【摘要】 用喷射成形法制造Ｃｒ１２ ＭｏＶ 钢－ 碳钢复合轧辊， 检验其表面沉积层显微组织， 以研究喷射成形工艺的影响。通过金相、透射电镜、电子探针和Ｘ 射线衍射等方法检查了Ｃｒ１２ ＭｏＶ 钢的组织特征。研究表明， 喷射成形Ｃｒ１２ ＭｏＶ 钢的显微组织与传统方法加工的不同。喷射成形材料的晶粒为均匀、细小的等轴晶， 平均粒度约为１８ μｍ ， 组织致密， 无宏观偏析。在马氏体基体上， 观察到相当数量的残余奥氏体。钢中碳化物的类型未变， 仍为Ｃｒ７Ｃ３ 碳化物， 但是， 它的形貌、尺寸和分布方式均发生变化， 致使显微组织的均匀程度明显提高更多还原

【Abstract】 A Cr 12 MoV steel carbon steel clad roll was prepared by spray forming. The microstructure of its surface layer was examined to investigate the effect of spray forming process. The structural characteristic of Cr 12 MoV steel surface layer was studied by OM, TEM, Electron probe and X ray diffractometer. The results showed that spray formed steel was found different from that prepared by conventional methods, i.e., it is of homogeneous, fine equiaxial crystal with average grain size of 18 μm, and it is very concentrated and no macro segregation; an equal sum of Austenite is remained on Martensite matrix; the carbide in steel was still Cr 7C 3, but its appearance, size and distribution are all changed, leading to the great improvement of microstructural homogeneity.更多还原