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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(α+γ)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。
The welding thermal simulation technology, mechanical property test and microstructure analysis were used to study the microstructure and properties of the X100 pipeline steel after the secondary welding heat cycle. The results show that the toughness of the coarse grain zone of X100 pipeline steel is the best when the peak temperature of secondary heat cycle is 1000 ℃ in multipass welding. When the peak temperature of secondary heat cycle is in the range of (α + γ) Phase region, due to the partial recrystallization and tissue genetic phenomenon, is not conducive to X100 pipeline steel weld coarse grain toughness increases unevenly distributed in dendrites grain boundary large-size carbon-rich MA component is to cause its part The main reason for embrittlement.