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

Jing Guo¹，Hong-wei Qu¹，Li-gang Liu¹，Yan-liang Sun¹，Yue Zhang²，Qing-xiang Yang¹

1. State Key Laboratory of Meta-stable Materials Science and Technology,Yanshan University2. School of Material Science and Engineering,University of Science and Technology Beijing

摘 要：A high speed steel（HSS） was studied for rollers in this work.The steel was quenched at 1150 C and tempered at 520 C.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.

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