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采用激光连接/超塑成形组合技术制造了GH4169合金三层板结构件,研究了超塑成形(温度965℃,成形时间130min)对GH4169高温合金激光焊接组织的影响。试验结果表明:GH4169高温合金激光焊接组织主要由树枝晶构成,枝晶间中有Nb元素偏聚现象,即形成了一种金属间化合物Laves相;焊接组织在超塑成形后,焊缝中心出现了粗大的等轴晶粒,熔合线附近的柱状晶粒变得粗大,成形后大部分Laves相转变为δ相,但仍有少部分Laves相保留了下来;成形后焊缝的维氏硬度明显提高,由成形前的331.63HV0.1提高到391.74HV0.1,接近成形后母材的硬度415.63。超塑成形对GH4169高温合金激光焊接组织有明显的改善作用。
The structure of GH4169 alloy three-layer plate was fabricated by laser joining / superplastic forming technique. The effect of superplastic forming (temperature 965 ℃, forming time 130min) on the laser welding microstructure of GH4169 superalloy was studied. The experimental results show that the laser welding structure of GH4169 superalloy mainly consists of dendrites with the segregation of Nb in the interdendrites, which forms an intermetallic Laves phase. After the superplastic forming, the weld center appears The coarse equiaxed grains and the columnar grains near the weld line became coarse. Most of the Laves phase transformed to δ phase after forming, but a few Laves phase remained. After forming, the Vickers hardness of the weld was obvious Increased from 331.63HV0.1 before forming to 391.74HV0.1, and the hardness of the base metal after forming was close to 415.63. Superplastic forming on GH4169 superalloy laser welding organization has a significant improvement.