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Microstructural evolutions and mechanical properties of 6082 aluminum alloy part produced by a solution-forging integrated process
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2022-07-05 , DOI: 10.1016/j.jmatprotec.2022.117715
Ning Zhao , Huijuan Ma , Qian Sun , Zhili Hu , Yang Yan , Tianfu Chen , Lin Hua

The conventional forging process for 6082 aluminum alloy entails the following steps: preheating, hot forging, solution heat treatment (SHT), and artificial aging. In this study, 6082 aluminum alloy automobile parts were successfully manufactured under industrialized conditions using a novel forging process that integrated SHT and hot forging into one operation, resulting in the cost savings compared with the conventional forging process. Mechanical properties were determined using tensile tests, while microstructural evolutions were revealed using optical microscopy (OM), scanning electron microscope (SEM), electron backscatter diffraction (EBSD), high-resolution transmission electron microscopy (HRTEM), and finite element method (FEM) simulation. It is found that the abnormal grain growth (AGG) induced by post-forging SHT occurred in the surface layer of conventionally processed parts, resulting in a decrease in the strengthening effects of grain boundary and dislocation, as well as a decrease in tensile strength, yield strength, and elongation. However, benefiting from the SHT before forging and the immediate quenching after forging, the AGG triggered by secondary recrystallization was suppressed by using the novel forging process. Along with achieving mechanical properties comparable to those obtained through conventional forging in the interior, the novelly processed parts' surface layer exhibits relatively consistent properties due to their homogeneous grain structure. The results above demonstrate the efficacy of the novel solution-forging integrated process, which is well-suited for industrial production, application, and promotion.



中文翻译:

溶液锻造一体化工艺生产的6082铝合金零件的显微组织演变和力学性能

6082铝合金的常规锻造工艺需要以下步骤:预热、热锻、固溶热处理(SHT)和人工时效。在这项研究中,6082 铝合金汽车零件在工业化条件下使用一种将 SHT 和热锻合为一体的新型锻造工艺成功制造,与传统锻造工艺相比,节省了成本。使用拉伸试验确定机械性能,同时使用光学显微镜 (OM)、扫描电子显微镜 (SEM)、电子背散射衍射 (EBSD)、高分辨率透射电子显微镜 (HRTEM) 和有限元法 (FEM) 揭示微观结构演变) 模拟。发现锻后SHT引起的异常晶粒生长(AGG)发生在常规加工零件的表层,导致晶界和位错强化效果降低,抗拉强度降低,屈服强度和伸长率。然而,得益于锻前的 SHT 和锻后的立即淬火,二次再结晶引发的 AGG 通过使用新的锻造工艺得到抑制。除了在内部实现与通过传统锻造获得的机械性能相当的机械性能外,新加工零件的表面层由于其均匀的晶粒结构而表现出相对一致的性能。上述结果证明了新型溶液锻造集成工艺的功效,

更新日期:2022-07-10
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