预应变及时效处理对7A55铝合金残余应力及组织性能的影响

doi:10.13251/j.issn.0254-6051.2020.10.009

金属热处理 ›› 2020, Vol. 45 ›› Issue (10): 44-47.DOI: 10.13251/j.issn.0254-6051.2020.10.009

预应变及时效处理对7A55铝合金残余应力及组织性能的影响

王淑慧¹, 杨春苗¹, 宋伟², 盛光英¹

1.烟台南山学院工学院, 山东烟台 265713;
2.山东南山铝业股份有限公司国家铝合金压力加工工程技术研究中心, 山东烟台 265700

收稿日期:2020-03-20 出版日期:2020-10-25 发布日期:2020-12-29
作者简介:王淑慧(1981—),女,讲师,硕士,主要研究方向为金属材料热处理过程组织性能优化,E-mail: wangshuhui132@163.com
基金资助:
山东省自然科学基金(ZR2016EMQ11)

Effect of pre-strain and aging treatment on residual stress, microstructure and properties of 7A55 aluminum alloy

Wang Shuhui¹, Yang Chunmiao¹, Song Wei², Sheng Guangying¹

1. College of Engineering, Yantai Nanshan University, Yantai Shandong 265713, China;
2. National Engineering Research Center for Plastic Working of Aluminum Alloys, Shandong Nanshan Aluminum Co., Ltd., Yantai Shandong 265700, China

Received:2020-03-20 Online:2020-10-25 Published:2020-12-29

摘要/Abstract

摘要： 研究了预应变和时效处理对7A55铝合金残余应力和组织演变的影响。利用透射电镜和EBSD观察了微观组织,XRD测试了残余应力,显微硬度计测试了维氏硬度。试验结果表明:固溶后的试样,表面为压应力,沿轧制方向为-75 MPa,横向-115 MPa。经不同的预应变后,表面残余应力逐渐降低,施加2%的预应变后基本消除。180 ℃的时效温度下,残余应力的消减速度显著高于100 ℃和140 ℃下。随预应变量的增大,显微硬度逐渐增大,经3%的预应变后增大为92 HV0.5,提高了27.8%。显微硬度随时效时间的增加先增高后降低,峰值出现在15 h,100、140和180 ℃下时效时分别达到135、143和162 HV0.5。100 ℃×15 h的峰值硬度下晶内主要析出亚稳η′相,与基体呈共格关系;140 ℃时晶内析出相尺寸变大,出现圆片状η′相,与基体呈半共格关系;180 ℃时出现了短棒状η′相,尺寸达到5~20 nm,位相差小于10°的小角度晶界占了80%以上。

关键词: 7A55铝合金, 残余应力, 预应变, 时效

Abstract: Effect of pre-strain and aging treatment on the residual stress, microstructure evolution and mechanical properties of 7A55 aluminum alloy were investigated by using TEM, EBSD, XRD and micro-hardness tester. The results indicate that the surface stress of the solution treated specimens is compressive, being -75 MPa and -115 MPa along rolling and transversal directions respectively. The residual stress decreases with the increase of pre-strain and almost being eliminated after 2% pre-strain. The subduction rate of residual stress for aging at 180 ℃ is obviously quicker than that at 100 ℃ and 140 ℃. The hardness increases with the increase of pre-strain, and after 3% pre-strain it increases to 92 HV0.5, i.e. by 27.8%. The hardness increases first and then decreases with the increases of aging time, and reaches 135, 143 and 162 HV0.5 respectively when aging at 100, 140 and 180 ℃ for 15 h. When aging at 100 ℃ for 15 h where the peak hardness is obtained, the metastable η′ phase is mainly precipitated inside grains and has a coherent relation with the matrix. When aging at 140 ℃, the size of the intragranular precipitated phase increases, and semi-coherent disk-like η′ phase appears. While aging at 180 ℃, short rod-like η′ phase with a size of 5-20 nm appears, and the grain boundary with small angles (<10°) accounts for more than 80%.

Key words: 7A55 aluminum alloy, residual stress, pre-strain, aging

中图分类号:

TG111.7

王淑慧, 杨春苗, 宋伟, 盛光英. 预应变及时效处理对7A55铝合金残余应力及组织性能的影响[J]. 金属热处理, 2020, 45(10): 44-47.

Wang Shuhui, Yang Chunmiao, Song Wei, Sheng Guangying. Effect of pre-strain and aging treatment on residual stress, microstructure and properties of 7A55 aluminum alloy[J]. Heat Treatment of Metals, 2020, 45(10): 44-47.

参考文献

[1]Staley J T, Liu J, Hunt J W H. Aluminum alloys for areostructures[J]. Advanced Materials and Processes, 1997, 152: 10-17.
[2]Heinz A, Haszler A, Keidel C, et al. Recent development in aluminum alloys for aerospace applications[J]. Materials Science and Engineering A, 2000, 280: 102-107.[3]Dursun T, Soutis C. Recent developments in advanced aircraft aluminum alloys[J]. Materials and Design, 2014, 56: 862-871.
[4]梁信, 陈庚华, 陈学海, 等. 等温锻造速率对7085铝合金组织与性能的影响[J]. 粉末冶金材料科学与工程, 2011, 16(2): 290-295.
Liang Xin, Chen Genghua, Chen Xuehai, et al. Effect of isothermal forging rate on microstructure and properties of 7085 aluminum alloy[J]. Materials Science and Engineering of Powder Metallurgy, 2011, 16(2): 290-295.
[5]Todinov M T. Mechanism for formation of the residual stress from quenching[J]. Model Simulation Science Engineer, 1998, 6: 273-276.
[6]Tanner D A, Robinson S. Residual stress prediction and determination in 7010 aluminum alloy forgings[J]. Experimental Mechanics, 2000, 40: 75-78.
[7]王亚楠, 吴运新, 龚海, 等. 初始残余应力对铝合金T形构件加工变形的影响[J]. 热加工工艺, 2019, 48(14): 63-67.
Wang Yanan, Wu Yunxin, Gong Hai, et al. Effect of initial residual stresses on machining deformation of aluminum alloy T-shaped components[J]. Hot Working Technology, 2019, 48(14): 63-67.
[8]Rao K P, Prasad Y. High temperature deformation kinetics of Al-4Mg alloy[J]. Journal of Mechanical Working Technology, 1986, 13: 83-95.
[9]Prasad Y, Seshacharyulu T. Modelling of hot deformation for microstructural control[J]. International Materials Reviews, 1998, 43(6): 243-258.
[10]Huang K, Loge R E. A review of dynamic recrystallization phenomena in metallic materials[J]. Materials and Design, 2016, 111: 548-574.
[11]Le A T H, Cao H P, Kim J R R. Mechanical properties and residual stresses in cold-rolled aluminium channel sections[J]. Engineering Structures, 2019, 199(15): 109562.
[12]Zhan Y, Li Y M, Zhang E, et al. Laser ultrasonic technology for residual stress measurement of 7075 aluminum alloy friction stir welding[J]. Applied Acoustics, 2019, 145: 52-59.

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预应变及时效处理对7A55铝合金残余应力及组织性能的影响

Effect of pre-strain and aging treatment on residual stress, microstructure and properties of 7A55 aluminum alloy

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