铸钢表面钒铬铸渗层的微观分析及干滑动磨损性能研究  

Micro-Analysis of Casting Penetration Composite Layer with Vanadium and Chromium on the Surface of Cast Steel and Its Dry Sliding Wear Property

作　　者：杨涛林[1] 陈跃[1] 李晓宾[1] 

机构地区：[1]河南科技大学材料科学与工程学院

出　　处：《铸造》2008年第1期15-19,共5页Foundry

基　　金：国家自然科学基金重点项目(50432020);河南省杰出人才创新基金(0421000600)

摘　　要：采用消失模铸渗工艺在ZG310-570表面制备了钒铬表面复合层,并考察了其显微组织、增强相的结构、基体组织构成、显微硬度以及干滑动磨损性能。结果表明,钒碳化物为条状,铬碳化物为板条状。铸渗复合层中主要存在Cr7C3、V8C7、VC0.75、V2C四种硬质相。1000℃淬火后的铸渗层基体组织为马氏体加奥氏体和少量的贝氏体组织,马氏体包括板条马氏体和孪晶马氏体。在距铸渗层表面0～1mm处的显微硬度要低于距表面1～4mm的显微硬度,在过渡区显微硬度呈递减分布,在大于4.5mm以后的区域显微硬度趋于平稳。在450N载荷下,铸渗复合层的耐磨性为ZG310-570的13.6倍。The composite layer with vanadium and chromium on the surface of ZG310-570 was prepared by means of V-EPC casting penetration technology. Its microstructure, structure of reinforced phase, composition, microhardness and dry sliding wear resistance were studied. The results showed that, typical morphologies of vanadium carbide appear in the shape of strip, and chromium carbide appears as lath. The main reinforced phases are Cr7C3, V8C7, VC0.75, V2C in the composite layer. The matrix after quenching at 1 000℃ is lath martensite, twin martensite, austenite and bainite. The microhardness of the composite layer in the range of 0 to 1 millimeters from surface is lower than those in the range of 1 to 4 millimeters from surface. In the transition region the microhardness is degressive and tends to stable in the region of greater than 4.5 mmm. The resistance to wear is 13.6 times higher than that of ZG310-570 under the load of 450 N.

关 键 词：铸渗 钒铬复合层 显微组织 干滑动磨损 

分 类 号：TG174.445[金属学及工艺—金属表面处理]