摘要
通过有限元模拟分析,研究了7050高强铝合金锻件的热处理工艺过程,获得了热处理过程中的温度场分布与变化规律,并计算了热处理过程中的残余应力分布。结果表明,固溶过程能有效去除锻件成形过程中的残余应力,但淬火过程又会在锻件表面形成较大的拉应力,这与淬火过程中较大的锻件内外温度梯度有关。按照工艺要求,在随后对锻件进行的不同变形程度的冷压缩后发现,3%的压缩量不但能消除锻件表面的应力,还能使锻件残留有非常有益的压应力,从而能够有效地抑制后续处理过程中的裂纹产生。通过研究验证了7050高强铝合金锻件热处理工艺设计的合理性,具有一定的工程参考价值。
The heat treatment process of 7050 high strength aluminum alloy forging has been studied by means of the finite element analysis. The temperature field distribution and the variation rule in the heat treatment process have been obtained, and the residual stress distribution has been calculated. The results show that the solid solution can effectively remove the residual stress during forming process, but the new tensile stress has been formed in the forging surface during the subsequent quenching process, which is related to the temperature gradient of large forgings during quenching process. According to the process requirements, through cold compression in different deformation degree to the forgings, it is found that 3% of compression quantity can not only eliminate the forging surface tensile stress, but also keep the residual compressive stress which can effectively inhibit the generation of the crack in follow-up processing process. The research results verify the rationality of the heat treatment process for 7050 aluminum alloy forgings. It has engineering reference.
出处
《锻压装备与制造技术》
2013年第4期90-93,共4页
China Metalforming Equipment & Manufacturing Technology
基金
国家自然科学基金项目(51275414)
航空科学基金项目(2011ZE53059)
关键词
7050高强铝合金
锻件
热处理
工艺
模拟
7050 high-strength aluminum alloy
Forging heat-treatment
Process simulation
