Effects of mischmetal addition on phase transformation and as-cast microstructure characteristics of M2 high-speed steel

被引:31
作者
Qu Minggui [1 ]
Wang Zhenhua [1 ,2 ]
Li Hui [1 ]
Lv Zhiqing [1 ,2 ]
Sun Shuhua [3 ]
Fu Wantang [1 ]
机构
[1] Yanshan Univ, Coll Mat Sci & Engn, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China
[2] Yanshan Univ, Coll Mech Engn, Qinhuangdao 066004, Peoples R China
[3] Yanshan Univ, Coll Sci, Qinhuangdao 066004, Peoples R China
基金
中国国家自然科学基金;
关键词
M2 high-speed steel; mischmetal; phase transformation; as-cast microstructure; carbide; rare earths; EUTECTIC CARBIDES; RARE-EARTH;
D O I
10.1016/S1002-0721(12)60332-9
中图分类号
O69 [应用化学];
学科分类号
081704 ;
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 degrees C. 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.
引用
收藏
页码:628 / 633
页数:6
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