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采用热模拟试验机Gleeble-3800模拟了S32003双相不锈钢不同焊接线能量下的焊接热循环,研究了模拟焊接热影响区的组织与性能。结果表明:随着焊接线能量的增加,焊接热影响区的铁素体体积分数逐渐由88.7%减少到了58.7%,铁素体和奥氏体两相组织越来越粗大,焊接热影响区的冲击功先增大后减小;随着测试温度的降低,热影响区的冲击功逐渐降低,低温冲击韧性随着线能量增加下降得更为显著。
The thermal cycle of welded joints of S32003 duplex stainless steel with different welding wire energy was simulated by Gleeble-3800, and the microstructure and properties of the simulated HAZ were studied. The results show that with the increase of welding wire energy, the volume fraction of ferrite in HAZ gradually decreases from 88.7% to 58.7%, and the two-phase structure of ferrite and austenite grows larger and larger. The heat-affected zone The impact energy first increases and then decreases. With the decrease of the test temperature, the impact energy of the heat-affected zone gradually decreases, and the impact toughness at low temperature decreases more as the line energy increases.