A New Approach for Refining Carbide Dimensions in M42 Super Hard High-speed Steel

作     者：Xue-feng ZHOU Wang-long ZHU Hong-bing JIANG Feng FANG Yi-you TU Jian-qing JIANG 无

作者机构：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 TechnologyNanjing 210044 Jiangsu China 

出 版 物：《Journal of Iron and Steel Research International》 (J. Iron Steel Res. Int.)

年 卷 期：2016年第23卷第8期

页      面：800-807页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Item Sponsored by National Natural Science Foundation of China(51301038,51201031,51371050) Industry-Academia-Research Program of Jiangsu Province of China(BY2014127-03) Natural Science Foundation of Jiangsu Province of China(BK20141306) Jiangsu Province Key Laboratory of High-end Structural Materials of China(hsm1404) 

主　　题：eutectic lamellar hexagonal carbide heating calorimeter curved dispersive dimensions decompose 

摘      要：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.