本文用热处理方法对奥氏体和珠光体异种钢接头的碳迁移现象及其对接头组织和机械性能的影响进行了研究,认为:焊缝金属有析出物出现;熔合区形成一个增碳层;热影响区形成一个脱碳的铁素体带。随回火参数 P 值增加,焊缝析出物增多,晶界加厚;增碳层加宽;脱碳层铁素体晶粒长大;接头拉伸强度,弯曲角和梅氏冲击值均降低,但这种降低在一定温度(如490℃)下逐步达到饱和。 In this paper, the carbon migration phenomenon of austenite and pearlite dissimilar steel joints and their effects on the joint structure and mechanical properties were studied by means of heat treatment. The results show that there are precipitates in the weld metal, a carbon layer is formed in the fusion zone, The HAZ forms a decarburized ferrite band. With the increase of tempering parameter P, the precipitation of weld increased, the grain boundary became thicker, the carbon layer widened, the grain size of decarburized ferrite grew up, the tensile strength, bending angle and Mehs impact value decreased , But this reduction is gradually saturated at a certain temperature (eg 490 ° C).