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材料工程  2020, Vol. 48 Issue (1): 115-120    DOI: 10.11868/j.issn.1001-4381.2018.000295
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
热处理温度对TC17(α+β)/TC17(β)钛合金线性摩擦焊接头组织及力学性能的影响
李晓红1,2, 张彦华1, 李赞2, 李菊2, 张田仓2
1. 北京航空航天大学 机械工程及自动化学院, 北京 100191;
2. 中国航空制造技术研究院 航空焊接与连接技术航空科技重点实验室, 北京 100024
Effect of heat treatment temperatures on microstructure and mechanical property of linear friction welded joints of titanium alloys TC17(α+β)/TC17(β)
LI Xiao-hong1,2, ZHANG Yan-hua1, LI Zan2, LI Ju2, ZHANG Tian-cang2
1. School of Mechanical Engineering & Automation, Beihang University, Beijing 100191, China;
2. Aeronautical Key Laboratory for Welding and Joining Technologies, AVIC Manufacturing Technology Institute, Beijing 100024, China
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摘要 对TC17(α+β)/TC17(β)钛合金线性摩擦焊接头进行热处理实验,采用光学显微镜(OM),扫描电子显微镜(SEM)和显微硬度仪等检测手段,研究不同热处理温度对焊接接头微观组织及力学性能的影响。结果表明:焊态下,接头焊缝区发生再结晶,界面处为亚稳定β相组织,显微硬度低于母材,接头高周疲劳强度为345 MPa。TC17(α+β)侧热力影响区因焊接速率过快,残留了大量的初生α相。经过焊后热处理,亚稳定β相分解,焊缝析出弥散的(α+β)相。随着热处理温度的升高,细小的次生α相长大,部分发生球化。热处理后,因亚稳定β相分解,焊缝及热力影响区的显微硬度大幅度升高,接头疲劳强度平均提高65 MPa;随着热处理温度的升高,接头热力影响区的断裂韧度增加。
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李晓红
张彦华
李赞
李菊
张田仓
关键词 TC17钛合金线性摩擦焊热处理力学性能    
Abstract:The heat treatment experiments were carried on titanium alloys (TC17 (α+β) + TC17 (β)) linear friction welded joint. Optical microscope (OM), scanning electron microscope (SEM) and microhardness instrument were used to investigate the effects of different heat treatment temperatures on the microstructure and mechanical properties of welded joints. The results show that recrystallization occurs at the weld zone (as weld). Metastable β phase structure is formed at the weld interface of as-welded joint. The microhardness of as-welded joint is lower than base metal and high cycle fatigue strength of as-welded joints is 345 MPa. Because welding speed is rapid, a large number of primary α phase is retained in thermal mechanically affected zone (TMAZ) of TC17 (α+β). After post-weld heat treatment, the metastable β phase structure is decomposed and dispersed (α+β) phase is separated out at the welded joints. With the increase of the heat treatment temperature, small secondary α phase is grown up and phases are partly spheroidized. After heat treatment, because metastable β phase structure is decomposed, the micro-hardness is greatly increased at the weld zone and TMAZ, and fatigue strength is increased by an average of 65 MPa at the welded joints. With the increase of the heat treatment temperature, the fracture toughness is improved at the TMAZ of welded joints.
Key wordsTC17 alloy    linear friction welding    heat treatment    mechanical property
收稿日期: 2018-12-20      出版日期: 2020-01-09
中图分类号:  TG453+.9  
基金资助: 
通讯作者: 李赞(1993-),男,助理工程师,硕士研究生,主要从事钛合金线性摩擦焊方面的研究工作,联系地址:北京市朝阳区东军庄1号院中国航空制造技术研究院(100024),E-mail:lizan0306@qq.com     E-mail: lizan0306@qq.com
引用本文:   
李晓红, 张彦华, 李赞, 李菊, 张田仓. 热处理温度对TC17(α+β)/TC17(β)钛合金线性摩擦焊接头组织及力学性能的影响[J]. 材料工程, 2020, 48(1): 115-120.
LI Xiao-hong, ZHANG Yan-hua, LI Zan, LI Ju, ZHANG Tian-cang. Effect of heat treatment temperatures on microstructure and mechanical property of linear friction welded joints of titanium alloys TC17(α+β)/TC17(β). Journal of Materials Engineering, 2020, 48(1): 115-120.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.000295      或      http://jme.biam.ac.cn/CN/Y2020/V48/I1/115
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