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| ZTC4钛合金精铸件电子束焊接接头组织与疲劳行为研究 | |
| 引用本文： | 刘茜珂,刘昌奎,彭楚峰,郑春红,毛智勇.ZTC4钛合金精铸件电子束焊接接头组织与疲劳行为研究[J].失效分析与预防,2008,3(3):32-36. |
| 作者姓名： | 刘茜珂 刘昌奎 彭楚峰 郑春红 毛智勇 |
| 作者单位： | 1. 北京航空材料研究院,北京,100095 2. 中国人民解放军驻成飞公司军事代表室,成都,610092 3. 沈阳飞机设计研究所,沈阳,110035 4. 北京航空制造工程研究所,北京,100024 |
| 摘 要： | 在四种不同应力水平下对ZTC4钛合金精铸件进行了疲劳试验，研究了ZTC4钛合金精铸件电子束焊接接头组织、疲劳性能与疲劳断裂特征。结果表明，ZTC4钛合金精铸件基体显微组织为片层组织，电子束焊缝为晶粒内析出大量的细针状a’相的针状马氏体组织特征；焊缝硬度略高于基体；疲劳裂纹一般起源于焊缝熔合区表面或次表面微气孔，疲劳扩展初期断口表面存在类解理光滑刻面，并且疲劳条带呈脆性条带特征，而在疲劳扩展的中后期，转变为韧性疲劳条带特征；尺寸较大的表面、次表面焊接或冶金缺陷对焊接接头的疲劳性能有较大的影响。 |
| 关 键 词： | 钛合金精铸件 电子束焊接 疲劳 断裂 |
Study on Microstructure and Fatigue Behavior of Electron-beam Welding Joints of ZTC4 Titanium Alloy Investment Castings |
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| LIU Xi-ke,LIU Chang-kui,PENG Chu-feng,ZHENG Chun-hong,MAO Zhi-yong.Study on Microstructure and Fatigue Behavior of Electron-beam Welding Joints of ZTC4 Titanium Alloy Investment Castings[J].Failure Analysis and Prevention,2008,3(3):32-36. | |
| Authors: | LIU Xi-ke LIU Chang-kui PENG Chu-feng ZHENG Chun-hong MAO Zhi-yong |
| Affiliation: | LIU Xi-ke,LIU Chang-kui, PENG Chu-feng, ZHENG Chun-hong, MAO Zhi-yong (1. Beijing Institute of Aeronautical Materials, Beijing 100095, China; 2. Military Representative Office of PLA (CAC), Chengdu 610092, China; 3. Shenyang Aircraft Design Research Institute, Shenyang 110035, China; 4. Beijing Aerocraft Manufacture Technology Research Institute, Beijing 100024, China) |
| Abstract: | Fatigue tests of ZTC4 titanium alloy investment castings were carried out under different stress levels of 340MPa, 400MPa, 460MPa and 520MPa. The microstructure, fatigue properties and fracture features of the electron-beam welding joints were investigated. The results show that the microstructure of the base material is lamellar structure. The microstructure of the welding joints is acicular martensite and there is a lot of aciculate a＇ phase in the grains. The microhardness of the welding joints is higher than that of the base material. The fatigue cracks initiated from gas cavities in the surface or subsurface of the fusion zone. There are some slick facets and brittle fatigue striations near the fatigue source region of the fracture surface, and there are ductile fatigue striations at the extension and final fracture regions. The larger welding or casting defects in the surface or subsurface layer have greater effect on the fatigue properties of the welding joints. |
| Keywords: | ZTC4 alloy investment castings electron-beam welding fatigue fracture |
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