摘要: |
针对GH4780与GH6783两种高温合金所组成的焊接接头进行电子束焊接试验,对接接头厚度为6.5mm加3.5mm锁底。测试结果表明:这两种合金所组成的对接接头,焊接性能良好,未出现焊接缺陷;接头室温、高温拉伸强度与高温持久性能介于两种母材各自性能之间,接头拉伸试验断裂位置均处于母材强度较弱的GH6783合金一侧;焊缝组织主要为胞状晶组织和树枝晶组织。 |
关键词: GH4780;GH6783;异种高温合金;电子束焊接;组织与性能 |
基金项目: |
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Properties and Microstructure of GH4780 and GH6783 Dissimilar Superalloy Electron Beam Welding Joints |
Gao Jianshi Yuan Hong Yu Huai Wang Jinxue Zhang Guodong
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Beijing Institute of Aeronautical Materials
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Abstract: |
For the welding joints which were combined with GH4780 and GH6783 dissimilar superalloys, this research did a series of tests of electron beam welding. Thickness of the welding joints is 6.5mm and the thickness of locking which is below the joints is 3.5mm. The test results show: weldability of the joints of the two dissimilar superalloys is basically well without obvious defect; tensile properties of the joints are basically between the properties of the two alloys. The sites of fracture are totally located in the side of GH6783 alloy which property is relatively weak. Microstructure of the welding joints is basically including cellular crystal and dendrite crystal. |
Key words: GH4780;GH6783;dissimilar superalloy;EBW;properties and microstructure |