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为研究冷却速度对铝合金化TRIP钢焊缝熔合区的组织与硬度的作用,采用RSW、YAG、Diode和ARC等4种不同方式对铝合金化TRIP钢焊接。结果表明,铝合金化TRIP钢母材铁素体基体上分布着少量的黑色贝氏体以及部分白色的残余奥氏体。ARC、Diode、YAG和RSW等4种不同焊接方式焊缝冷却速度依次增加,低温组织铁素体含量逐渐减少。随着冷却速度的增加,熔合区的硬度、马氏体含量逐渐升高。
In order to study the effect of cooling rate on the microstructure and hardness of weld zone in the weld of TRIP steel, aluminum alloyed TRIP steel was welded by four different methods, RSW, YAG, Diode and ARC. The results show that a small amount of black bainite and a part of white residual austenite are distributed on the base metal ferritic matrix of aluminum alloyed TRIP steel. The welding speed of ARC, Diode, YAG and RSW increased with the increase of the cooling rate and the content of ferrite in the cold tissue decreased gradually. With the increase of cooling rate, the hardness and martensite content of fusion zone gradually increase.