摘要
喷砂处理会使航空铝合金薄壁件发生形变,但这种形变存在不稳定性。对不同喷砂工艺下的构件进行自然时效后发现:时效2个月,喷砂件均存在回弹现象,回弹形变率最大为23.8%,最小为2.3%,时效4个月后,变形稳定。分析认为在确保喷砂件预期变形的前提下,喷砂件尺寸稳定性与表层材料的塑性变形程度及其应力分布均匀性有着直接关联。研究结果表明喷砂强度越高,区域喷覆次数越多,则表层塑性变形愈充分,应力分布更均匀,表层质量也就越高,这有助于提高构件尺寸稳定性。
After shot peening（SP）,the expected deformation of aluminum alloy thin-walled component can be obtained,but the deformation is unstable.It is found that after natural aging for 2 months,there is a rebound phenomenon in the components,and the maximum rate of rebound deformation is about 23.8%,and the minimum is about 2.3%,the deformation keeps stable after natural aging for 4 months.According to the analysis,it is concluded that the dimensional stability of the SP components is directly related to the plastic deformation and the stress distribution uniformity of the surface layer.The results show that the higher the shot peening strength is,the more the number of area spraying is,the more the surface plastic deformation is,and the more uniform stress distribution and the higher the surface quality are obtained,which is helpful to improve the dimensional stability of the component.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2017年第8期145-150,共6页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51475483)
湖南省高校科技创新团队支持计划项目(2014207)
中南林业科技大学青年科学研究基金重点项目(Q2012015A)
湖南省研究生科研创新项目(CX2017B405)
关键词
喷砂
铝合金
薄壁件
尺寸稳定性
自然时效
shot peening
aluminum alloy
thin walled component
dimensional stability
natural aging
