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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。
Three types of transition layer materials, RMD136, RMD535 and RMD142, were used to compare and optimize the microstructure and properties of the transition layer. The results show that the two materials before the welding on the surface of low alloyed cast steel can effectively prevent the formation of decarburized layer and carbon layer and the formation of a large amount of carbides in the vicinity of the fusion line and weaken the tendency of cracking and help to ensure the uniform transition of the microstructure and properties . Transition layer RMD136 and RMD535 are low-carbon martensitic steel, low-carbon martensite good crack resistance, moderate hardness, good ductility, can withstand moderate impact; linear expansion coefficient is smaller, the tendency of cracking and deformation is small, High-strength surfacing material of the transition layer material; which uses RMD136 transitional layer surfacing the best mechanical properties, to achieve low-alloy cast steel, transitional layer and the coating between the high-strength connection.