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对铝合金化TRIP钢开展焊接试验,研究了冷却速度对焊缝熔合区的组织和显微硬度的影响,结果表明,熔合区均含有骨骼状的铁素体(δ),熔合区冷却速度的变化没有改变铁素体为初生相的凝固特征,但会影响熔合区组织的相对含量以及尺寸,硬度则随着冷却速度的增大而增大,且与马氏体的理论硬度值的差值逐步减小。
The welding experiment of aluminum alloyed TRIP steel was carried out. The effect of cooling rate on the microstructure and microhardness of weld zone was studied. The results show that the fusion zone contains skeletal ferrite (δ), the cooling rate of fusion zone The change did not change the solidification characteristics of the ferrite as the primary phase, but it also affected the relative content and size of the microstructure in the fusion zone. The hardness increased with the increase of the cooling rate and the difference from the theoretical value of martensite Gradually reduce.