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采用表层增塑累积变形工艺和固溶+回归再时效(RRA)热处理工艺研究了H形7050铝合金模锻件组织和力学性能的演变规律，提高了锻件晶粒组织和力学性能的均匀性，获得了调控H形7050铝合金模锻件组织性能均匀性的最佳工艺。结果表明，经过表层增塑累积变形实验及固溶处理后，锻件的组织均匀性显著提升，并获得了最优的固溶工艺为470℃/45 min。在470℃/45 min的最优固溶工艺条件下，研究了RRA过程中H形7050铝合金模锻件肋部表层和中心的组织演变和硬度的变化规律。最后，研究了回归制度对锻件力学性能和断口形貌的影响，发现锻件肋部与腹部的表层和中心力学性能均在120℃/24 h+190℃/5 min+120℃/24 h的RRA工艺下表现最好。
Abstract：The evolution laws of microstructure and mechanical properties of H-shaped 7050 aluminum alloy die forgings were investigated using surface plastic accumulation deformation process and solid solution+retrogression and re-aging(RRA) heat treatment processes. The uniformity of grain structure and mechanical properties of forgings was improved, and the optimal process for regulating the uniformity of microstructure and properties of H-shaped 7050 aluminum alloy die forgings was achieved. The results indicate that after the surface plastic accumulation deformation experiment and solid solution treatment, the microstructure uniformity of forging is significantly improved, with the optimal solid solution process of 470 ℃ for 45 min. Under the optimal solid solution process conditions of 470 ℃ for 45 min, the microstructure evolution and hardness variation of the rib and center regions of the H-shaped 7050 aluminum alloy die forgings during the RRA process were studied. Finally, the influence of retrogression regime on the mechanical properties and fracture morphology of the forgings was examined. It is found that the best mechanical properties are achieved for both the rib and web regions, both at the surface and center, under the RRA process of 120 ℃ for 24 h+190 ℃ for 5 min+120 ℃ for 24 h.
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基本信息:
DOI：
中图分类号:TG146.21
引用信息:
[1]崔明亮,周耀,幸子涵等.7050铝合金模锻件组织性能均匀性调控研究[J].塑性工程学报,2025,32(08):23-32.
基金信息:
国家自然科学基金资助项目(52171018); 河北省自然科学基金资助项目(E2021203059); 河北省科技计划项目(236Z1016G); 极端服役性能精准制造全国重点实验室开放课题(Kfkt2023-09)