文档介绍：1
第 41 卷第 4 期中南大学学报(自然科学版) Vo l .41 No .4
2010 年 8 月 Journal of Central South University (Science and Technology) Aug. 2010
不同淬火工艺对 7075 铝合金厚板残余应力的影响
龚海,吴运新,廖凯
(中南大学机电工程学院,湖南长沙,410083)
摘要:对 7075 铝合金厚板进行固溶处理后,分别采用浸没淬火和喷淋淬火再进行预拉伸处理。运用裂纹柔度
法检测 2 种淬火板和相应的预拉伸板内部的残余应力,研究不同淬火工艺对铝厚板残余应力产生和预拉伸后重新
分布的影响。研究结果表明:淬火速率越大,铝厚板内产生的残余应力也越大,浸没淬火试样的残余压应力和残
余拉应力分别比喷淋淬火试样的残余压应力和残余拉应力大 60%和 %;经过预拉伸处理后,淬火应力得到极
大消减,残余应力被控制在±20 MPa 以内,满足后续加工的要求;当拉伸量为 %,%和 %时,残余应力
的消减效果相当。
关键词:残余应力;裂纹柔度法;铝合金;预拉伸
中图分类号:; 文献标志码:A 文章编号:1672−7207(2010)04−1354−06
Influence of different quenching techniques on residual stress of
7075 aluminum alloy thick-plate
GONG Hai, WU Yun-xin, LIAO Kai
(School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China)
Abstract: After solution treatment, 7075 aluminum alloy thick-plates were quenched by immersion and spraying
separately, then treated by pre-stretching process. Residual stresses of immerging quenched plates and spraying quenched
plates, as well as stresses of corresponding pre-stretched plates were measured with pliance method. The
influence of different quenching techniques on residual stress developing and redistributing after pre-stretching of 7075
aluminum alloy thick-plate were studied. The results show that the faster the quenching speed, the larger the residual
st