光束偏移量对DD407/GH1140激光焊接头性能的影响
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摘要
对航空发动机整体叶盘所采用的DD407和GH1140异种材料进行了激光对接试验,分析了光束偏移对接头力学性能的影响及典型接头横截面的组织特征,并分析了光束偏移对焊缝微观硬度影响。结果表明,该异种材料激光焊接头强度可达到466.3MPa,且光束偏移量对接头强度影响不大,主要取决于GH1140母材;焊缝横截面呈典型的"酒杯状",主要由焊缝两侧的枝状晶及中心的等轴晶组成;接头的显微硬度从GH1140侧经焊缝到DD407侧呈逐渐递增趋势,W和Co元素的固溶强化、γ'强化相的含量的增加、晶粒粗化是显微硬度上升的原因。
Laser butt welding of DD407 and GH1140 commonly used for aeroengine blisk was conducted.The effects of beam displacement on mechanical properties,microstructure characteristics,and microhardness of the laser joints were analyzed.The results show that the tensile strength of the joint reaches 466.3MPa,which is almost not affected by beam displacements,while determined by the performance of base metal GH1140.The morphology of joint cross section is"wine-cup shaped",and the microstructure of the weld mainly consists of dendritic grains of both sides of the weld and equiaxed grains in the weld centre.The distribution of micro-hardness gradually increases from the base metal of GH1140 to the weld and to the base metal of DD407 in different laser beam displacements,which results from the solution strengthening of W and Co elements,the increased content ofγ'strengthening phase,and the coarsened grains in the weld.
Laser butt welding of DD407 and GH1140 commonly used for aeroengine blisk was conducted.The effects of beam displacement on mechanical properties,microstructure characteristics,and microhardness of the laser joints were analyzed.The results show that the tensile strength of the joint reaches 466.3MPa,which is almost not affected by beam displacements,while determined by the performance of base metal GH1140.The morphology of joint cross section is"wine-cup shaped",and the microstructure of the weld mainly consists of dendritic grains of both sides of the weld and equiaxed grains in the weld centre.The distribution of micro-hardness gradually increases from the base metal of GH1140 to the weld and to the base metal of DD407 in different laser beam displacements,which results from the solution strengthening of W and Co elements,the increased content ofγ'strengthening phase,and the coarsened grains in the weld.
引文
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[3]Yang Huiyan(杨慧艳),Liu Dong(刘东).Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2011,40(4):565
[4]Wu Bing(吴冰),Mao Zhiyong(毛智勇),Guo Haiding(郭海丁)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2013,42(1):16
[5]Wang Xinyu(王新宇),Li Wenya(李文亚),Ma Tiejun(马铁军).Aeronautical Manufacturing Technology(航空制造技术)[J],2015,58(20):56
[6]Gong Weihuai(龚伟怀),Chen Yuhua(陈玉华),Lv Zhen(吕榛)et al.Chinese Lasers(中国激光)[J],2011,38(6):124
[7]Wu Dong(吴栋),Lu Shanping(陆善平),Li Dianzhong(李殿中).Transactions of The China Welding Institution(焊接学报)[J],2014,35(09):69
[8]Liu Chunyan(刘春艳),Ma Rui(马瑞),Tan Caiwang(檀财旺)et al.Chinese Lasers(中国激光)[J],2014,41(8):72
[9]Ao Sansan(敖三三),Luo Zhen(罗震),Shan Ping(单平)et al.The Chinese Journal of Nonferrous Metals(中国有色金属学报)[J],2015,25(8):2099
[10]Han Fengkui(韩凤奎),Yan Ping(燕平),Zhao Jingchen(赵京晨)et al.Journal of Iron and Steel Research(钢铁研究学报)[J],2011,23(9):55
[11]Xiong Jiangang(熊建钢),Wang Liqun(王力群),Hu Qiang(胡强)et al.Electric Welding Machine(电焊机)[J],2001(11):7
[12]Daniel Henkel,Alan W Pense.Structure and Properties of Engineering Materials[M].New York:Mcgraw-Hill Higher Education,2002