强制冷却和低温时效对2198-T3/7A04-T6异种铝合金FSW接头组织及性能的影响

doi:10.13251/j.issn.0254-6051.2023.09.002

金属热处理 ›› 2023, Vol. 48 ›› Issue (9): 8-13.DOI: 10.13251/j.issn.0254-6051.2023.09.002

强制冷却和低温时效对2198-T3/7A04-T6异种铝合金FSW接头组织及性能的影响

孙博^1,2, 聂佳民^1,2, 李晓丹³, 何长树^1,2

1.东北大学材料科学与工程学院, 辽宁沈阳 110819;
2.东北大学材料各向异性与织构教育部重点实验室, 辽宁沈阳 110819;
3.沈阳飞机工业(集团)有限公司, 辽宁沈阳 110850

收稿日期:2023-03-12 修回日期:2023-07-15 出版日期:2023-09-25 发布日期:2023-10-25
通讯作者: 何长树,副教授,博士,E-mail:changshuhe@mail.neu.edu.cn
作者简介:孙博(1997—),男,硕士研究生,主要研究方向为铝合金搅拌摩擦焊,E-mail:18732321812@163.com。

Effects of forced cooling and low temperature aging on microstructure and mechanical properties of FSW joint of 2198-T3/7A04-T6 dissimilar aluminum alloy

Sun Bo^1,2, Nie Jiamin^1,2, Li Xiaodan³, He Changshu^1,2

1. School of Materials Science and Engineering, Northeast University, Shenyang Liaoning 110819, China;
2. Key Laboratory of Anisotropy and Texture of Materials, Northeast University, Shenyang Liaoning 110819, China;
3. Shenyang Aircraft Industry Group Co., Ltd., Shenyang Liaoning 110850, China

Received:2023-03-12 Revised:2023-07-15 Online:2023-09-25 Published:2023-10-25

摘要/Abstract

摘要： 在空冷与强制冷却下对2198-T3/7A04-T6异种铝合金进行搅拌摩擦拼焊,并在焊后对其接头进行低温时效处理,研究了强制冷却和低温时效对焊接接头低硬度区微观组织特征及接头力学性能的影响。研究发现,两种条件下,2198-T3铝合金一侧的热影响区内均出现了低硬度区,但强制冷却＋低温时效条件下接头低硬度区的硬度值明显更高,为94.5 HV0.1,并且接头的平均屈服强度、抗拉强度和伸长率分别为312 MPa、443 MPa和8.9%,屈服强度和抗拉强度分别达到母材强度的97.5%和96.9%,而空冷＋低温时效条件下仅为母材强度的89.0%和91.6%。强制冷却＋低温时效条件下接头的力学性能更优的主要原因是:焊接过程中施加强制冷却能有效抑制接头低硬度区内θ′相T1相的溶解与粗化,使其在后续低温时效过程中能获得更好的时效强化效果。

关键词: 低温时效, 水下搅拌摩擦焊, 析出相, 力学性能

Abstract: 2198-T3/7A04-T6 dissimilar aluminum alloy was friction stir welded under air cooling and forced cooling respectively, and the joint was aged at low temperature after welding. The effects of forced cooling and low temperature aging on the microstructure characteristics and mechanical properties of the welded joint were studied. It's found that a low hardness zone appears in the heat affected zone of the 2198-T3 aluminum alloy side under both conditions, but the hardness value of the low hardness zone of the joint under forced cooling+low temperature aging conditions is significantly higher, reaching 94.5 HV0.1. The average yield strength, tensile strength and elongation of the joint are 312 MPa, 443 MPa, and 8.9%, respectively. The yield strength and tensile strength reach 97.5% and 96.9% of the base material strength, respectively. However, under air cooling and low temperature aging conditions, they are only 89.0% and 91.6% of the base material strength. The main reason for the better mechanical properties of joint under forced cooling and low-temperature aging conditions is that applying forced cooling during the welding can effectively suppress the dissolution and coarsening of θ′ and T1 phases in the low hardness zone of the joint, enabling it to achieve better aging strengthening effect in the subsequent low-temperature aging treatment.

Key words: low temperature aging, underwater friction stir welding, precipitated phase, mechanical properties

中图分类号:

TG156.6

孙博, 聂佳民, 李晓丹, 何长树. 强制冷却和低温时效对2198-T3/7A04-T6异种铝合金FSW接头组织及性能的影响[J]. 金属热处理, 2023, 48(9): 8-13.

Sun Bo, Nie Jiamin, Li Xiaodan, He Changshu. Effects of forced cooling and low temperature aging on microstructure and mechanical properties of FSW joint of 2198-T3/7A04-T6 dissimilar aluminum alloy[J]. Heat Treatment of Metals, 2023, 48(9): 8-13.

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强制冷却和低温时效对2198-T3/7A04-T6异种铝合金FSW接头组织及性能的影响

Effects of forced cooling and low temperature aging on microstructure and mechanical properties of FSW joint of 2198-T3/7A04-T6 dissimilar aluminum alloy

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