Study on stable and meta-stable carbides in a high speed steel for rollers during tempering processes  

作　　者：Jing Guo Hong-wei Qu Li-gang Liu Yan-liang Sun Yue Zhang Qing-xiang Yang 

机构地区：[1]State Key Laboratory of Meta-stable Materials Science and Technology,Yanshan University [2]School of Material Science and Engineering,University of Science and Technology Beijing

出　　处：《International Journal of Minerals,Metallurgy and Materials》2013年第2期146-151,共6页矿物冶金与材料学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 51271163)

摘　　要：A high speed steel （HSS） was studied for rollers in this work. The steel was quenched at 1150℃ and tempered at 520℃. The phase structures of the steel were determined by X-ray diffraction （XRD）, and the hardness of specimens was measured. The volume fraction of carbides was counted by Image-Pro Plus software. The typical microstructures were observed by field emission scanning electron microscope （FESEM）. Stable and meta-stable carbides were deduced by removing the existing phases one by one in the Fe-C equilibrium calculation. It is found that the precipitated carbides are bulk-like MC, long stripe-like M2C, fishbone-like M6C, and daisy-like M7C3 during the tempering process. The stable carbides are MC and M6C, but the meta-stable ones are M2C, M7C3, and M3C.A high speed steel （HSS） was studied for rollers in this work. The steel was quenched at 1150℃ and tempered at 520℃. The phase structures of the steel were determined by X-ray diffraction （XRD）, and the hardness of specimens was measured. The volume fraction of carbides was counted by Image-Pro Plus software. The typical microstructures were observed by field emission scanning electron microscope （FESEM）. Stable and meta-stable carbides were deduced by removing the existing phases one by one in the Fe-C equilibrium calculation. It is found that the precipitated carbides are bulk-like MC, long stripe-like M2C, fishbone-like M6C, and daisy-like M7C3 during the tempering process. The stable carbides are MC and M6C, but the meta-stable ones are M2C, M7C3, and M3C.

关 键 词：high speed steel phase diagrams TEMPERING carbides 

分 类 号：TG162.6[金属学及工艺—热处理]