2195铝锂合金电子束焊接头的焊后热处理

doi:10.13251/j.issn.0254-6051.2020.01.017

金属热处理 ›› 2020, Vol. 45 ›› Issue (1): 84-90.DOI: 10.13251/j.issn.0254-6051.2020.01.017

2195铝锂合金电子束焊接头的焊后热处理

赵礼¹, 朱瑞灿², 谢美蓉², 王少刚¹

1. 南京航空航天大学材料科学与技术学院, 江苏南京 211106;
2. 首都航天机械有限公司, 北京 100076

收稿日期:2019-07-16 出版日期:2020-01-25 发布日期:2020-04-03
通讯作者: 王少刚,博士,副教授,联系电话:025-52112900,E-mail:sgwang@nuaa.edu.cn
作者简介:赵礼(1993—),男,硕士研究生,主要从事铝锂合金的电子束焊接研究,联系电话:025-52822167,E-mail:zhaoli0318@163.com。
基金资助:
中国运载火箭技术研究院高校联合创新基金(CALT201809)

Post-weld heat treatment of 2195 Al-Li alloy electron beam welded joint

Zhao Li¹, Zhu Ruican², Xie Meirong², Wang Shaogang¹

1. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing Jiangsu 211106, China;
2. Capital Aerospace Machinery Co., Ltd., Beijing 100076, China

Received:2019-07-16 Online:2020-01-25 Published:2020-04-03

摘要/Abstract

摘要： 采用光学显微镜、扫描电镜、能谱仪及X射线衍射仪等微观分析手段,研究不同热处理工艺条件下2195铝锂合金电子束焊接头焊缝区的显微组织演变,探讨接头的焊后热处理强化机制。结果表明,焊后热处理可显著改善接头区域的显微组织,促进强化相的析出,有利于提高接头的力学性能。经过焊后固溶+双级时效热处理,焊态下接头熔合线附近存在的等轴细晶区消失,β′、θ′和T₁等强化相在接头焊缝区析出,与单级时效处理工艺相比,双级时效处理的析出强化效果更为显著。力学性能测试表明,经过双级时效热处理后,接头的抗拉强度达到492.5 MPa,为母材强度的90.4%。接头拉伸断口表面存在许多小韧窝,并伴随出现解理面,接头呈韧-脆混合型断裂特征。

关键词: 铝锂合金, 电子束焊, 焊后热处理, 微观组织, 力学性能

Abstract: Post-weld heat treatment (PWHT) was carried out for the electron beam welded joint of 2195 Al-Li alloy. The microstructure evolution of weld zone under the different heat treatments was investigated by using optical microscope (OM), scanning electron microscopy (SEM) combined with energy dispersive spectrometer (EDS), and X-ray diffractometer (XRD), respectively. And the strengthening mechanism of the welded joint during PWHT process was discussed. The results show that the microstructure of welded joint is greatly improved after PWHT, and the strengthening phases precipitate in weld zone, which is advantageous to the mechanical properties of welded joint. After solution and double aging treatment, the fine equiaxed grain zone (EQZ) near fusion line in as-welded condition disappears, and the strengthening phases such as β′, θ′ and T ₁, are generated in weld zone. Compared with the single aging treatment, the effect of precipitation strengthening is more obvious during double aging treatment. Tests of joint mechanical properties show that, after double aging treatment, the tensile strength of welded joint reaches to 492.5 MPa, which is 90.4% of that of the base metal. There are many small dimples on the fracture surface, as well as the cleavage facets exist, and the joint presents the mixed mode of ductile-brittle fracture.

Key words: Al-Li alloy, electron beam welding, post-weld heat treatment, microstructure, mechanical properties

中图分类号:

TG457.14

赵礼, 朱瑞灿, 谢美蓉, 王少刚. 2195铝锂合金电子束焊接头的焊后热处理[J]. 金属热处理, 2020, 45(1): 84-90.

Zhao Li, Zhu Ruican, Xie Meirong, Wang Shaogang. Post-weld heat treatment of 2195 Al-Li alloy electron beam welded joint[J]. HTM, 2020, 45(1): 84-90.

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2195铝锂合金电子束焊接头的焊后热处理

Post-weld heat treatment of 2195 Al-Li alloy electron beam welded joint

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