Effects of mischmetal addition on phase transformation and as-cast microstructure characteristics of M2 high-speed steel |
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| Authors: | QU Minggui WANG Zhenhua LI Hui LV Zhiqing SUN Shuhua FU Wantang |
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| Affiliation: | [1]State Key Laboratory of Metastable Materials Science and Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China [2]College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China [3]College of Sciences, Yanshan University, Qinhuangdao 066004, China |
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| Abstract: | 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 °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. |
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| Keywords: | M2 high-speed steel mischmetal phase transformation as-cast microstructure carbide rare earths |
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