马秀萍,卜志强,李然,吴家云,李金富

• 1:中国航发南方工业有限公司
• 2:上海交通大学材料科学与工程学院金属基复合材料国家重点实验室

摘要(Abstract)：

Ti_2AlNb合金因其较高的比强度和高温抗氧化能力，是先进航空发动机热端部件的重要候选材料。但作为金属间化合物材料，其焊接性能是一重要挑战。为了解焊接热循环对合金组织性能的影响规律，使用Gleeble3500热模拟试验机模拟了Ti_2AlNb合金焊缝附近热影响区的热循环，研究了冷却速度对焊接热影响区组织与性能的影响；根据热膨胀-温度曲线，结合不同冷速下合金的显微组织，建立了Ti_2AlNb合金焊接热影响区连续冷却转变(SH-CCT)曲线。结果表明：在快速加热至B2单相区后的连续冷却过程中Ti_2AlNb合金中主要析出相为O相，α_2相的析出量很少。随着冷却速度的增加，析出相的数量逐渐减少、尺寸降低，且α_2相的析出率先被抑制，B2相向O相转变的温度区间缩小。冷却速度低，合金中析出相数量多，强度高，但塑性低。反之，随着冷速的增加，残留B2相增多，合金的塑性得到改善。

关键词(KeyWords)： Ti_2AlNb合金;热模拟;焊接热影响区;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项(2017-VI-0004-0075);; 企业科技项目(K19168)

作者(Author): 马秀萍,卜志强,李然,吴家云,李金富

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