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利用焊接热模拟装置对3.5%Ni钢在不同焊接线能量下的热影响区组织模拟,并对模拟试样进行了不同温度的回火处理。通过对模拟试样的低温冲击,金相分析,维氏硬度测量,考察了焊接线能量和焊后热处理温度对国产、进口3.5%Ni钢热影响区性能的影响。结果表明:焊接热循环对3.5%Ni钢的低温冲击韧性,恶化金相组织结构有较大影响,随着线能量的增大,这种影响更加明显;焊后回火处理能改善3.5%Ni钢热影响区的金相组织结构,提高低温冲击韧性。
The heat-affected zone of 3.5% Ni steel under different welding line energies was simulated by the welding thermal simulator, and the tempering of the simulated samples was carried out at different temperatures. The effects of welding wire energy and post-weld heat treatment temperature on the properties of heat-affected zone of 3.5% Ni steel made in China and imported were investigated by means of low temperature impact, metallographic analysis and Vickers hardness test. The results show that the welding thermal cycle has a significant effect on the low temperature impact toughness and the deteriorated microstructure of 3.5% Ni steel, which is more obvious with the increase of the line energy. The post-weld tempering treatment can improve 3.5% Ni Steel heat affected zone metallographic structure, improve low temperature impact toughness.