采用冷胀形工艺降低2219铝合金环的淬火残余应力

Reduction in Quenching Residual Stress of 2219 Aluminum Alloy Ring by Cold Bulging Process

摘要:

通过固溶时效工艺可以显著提升2219铝合金的力学性能，但在淬火过程中会产生较大的残余应力，对其尺寸稳定性、疲劳强度、应力腐蚀等性能产生不利影响。为降低2219铝合金环件的淬火残余应力，在淬火和人工时效之间引入冷胀形工艺。首先，采用有限元法模拟分析了2219铝合金环淬火、冷胀形后残余应力的数值及分布规律。其次，采用钻孔法测量了环在淬火、人工时效和固溶-冷胀形-人工时效后的残余应力。研究了冷胀形工艺参数对残余应力数值和均匀性的影响。结果表明，引入冷胀形工艺可以使2219铝合金环件淬火残余应力降低85%以上。

Abstract:

The mechanical properties of 2219 aluminum alloy can be significantly improved by the solution-aging process. Nevertheless, large residual stress is generated during quenching, exerting negative effects on dimensional stability, fatigue strength, stress corrosion, and other properties. A cold bulging process was introduced between quenching and artificial aging to reduce the quenching residual stress of the 2219 aluminum alloy ring. Firstly, the numerical value and distribution law of the residual stress after quenching and cold bulging of the 2219 aluminum alloy ring were analyzed by finite element method (FEM) simulation. Secondly, the residual stress after quenching, artificial aging and solution-cold bulging-artificial aging of the ring was measured by the drilling method. Additionally, the effect of cold bulging process parameters on residual stress value and uniformity was investigated. Experimental results show that quenching residual stress of 2219 aluminum alloy ring is reduced by up to 85% or more.