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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Improving the mechanical properties and reducing the residual stresses of AA7075 by combination of cyclic close die forging and precipitation hardening
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Improving the mechanical properties and reducing the residual stresses of AA7075 by combination of cyclic close die forging and precipitation hardening

机译：通过循环密闭模具锻造和沉淀硬化组合改善机械性能并降低AA7075的残余应力

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摘要

As one of the major strengthening mechanisms, the precipitation hardening is used to enhance the mechanical properties of aluminum alloys. Based on the results of the residual stress measurement, after fast quenching, the core of the material is under tensile stress while the surfaces are under compressive residual stress. Distortion commonly happens during the machining of precipitation-hardened aluminum alloys due to the residual stresses created during the quenching step in the heat treatment process. In this study, the combination of cyclic close die forging and precipitation hardening was used to improve the mechanical properties and control the residual stresses of AA 7075, simultaneously. According to the results, a considerable level of residual stresses was developed in the sample after the quenching step. Performing the cyclic close die forging process immediately after the quenching step changed the pattern of the residual stresses and reduced them significantly. The reduction of the residual stresses after the first pass of cyclic close die forging was about 50%, while after two passes, the sample was almost fully stress relieved. Besides, the results of the microhardness and uniaxial tensile tests demonstrated the improvement of the mechanical properties of the processed samples when compared to the T6 condition. Also, in comparison to AA 7075-T6, the yield stress, ultimate tensile stress, and microhardness were increased by about 24%, 22%, and 48%, respectively.
机译：作为主要的强化机制之一，沉淀硬化用于增强铝合金的机械性能。基于残余应力测量的结果，在快速淬火之后，材料的核心在拉伸应力下，而表面处于压缩残余应力。由于在热处理过程中淬火步骤期间产生的残余应力，在加工沉淀硬化的铝合金期间发生扭曲。在该研究中，使用循环密闭模锻和沉淀硬化的组合来改善机械性能并同时控制AA ​​7075的残余应力。根据结果​​，在淬火步骤之后在样品中开发相当大的残余应力。在淬火步骤改变残余应力的图案并显着减少后，立即执行循环闭合模锻工艺。在循环密闭模具锻造后的第一次通过后的残余应力的降低约为50％，而在两次通过后，样品几乎完全应释放。此外，与T6条件相比，微硬度和单轴拉伸试验的结果证明了加工样品的力学性质的改善。另外，与AA 7075-T6相比，屈服应力，最终拉伸应力和微硬度分别增加了约24％，22％和48％。

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