Precipitation behaviors of carbides in M42 high speed steel during ESR and forging
LUO Yi-wa1,2,GUO Han-jie1,2,SUN Xiao-lin1,2,3
(1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083,China 2. Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, Beijing 100083,China 3. Institute for High-Temperature Materials, Central Iron and Steel Research Institute, Beijing 100081, China)
Abstract:The characteristics (type, size, distribution and precipitation conditions) of precipitates in M42 high speed steel under electroslag remelting (ESR) and forging were analyzed by X-ray diffraction (XRD),optical microscopy (OM), transmission electron microscopy (TEM), and thermodynamic calculation. The precipitates in the steel after ESR were mainly plate-shaped,fibrous and rod-like Mo2C metastable phase precipitating along the grain boundaryat a large sizeand Cr7C3 carbide. The precipitates in the steel after forging were mainly Cr7C3, VC and Fe2Mo4C,whoseaverage size wasless than 10μm. The precipitates existed as the shape of square,sphere and small particle.The Mo2C carbides in M42 high speed steeldecomposed into a mixture of Fe2Mo4C and VC during forging process. Thermodynamic calculation results reveal that Mo2C and VC precipitate in the solid-liquid zone at 1 229 and 1 222 ℃, respectively. Cr7C3 precipitates in the solid zone at 842 ℃.
罗乙娲,郭汉杰,孙晓林,. M42高速钢电渣重熔及锻造退火后碳化物的析出[J]. 钢铁, 2017, 52(7): 68-75.
LUO Yi-wa,,GUO Han-jie,,SUN Xiao-lin,,. Precipitation behaviors of carbides in M42 high speed steel during ESR and forging. Iron and Steel, 2017, 52(7): 68-75.
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