(上海鋼鐵研究所，上海 200940)
*(上海交通大學國家教育部高溫材料及高溫測試開放實驗室，上海200030)
摘 要: 用噴射成形法制造Cr12MoV鋼－碳鋼復合軋輥，檢驗其表面沉積層顯微組織，以研究噴射成形工藝的影響。通過金相、透射電鏡、電子探針和X射線衍射等方法檢查了Cr12MoV鋼的組織特征。研究表明，噴射成形Cr12MoV鋼的顯微組織與傳統(tǒng)方法加工的不同。噴射成形材料的晶粒為均勻、細小的等軸晶，平均粒度約為18 μm，組織致密，無宏觀偏析。在馬氏體基體上，觀察到相當數(shù)量的殘余奧氏體。鋼中碳化物的類型未變，仍為Cr7C3碳化物，但是，它的形貌、尺寸和分布方式均發(fā)生變化，致使顯微組織的均勻程度明顯提高。
關鍵字: 噴射成形 復合軋輥 沉積層 顯微組織
（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
