张凯锋,曲凤盛,王长瑞

• 1:哈尔滨工业大学金属精密热加工国家级重点实验室

摘要(Abstract)：

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。

关键词(KeyWords)： GH4169合金;激光焊接;显微组织;超塑成形

Abstract:

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基金项目(Foundation):

作者(Author): 张凯锋,曲凤盛,王长瑞

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