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中文摘要：
采用焊接热模拟技术、力学性能测试和显微组织分析等手段,研究了X100管线钢焊缝粗晶区受到二次焊接热循环作用后的组织与性能变化情况。结果表明在多道焊中,当二次焊接热循环峰值温度为1000℃时,X100管线钢焊缝粗晶区的韧性最佳;当二次焊接热循环峰值温度在（琢＋酌）两相区内时,由于发生了部分重结晶和组织遗传现象,不利于X100管线钢焊缝粗晶区韧性的提高,不均匀分布在树枝晶晶界的大尺寸富碳M-A组元是导致其局部脆化的主要原因。
英文摘要：
The microstructure and properties of X100 pipeline steel weld-coarse-grained heated in different second peak temperature were studied by thermal simulation technique, impact test and microscopic analysis method. The results show that the toughness is best when second peak temperature reaches 1000℃ during the multi-pass welding; in two phase region（α＋γ）in the second process of welding thermal cycle, the partial recrystallization and microstructure genetic phenomenon appear,which is not conducive to the improvement of toughness. The main reason for embrittlement is the large size of carbon-rich M-A, which is not in uniform distribution.
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