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采用金相显微镜和透射电镜对油罐钢焊接热影响区的显微组织进行了研究。结果表明:粗晶区组织主要由粒状贝氏体和板条贝氏体组成,并存在一定数量的M-A岛;细晶区主要为块状和多边形铁素体组织。
The microstructure of HAZ of oil tank steel was studied by metallographic microscope and transmission electron microscope. The results show that the coarse grain structure mainly consists of granular bainite and lath bainite, and a certain number of M-A islands exist. The fine grain regions are mainly massive and polygonal ferrite.