(上海钢铁研究所，上海 200940)
*(上海交通大学国家教育部高温材料及高温测试开放实验室，上海200030)
摘 要: 用喷射成形法制造Cr12MoV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Cr12MoV钢的组织特征。研究表明，喷射成形Cr12MoV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。
关键字: 喷射成形 复合轧辊 沉积层 显微组织
（Shanghai Iron and Steel Research Institute, Shanghai 200940, P. R. China
*Open Laboratory of State Education Ministry for High Temperature Materials and Testing,
Shanghai Jiao Tong University, Shanghai 200030, P. R. China）
Abstract:A Cr12MoV 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 Cr12MoV 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 g rain size of 18μm, 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 Cr7C3, but its appearance, size and distribution are all changed, leading to the great improvement of microstructural homogeneity.
Key words: spray forming; clad roll; microstructure
