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系统研究了粗晶区在不同焊接热过程中的韧性分布特征和控制韧性的显微组织因素．基于示波冲击试验提供的动态断裂信息，提出了几种新的评定管线钢韧脆转变温度的准则．
The toughness distribution characteristics and the toughness control microstructure factors of the coarse grained region in different welding processes were systematically studied. Based on the dynamic fracture information provided by the oscillometric impact test, several new criteria for evaluating ductile-brittle transition temperature of pipeline steel are proposed.