成分调控对BT20钛合金焊接接头疲劳性能的影响
Effect of Component Control on Fatigue Properties of Welded Joints of Titanium Alloy BT20
葛敬鲁1,2, 张 钧1, 刘建荣2, 李晋炜3
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作者单位:1.沈阳大学,辽宁 沈阳 110044;2.中国科学院金属研究所,辽宁 沈阳 110016;3.北京航空制造工程研究所,北京100024
中文关键字:BT20钛合金; 电子束焊接; 成分调控; 疲劳性能
英文关键字:BT20; EBW; component control; fatigue properties
中文摘要:通过在BT20钛合金电子束焊接过程中添加嵌料,改变接头熔合区的化学成分,研究成分的变化对其焊接接头焊缝区显微组织、显微硬度以及高周疲劳性能的影响。结果发现,成分调控在降低接头熔合区合金化程度的同时,还改变了熔合区的显微硬度分布。高周疲劳测试结果表明,成分调控BT20合金焊接接头的疲劳强度与传统焊接接头相当,比基体高;但是在780 MPa的高应力水平下,疲劳寿命随疲劳峰值应力的增加迅速降低,样品在焊缝区断裂的几率增加,表明成分调控会降低焊接接头高应力水平下的疲劳性能。
英文摘要: The effects of component control on the microstructure, rigidity and high cyclic fatigue properties of weldment of titanium alloy BT20 alloy were investigated. The results show that not only the alloying degrees on BT20 fusion area but also the micro-rigiditys decreases with the component control. The fatigue life increases with the decrease of fatigue peak value. The component control fatigue strength of BT20 is equal with traditional welded joint. But on the level of 780 MPa, the rupture probability of specimens in weld area is increased, which show that the component control can affect the fatigue performance of weldment at high stress.