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A New Approach for Refining carbide dimensions in M42 Super Hard High-speed Steel

Journal of Iron and Steel Research International 2016年第8期23卷 800-807页

作者： Xue-feng ZHOU Wang-long ZHU Hong-bing JIANG Feng FANG Yi-you TU Jian-qing JIANG Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and EngineeringSoutheast University Nanjing 211189 Jiangsu China Jiangsu Engineering Research Center of Tool and Die Steel Danyang 212312 Jiangsu China Nanjing University of Information Science and Technology Nanjing 210044 Jiangsu China

Obtaining small carbides is crucial but difficult for high-speed steels.A new approach for refining carbide dimensions in M42 super hard high-speed steel by increasing cooling rate and spheroidizing treatment was *** morphologies and properties of eutectic carbides formed at different cooling rates were investigated by means of scanning electron microscopy（SEM）,energy dispersive spectroscopy（EDS）,X-ray diffraction（XRD）,transmission electron microscopy（TEM）,electron back-scattered diffraction（EBSD）and differential scanning calorimeter（DSC）.The results show that eutectic carbides change from a lamellar shape into a curved-rod shape as cooling rate *** different morphologies,the two carbides are both of M2C type with a hexagonal close-packed structure and display a single crystal orientation in one eutectic *** morphology of M2C mainly depends on the growing process of eutectic carbides,which is strongly influenced by cooling *** with lamellar carbides,M2C carbides with curved-rod shapes are less stable,and decompose into M6 C and MC at lower *** are more inclined to spheroidize during heating,which ultimately and distinguishably refines the carbide *** small carbides are much easier to dissolve into matrices during austenization,the process described herein improves the supersaturation of alloying elements in martensite,which leads to an increment of hardness in M42 steel.

关键词： eutectic lamellar hexagonal carbide heating calorimeter curved dispersive dimensions decompose

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