论文部分内容阅读
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.
The high 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.