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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 3    June 2003

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Residual stress in quenched 7075 
aluminum alloy thick plates
LIN Gao-yong (林高用)1, ZHANG Hui(张 辉)1,2,
ZHU Wei(朱 伟)1,  PENG Da-shu(彭大暑)1,
LIANG Xuan(梁 轩)1, ZHOU Hong-zhang(周鸿章)

1. School of Materials Science and Engineering,
Central South University, Changsha 410083, China;
2. College of Materials Science and Engineering,
Hunan University, Changsha 410082, China;
3. Northeast Light Alloys Cooperation Limited, Harbin 150060, China

Abstract:The influence of quenching water temperature, pre-stretching amount and aging temperature and times on residual stress in 7075 aluminum thick plate was studied by the measurement of residual stress using drilling hole method. The results indicate that residual stress decreases by 30% with increasing quenching water temperature from 40℃ to 80℃, 20% with increasing aging temperature from 100℃ to 180℃,and 20% with increasing aging times from 5h to 25h. Also, residual stress decreases to zero with increasing pre-stretching amount to approximately 2%. Hence, residual stress in 7075 aluminum thick plate is reduced by the control of quenching water temperature at 80℃ and with pre-stretching amount of about 2%. An optimal aging temperature and time should be systemically investigated to obtain combination of high mechanical performances and lower residual stress for manufacturing of 7075 aluminum alloy thick plates.

 

Key words:  7075 aluminum alloy; thick plate; quenching; residual stress

ISSN 1672-7029
CN 43-1423/U

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