某低合金铸钢堆焊过渡层材料的优化选择  

Optimization Selection of Overlaying Transition Layer Material of Low-alloy Casting Steel

作　　者：毕欢[1] 周杰[1] 黄亮[1] 刘阳[1] 卢顺[1] 丁永峰[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400030

出　　处：《热加工工艺》2012年第23期168-169,173,共3页Hot Working Technology

摘　　要：选用3种过渡层材料RMD136、RMD535和RMD142进行过渡层组织和性能的对比和优化。结果表明,在低合金铸钢表面堆焊前两种材料,能有效避免脱碳层和增碳层出现以及熔合线附近大量碳化物的形成,减弱其开裂倾向,有利于保证组织和性能均匀过渡。过渡层RMD136和RMD535为低碳马氏体钢,低碳马氏体抗裂性好,硬度适中,延性好,能承受中度冲击;线胀系数较小,开裂和变形倾向较小,可作为高强度堆焊材料的过渡层材料;其中采用RMD136过渡层堆焊的力学性能最佳,实现了低合金铸钢、过渡层和覆层之间的高强度连接。Using RMD136, RMD535 and RMD142 material as overlaying transition layer, the microstructure and properties of the layer was compared and optimized. The results show that overlaying RMD136 and RMD535 on low alloy cast steel surface can effectively avoid the formation of decarburized layer and carburized carbon layer and the fusion of a large number of carbides near the line, weaken its cracking tendency, ensuring the uniform microstructure and properties transition; transition layer RMD136 and RMD535 is low-carbon martensitic steel, which has better crack resistance, moderate hardness, ductility, can withstand moderate impact; the coefficient of linear expansion of the above two layers is small, and the tendency of crack and deformation is small, which can be used as the transition layer of the surfacing materials with high strength; the mechanical property of low alloy cast steel overlaying RMD136 transition layer is best, which can confirm the high strength connection among the low alloy cast alloy, the transition layer and cladding.

关 键 词：低合金钢铸钢 热影响区 显微组织 力学性能 

分 类 号：TG455[金属学及工艺—焊接]