Ti-6321钛合金钨极惰性气体保护焊接头的微观组织与力学性能
TG444+.1%TG146.2+3%TB31; 采用钨极惰性气体保护(tungsten inert gas,TIG)焊获得了质量良好的大厚度Ti-6321钛合金焊接接头,对比热处理前后焊接接头熔融区、热影响区和母材区的微观组织变化,测试焊接接头的冲击性能、断裂韧度及拉伸性能,并与母材进行对比.结果表明:焊接接头熔融区退火前的组织由粗大β柱状晶组成,晶内为充分生长的针状马氏体α′相,热影响区为β基体和初生α相组成的等轴组织,β基体中析出针状马氏体α'相;退火后,熔融区和热影响区β晶粒内部的马氏体α'相完全转变为次生α相.Ti-6321钛合金焊接接头的冲击韧性,断裂韧度,抗拉...
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| Published in | 材料工程 Vol. 52; no. 6; pp. 159 - 166 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国航发北京航空材料研究院,北京 100095
01.06.2024
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1001-4381 |
| DOI | 10.11868/j.issn.1001-4381.2022.000324 |
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| Abstract | TG444+.1%TG146.2+3%TB31; 采用钨极惰性气体保护(tungsten inert gas,TIG)焊获得了质量良好的大厚度Ti-6321钛合金焊接接头,对比热处理前后焊接接头熔融区、热影响区和母材区的微观组织变化,测试焊接接头的冲击性能、断裂韧度及拉伸性能,并与母材进行对比.结果表明:焊接接头熔融区退火前的组织由粗大β柱状晶组成,晶内为充分生长的针状马氏体α′相,热影响区为β基体和初生α相组成的等轴组织,β基体中析出针状马氏体α'相;退火后,熔融区和热影响区β晶粒内部的马氏体α'相完全转变为次生α相.Ti-6321钛合金焊接接头的冲击韧性,断裂韧度,抗拉强度及伸长率分别为80.3 J/cm2,113.00 MPa·m1/2,873 MPa和9％,为母材的104.7％,84.1％,100％和67.7％,相比母材断口,接头冲击断口具有更为粗糙的阶梯形貌表面以及微观尺寸更小的等轴韧窝,而韧性断口表面整体更加平坦,且疲劳裂纹扩展区更窄. |
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| AbstractList | TG444+.1%TG146.2+3%TB31; 采用钨极惰性气体保护(tungsten inert gas,TIG)焊获得了质量良好的大厚度Ti-6321钛合金焊接接头,对比热处理前后焊接接头熔融区、热影响区和母材区的微观组织变化,测试焊接接头的冲击性能、断裂韧度及拉伸性能,并与母材进行对比.结果表明:焊接接头熔融区退火前的组织由粗大β柱状晶组成,晶内为充分生长的针状马氏体α′相,热影响区为β基体和初生α相组成的等轴组织,β基体中析出针状马氏体α'相;退火后,熔融区和热影响区β晶粒内部的马氏体α'相完全转变为次生α相.Ti-6321钛合金焊接接头的冲击韧性,断裂韧度,抗拉强度及伸长率分别为80.3 J/cm2,113.00 MPa·m1/2,873 MPa和9％,为母材的104.7％,84.1％,100％和67.7％,相比母材断口,接头冲击断口具有更为粗糙的阶梯形貌表面以及微观尺寸更小的等轴韧窝,而韧性断口表面整体更加平坦,且疲劳裂纹扩展区更窄. |
| Abstract_FL | High-quality thick Ti-6321 titanium alloy welded joints were obtained by tungsten inert gas(TIG) welding,the microstructure changes of fusion zone,heat affected zone and base metal zone of the welded joints before and after annealing were compared. The impact properties,fracture toughness and tensile properties were tested,and which were compared with the base metal. The results show that the microstructure of the fusion zone before annealing is composed of coarse β columnar grains with fully grown intragranular acicular martensite α′ phase,and heat affected zone consists of equiaxed structure with β matrix and primary α phase,martensite α′ phase precipitates in β matrix.After annealing,the martensite α′ phase in β matrix of the fusion zone and heat affected zone completely transforms into secondary α phase. The impact toughness,fracture toughness,tensile strength and elongation of Ti-6321 titanium alloy welded joints are 80.3 J/cm2,113.00 MPa·m1/2,873 MPa and 9％,respectively,which are 104.7％,84.1％,100％ and 67.7％ of the base metal,respectively. Compared with the fracture of the base metal,the impact fracture of welded joints has a coarser stepped surface and smaller equiaxed dimples,while the fracture surface of toughness is more flat and the fatigue crack propagation zone is narrower. |
| Author | 祝力伟 闫泰起 陈冰清 郑涛 |
| AuthorAffiliation | 中国航发北京航空材料研究院,北京 100095 |
| AuthorAffiliation_xml | – name: 中国航发北京航空材料研究院,北京 100095 |
| Author_FL | ZHENG Tao ZHU Liwei CHEN Bingqing YAN Taiqi |
| Author_FL_xml | – sequence: 1 fullname: YAN Taiqi – sequence: 2 fullname: ZHENG Tao – sequence: 3 fullname: CHEN Bingqing – sequence: 4 fullname: ZHU Liwei |
| Author_xml | – sequence: 1 fullname: 闫泰起 – sequence: 2 fullname: 郑涛 – sequence: 3 fullname: 陈冰清 – sequence: 4 fullname: 祝力伟 |
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| Copyright | Copyright © Wanfang Data Co. Ltd. All Rights Reserved. |
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| DOI | 10.11868/j.issn.1001-4381.2022.000324 |
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| DocumentTitle_FL | Microstructure and mechanical properties of Ti-6321 titanium alloy joint by tungsten inert gas welding |
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| Keywords | 力学性能 TIG welding microstructure 微观组织 Ti-6321钛合金 mechanical property heat treatment 热处理 Ti-6321 titanium alloy TIG焊 |
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| Title | Ti-6321钛合金钨极惰性气体保护焊接头的微观组织与力学性能 |
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