激光冲击和深冷处理对7050铝合金残余应力和力学性能的影响
Effects of Laser Shock and Cryogenic Treatment on Residual Stress and Mechanical Properties of 7050 Aluminum Alloy
翁泽钜 1王浩军 2郑建朋 3顾开选 4王俊杰1
作者信息
- 1. 中国科学院空间功热转换技术重点实验室,北京 100190;中国科学院大学,北京 100049
- 2. 航空工业西安飞机工业(集团)有限责任公司,陕西 西安 710089
- 3. 北京航天控制仪器研究所,北京 100094
- 4. 中国科学院空间功热转换技术重点实验室,北京 100190
- 折叠
摘要
研究了不同激光冲击处理后进行深冷处理以及补充低温回火处理对 7050铝合金残余应力和力学性能的影响及其规律.结果表明,激光冲击能够显著提高 7050 铝合金的表面压应力至-260 MPa,而增加深冷-低温回火处理后表面压应力减小约 23%.但合理调整激光冲击工艺参数,能够有效弥补深冷-补充低温回火处理对表面压应力的降低,其中,当激光冲击次数为 3 次时,增加深冷-补充低温回火后表面压应力可达-230 MPa.此外,与单一激光冲击处理相比,激光冲击-深冷-补充低温回火处理后铝合金基体、表面之间的硬度得到均匀化.深冷处理能够促使激光冲击后铝合金试样表面变形加剧,同时晶粒得到进一步细化并且亚晶界增多,使 7050 铝合金的强度提高.
Abstract
The effects of different laser shock treatments on the residual stress and mechanical properties of 7050 aluminum alloy by cryogenic treatment and supplementary low temperature tempering were investigated.The results show that laser shock treatment can significantly increase the surface compressive stress of 7050 aluminum alloy to-260 MPa.However,the surface compressive stress decreases by about 23%after cryogenic tempering.However,the reasonable adjustment of laser shock process parameters can effectively make up for the reduction of surface compressive stress by cryogenic-supplemented low temperature tempering.Among them,when the number of laser shock is 3 times,the surface compressive stress after increasing cryogenic-supplementary low temperature tempering can reach-230 MPa.In addition,compared with single laser shock treatment,the hardness between the matrix and surface of aluminum alloy after laser shock-deep cooling-supplement low temperature tempering treatment is homogenized.The cryogenic treatment can accelerate the surface deformation of aluminum alloy samples after laser shock,and the grain size is further refined and the subgrain boundary increases,which can increase the strength of 7050 aluminum alloy.
关键词
激光冲击/深冷处理/铝合金/残余应力/7050铝合金Key words
laser shock/cryogenic treatment/aluminum alloy/residual stress/7050 Al alloy引用本文复制引用
基金项目
国家自然科学青年基金项目(51805521)
出版年
2024
NETL
NSTL
万方数据