预变形对7085超强铝合金环件组织与性能的影响

doi:10.13251/j.issn.0254-6051.2024.09.028

金属热处理 ›› 2024, Vol. 49 ›› Issue (9): 176-184.DOI: 10.13251/j.issn.0254-6051.2024.09.028

预变形对7085超强铝合金环件组织与性能的影响

刘强^1,2,3, 盛智勇¹, 张超², 李杰², 陈泽², 陈送义³, 陈康华³

1.湖南中创空天新材料股份有限公司, 湖南岳阳 414000;
2.湖南京创宇航科技有限责任公司, 湖南岳阳 414000;
3.中南大学轻合金研究院, 湖南长沙 410083

收稿日期:2024-03-11 修回日期:2024-07-05 出版日期:2024-09-25 发布日期:2024-10-29
通讯作者: 盛智勇,高级工程师,硕士,E-mail: shengzy@innochina.ltd
作者简介:刘强(1995—),男,工程师,硕士,主要研究方向为超强铝合金及热处理,E-mail:1061134451@qq.com。
基金资助:
湖南省自然科学基金(2023JJ0668)

Pre-deformation on microstructure and properties of 7085 ultra strength aluminum alloy ring

Liu Qiang^1,2,3, Sheng Zhiyong¹, Zhang Chao², Li Jie², Chen Ze², Chen Songyi³, Chen Kanghua³

1. Hunan Innochina Advanced Materials Co., Ltd., Yueyang Hunan 414000, China;
2. Hunan Innovative Aerospace Technology Co., Ltd., Yueyang Hunan 414000, China;
3. Light Alloy Research Institute, Central South University, Changsha Hunan 410083, China

Received:2024-03-11 Revised:2024-07-05 Online:2024-09-25 Published:2024-10-29

摘要/Abstract

摘要： 通过残余应力、拉伸、冲击、应力腐蚀等试验,结合金相显微镜、扫描电镜以及透射电镜显微组织观察,研究了7085铝合金环件固溶处理后,经1.5%、3%、5%预变形及时效处理后的力学性能以及抗应力腐蚀性能变化规律,并分析相应的微观组织变化特点。结果表明,7085铝合金环件的预变形为3%时,残余应力最大减小87.2%。切向(TD)方向的抗拉强度、屈服强度和断后伸长率显著高于径向(RD)和轴向(AD)方向。经过预变形后,合金的抗拉强度和屈服强度各向异性指数变化较小,但断后伸长率各向异性指数显著提高。预变形量的增加,有利于提高其抗应力腐蚀性能。观察合金的TEM显微组织可以发现,随着预变形量的增加,合金晶内析出相尺寸不断增大,且密度增加,析出相体积分数增大。晶界析出相(GBPs)不断粗化,析出相粒子间距不断增大,无沉淀析出带(PFZ)宽度逐渐增大。

关键词: 预变形, 铝合金环件, 力学性能, 应力腐蚀

Abstract: Mechanical properties and stress corrosion resistance of 7085 aluminum alloy ring after solution treatment-pre-deformation(1.5%, 3%, 5%)-aging treatment were studied by means of residual stress, tensile, impact and stress corrosion tests, and the change characteristics of microstructure were analyzed and observed by means of optical microscope(OM), scanning electron microscope(SEM), transmission electron microscope(TEM). The results show that the maximum residual stress of the 7085 aluminum alloy ring decreases by 87.2% when the pre-deformation is 3%. Tangential direction(TD) tensile strength, yield strength and elongation are significantly higher than that of radial(RD) and axial direction(AD). The anisotropy index of tensile strength and yield strength of the alloy change little after pre-deformation, but the anisotropy index of elongation increases significantly. In advance, the increase of the deformation is helpful to improve its stress corrosion resistance. TEM microstructure of the alloy shows that with the increase of deformation, the size of intragranular precipitates increases, as well as the density and the volume fraction of precipitates, the grain boundary precipitates (GBPs) coarsen, the particle spacing of GBPs increases, and the width of precipitation free zone (PFZ) increases gradually.

Key words: pre-deformation, aluminum alloy ring, mechanical properties, stress corrosion

中图分类号:

TG146.2

刘强, 盛智勇, 张超, 李杰, 陈泽, 陈送义, 陈康华. 预变形对7085超强铝合金环件组织与性能的影响[J]. 金属热处理, 2024, 49(9): 176-184.

Liu Qiang, Sheng Zhiyong, Zhang Chao, Li Jie, Chen Ze, Chen Songyi, Chen Kanghua. Pre-deformation on microstructure and properties of 7085 ultra strength aluminum alloy ring[J]. Heat Treatment of Metals, 2024, 49(9): 176-184.

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预变形对7085超强铝合金环件组织与性能的影响

Pre-deformation on microstructure and properties of 7085 ultra strength aluminum alloy ring

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