讨论了焊后热处理制度对不同热输入下610 MPa级水电钢粗晶区冲击韧性的影响,发现热输入在30 kJ/cm时在620℃附近有脆化倾向;热输入在40 kJ/cm时在580℃出现显著再热脆化。SEM、TEM及能谱试验结果表明,碳化物在原奥氏体晶界析出是发生再热脆化的原因。焊接热输入不同导致碳化物在焊后热处理时溶解规律不同,从而造成了40 kJ/cm焊接热输入下发生再热脆化的温度较30 kJ/cm焊接热输入下再热脆化温度向低温方向移动。最终根据试验结果优化了610 MPa水电钢焊后热处理工艺。
Influence of post-weld heat treatment regime on impact toughness of coarse-grained heat affected zone（CGHAZ） of 610 MPa-grade hydroelectricity steel was investigated.The results indicate that 620 ℃ is ductile-brittle transition temperature for heat input of 30 kJ/cm,and when heat input is 40 kJ/cm,the ductile-brittle transition occurs at 580 ℃.The microstructure observation shows that precipitation of carbides at prior austenite grain boundary results in the ductile-brittle transition.The different heat input results in the different dissolution behavior of carbides during post-weld heat treatment.The reheat embitterment temperature moves to lower temperature for the higher input.The post-weld heat treatment regime of 610 MPa-grade hydroelectricity steel is optimized based on the experiment.
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