Effect of Vibratory Stress Relief Treatment on Fatigue Property of 7055-T7751 Aluminum Alloy
摘 要
对7055-T7751铝合金预拉伸板(预应变为1%~3%)进行振动时效处理,并在不同最大应力(300,350,400,500 MPa)下进行疲劳试验,研究了振动时效处理对合金显微组织、显微硬度、表面残余应力和疲劳性能的影响。结果表明:振动时效处理对显微组织和显微硬度的影响很小,振动时效后的组织仍为轧制板材织构取向组织;振动时效处理后,合金中纵向和横向残余拉应力发生明显松弛,且纵向残余应力分布有所均化;振动时效处理明显提高了纵向和横向试样的疲劳性能,在最大应力350 MPa条件下,纵向和横向试样的疲劳寿命分别提高了219.0%和29.1%,疲劳极限分别提高了9.9%和5.1%。
Abstract
7055-T7751 aluminum alloy pre-stretching plate (pre-strains of 1%-3%) was subjected to vibratory stress relief treatment, and then to fatigue tests under different maximum stresses (300, 350, 400, 500 MPa). The effects of vibratory stress relief treatment on microstructure, microhardness, surface residual stress and fatigue property of the alloy were studied. The results show that the vibratory stress relief treatment had little effect on the microstructure and microhardness; the microstructure after vibratory stress relief was still the texture orientation structure of the rolled plate. After the vibratory stress relief treatment, the longitudinal and transverse residual tensile stresses in the alloy were obviously relaxed, and the longitudinal residual stress distribution was homogenized. The vibratory stress relief treatment improved the fatigue performance of the longitudinal and transverse specimens significantly. Under the maximum stress of 350 MPa, the fatigue lives of the longitudinal and transverse specimens increased by 219.0% and 29.1%, and the fatigue limits were improved by 9.9% and 5.1%, respectively.
中图分类号 TB534 DOI 10.11973/jxgccl201908007
所属栏目 材料性能及应用
基金项目 国家自然科学基金资助项目(51771155);装备预研领域基金资助项目(61409220202)
收稿日期 2019/5/8
修改稿日期 2019/7/9
网络出版日期
作者单位点击查看
备注马永波(1964-),男,甘肃临夏人,高级工程师,学士
引用该论文: MA Yongbo,CUI Tengfei,PAN Yifan,CHENG Shumin,LIU Daoxin. Effect of Vibratory Stress Relief Treatment on Fatigue Property of 7055-T7751 Aluminum Alloy[J]. Materials for mechancial engineering, 2019, 43(8): 35~40
马永波,崔腾飞,潘一帆,成书民,刘道新. 振动时效处理对7055-T7751铝合金疲劳性能的影响[J]. 机械工程材料, 2019, 43(8): 35~40
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【3】SHALVANDI M, HOJJAT Y, ABDULLAH A, et al. Influence of ultrasonic stress relief on stainless steel 316 specimens:A comparison with thermal stress relief[J]. Materials & Design, 2013, 46:713-723.
【4】SUN Y S, JIANG F L, ZHANG H, et al. Residual stress relief in Al-Zn-Mg-Cu alloy by a new multistage interrupted artificial aging treatment[J]. Materials & Design, 2016, 92:281-287.
【5】WANG J S, HSIEH C C, LIN C M, et al. The effect of residual stress relaxation by the vibratory stress relief technique on the textures of grains in AA 6061 aluminum alloy[J]. Materials Science and Engineering:A, 2014, 605:98-107.
【6】李亚非, 狄欧. 振动时效去除铝合金锻件残余应力效果的研究[J]. 热加工工艺, 2015, 44(24):222-225.
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【8】杨铭伟, 王时英. 超声振动时效机理分析及试验研究[J]. 中国农机化学报, 2016, 37(2):70-74.
【9】梁岩里, 谢飞, 左彬, 等. 振动时效在铝合金薄壁件加工过程中的应用[J]. 航空制造技术, 2016(6):85-87.
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【12】李鹏, 刘道新, 关艳英, 等. 喷丸强化对新型7055-T7751铝合金疲劳性能的影响[J].机械工程材料,2015,39(1):86-89.
【13】LIU C, LIU D, ZHANG X, et al. Effect of the ultrasonic surface rolling process on the fretting fatigue behavior of Ti-6Al-4V alloy[J]. Materials, 2017, 10(7):833.
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