellae became thinner.
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