Microstructure and Properties of SIMP Steel Joint by Three Step Heating Transient Liquid Phase Diffusion Welding with Different Process Parameters
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摘要: 采用BNi2和Fe78Si9B13非晶合金箔作为中间层，对SIMP钢管进行三温工艺瞬时液相（TLP）扩散焊接，研究了不同等温凝固工艺参数（温度1 230，1 240℃；时间180，240 s；压力8，9 MPa）下接头的显微组织和力学性能。结果表明：等温凝固温度的升高或时间的延长均可以促进降熔元素的扩散，减少焊缝组织中脆硬相的生成，从而提高接头的抗拉强度、降低焊缝的显微硬度；较佳的等温凝固工艺参数为温度1 240℃、时间240 s、压力9 MPa，采用该参数焊接后接头组织为均匀马氏体，焊缝组织与两侧母材组织的差异很小，抗拉强度最高，为794 MPa，拉伸断裂方式为韧性断裂。
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关键词:
- SIMP钢 /
- 瞬时液相(TLP)扩散焊接 /
- 显微组织 /
- 力学性能
Abstract: With BNi2 and Fe78Si9B13 amorphous alloy foils as intermediate layer, SIMP steel tubes were joined by three step heating transient liquid phase (TLP) diffusion welding. Microstructure and mechanical properties of the joint welded with different isothermal solidification process parameters (temperature of 1 230, 1 240℃; time of 180, 240 s; pressure of 8, 9 MPa) were studied. The results show that increasing isothermal solidification temperature or time was beneficial to the diffusion of melting elements and reducing formation of brittle hard phases in the weld microstructure, thereby improving the tensile strength of the joint and reducing the microhardness of the weld. The relatively optimal isothermal solidification parameters were listed as follows:temperature of 1 240℃, time of 240 s, and pressure of 9 MPa. After welding with these parameters, the microstructure of the joint was composed of uniform martensite, and the difference between the weld microstructure and the base metal microstructure was small; the tensile strength of the joint reached the largest value of 794 MPa, and the tensile fracture mode was ductile fracture. -
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