ZTC4合金电子束焊接接头显微组织及力学性能研究
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摘要
以ZTC4钛合金电子束焊接接头为研究对象,通过显微硬度试验、金相分析以及常规力学性能试验,讨论了电子束焊接接头不同位置的组织、形态差异,探究显微组织与接头显微硬度的相关性,以及电子束焊接接头的拉伸性能和冲击性能。通过组织分析及显微硬度测试发现,ZTC4合金电子束焊缝微观组织由原始β相转变为针状α'相,即针状马氏体,其热影响区组织为片状α相与原始β相的混合物,且焊缝处显微硬度最高,热影响区其次,母材最低。通过力学性能测试发现,电子束焊接接头的拉伸和冲击性能与母材相当,说明采用电子束焊接ZTC4可以得到力学性能良好的焊接接头。
The difference of organization in different location of the ZTC4 electron beam welding joint was discussed through the microscopic hardness test, metallographic analysis and conventional mechanical property test. The correlation between microscopic hardness and microstructure of EBW joint and the tensile and impact performance of EBW joint were also studied. Study found that the microstructure of ZTC4 EB weld changed from original β to acicular α', and the microstructure of HAZ was composed of a mixture of flaky α and original β. The microscopic hardness of EBW joint was higher than base metal and HAZ, and tensile and impact performance of EBW joint were equivalent to the base metal. By studying the difference of performance characteristics between ZTC4 EBW joint and base metal, the foundation of research was provided for ZTC4 EBW application, and the wider and wider application in aerospace industry was promoted for large-scale titanium alloy casting and welding structure.
The difference of organization in different location of the ZTC4 electron beam welding joint was discussed through the microscopic hardness test, metallographic analysis and conventional mechanical property test. The correlation between microscopic hardness and microstructure of EBW joint and the tensile and impact performance of EBW joint were also studied. Study found that the microstructure of ZTC4 EB weld changed from original β to acicular α', and the microstructure of HAZ was composed of a mixture of flaky α and original β. The microscopic hardness of EBW joint was higher than base metal and HAZ, and tensile and impact performance of EBW joint were equivalent to the base metal. By studying the difference of performance characteristics between ZTC4 EBW joint and base metal, the foundation of research was provided for ZTC4 EBW application, and the wider and wider application in aerospace industry was promoted for large-scale titanium alloy casting and welding structure.
引文
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[3]刘茜珂,刘昌奎,彭楚峰,等.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.LIU Qianke,LIU Changkui,PENG Chufeng,et al.Study on microstructure and fatigue behavior of electron-beam welding joints of ZTC4 titanium alloy investment castings[J].Failire Analysis and Prevention,2008,3(3):32-36.
[4]陆业航,张杰,吴冰,等.铸造TC4钛合金电子束焊接残余应力测试[J].理化检验:物理分册,2013,49(11):711-713.LU Yehang,ZHANG Jie,WU Bing,et al.Residual stress measurement for cast TC4 alloy by electron beam welding[J].Physical Testing and Chemical Analysis Part A:Physical Testing,2013,49(11):711-713.
[5]陈新民,耿雅辉,何迎春,等.异种状态TC4钛合金电子束焊接性能分析[J].宇航材料工艺,2016,46(2):39-43.CHEN Xinming,GENG Yahui,HE Yingchun,et al.Property of electron beam welded joints in different states of TC4 alloy plates[J].Aerospace Materials&Technology,2016,46(2):39-43.
[6]周彦邦.钛合金铸造概论[M].北京:航空工业出版社,2000.ZHOU Yanbang.Casting conspectus of titanium alloys[M].Beijing:Aerospace Industry Press,2000.
[7]张国宝,冯芝华,张强,等.时效处理对ABST态ZTC4合金力学性能的影响[J].金属热处理,2009,34(5):35-37.ZHANG Guobao,FENG Zhihua,ZHANG Qiang,et al.Effect of aging treatment on mechanical properties of ZTC4 alloy afterαandβphase solution treatment[J].Heat Treatment of Metals,2009,34(5):35-37.
[8]娄贯涛.后处理对ZTC4铸造钛合金材料组织及性能的影响[J].材料开发与应用,2010,25(3):8-10.LOU Guantao.Influence of treatment after casting on the mechanical properties and microstructure of ZTC4 cast titanium alloy[J].Development and Application of Materials,2010,25(3):8-10.
[9]温锦志,卜文德,李建萍,等.厚板TC4钛合金电子束焊接头组织和力学性能研究[J].热加工工艺,2016(17):66-69.WEN Jinzhi,BU Wende,LI Jianping,et al.Study on microstructure and properties of thick TC4 alloy joints welded by electron beam[J].Hot Working Technology,2016(17):66-69.
[10]SENKOV O N,VALENCIA J J,SENKOVA S V,et al.Effect of cooling rate on microstructure of Ti-6Al-4V forging[J].Materials science and technology,2002,18:1471-1478.
[11]侯琦,倪家强,刘胜男,等.TC4-DT钛合金电子束焊接接头性能研究[J].机械制造文摘焊接分册,2014(4):17-20.HOU Qi,NI Jiaqiang,LIU Shengnan,et al.Research of the properties of EBW joint of TC4-DT titanium alloy[J].Machinery Manufacturing Abstract Welding Booklet,2014(4):17-20.