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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。
The impact of post-weld heat treatment regime on the impact toughness of 610 MPa-class hydro-electric steel under different heat input was discussed. It was found that the heat input tended to be brittle near 620 ℃ at 30 kJ / cm. At 40 kJ / cm Significant reheat embrittlement at 580 ° C. The results of SEM, TEM and EDS show that the precipitation of carbides at the austenite grain boundaries is the cause of reheat embrittlement. Different welding heat input results in different dissolution rules of carbides during post-weld heat treatment, resulting in reheat embrittlement under 40 kJ / cm welding heat input compared with 30 kJ / cm reheating embrittlement under welding heat input to low temperature Move in the direction. Finally, according to the test results, 610 MPa hydropower steel after welding heat treatment process is optimized.