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Effect of post-weld heat treatment on double-sided friction stir welded joint of 120 mm ultra-thick SiCp/Al composite plates
Materials Characterization ( IF 4.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.matchar.2020.110668
Qi Qiao , Yishi Su , He Cao , Di Zhang , Qiubao Ouyang

Abstract Friction stir welding (FSW) is a very promising and efficient technique in joining aluminum matrix composites (AMCs) without clear drawbacks, and post-weld heat treatment (PWHT) is a viable option to improve the mechanical properties of friction stir welded joint for heat treatable AMCs. In this work, 120 mm ultra-thick plates of 16 vol% SiCp/2014Al composites were successfully joined by double-sided FSW and subsequently friction stir welded joints were subjected to four different PWHTs (T6–25, T6–70, T4–25 and T4–70, denoting T6 or T4 heat treatment and being quenched in water at 25 °C or 70 °C after solution during heat treatment), respectively. The effect of PWHT on the distributions of microstructures and mechanical properties along the thickness direction in the nugget zone (NZ) of friction stir welded joint is investigated. For as-FSW joint, the tensile strength first decreases gradually along the thickness direction in the shoulder-affected and pin-affected regions, and then increases in the overlapping region. For T6–25 joint, the tensile strength does not vary a great deal in the shoulder-affected and pin-affected regions, and then increases slightly in the overlapping region. After T6–25 PWHT, the finer precipitates θ' are detected, aluminum grains grow up, and the tensile strength is obviously improved both in the NZ and base material attributing to the precipitation strengthening effect from finer precipitates θ'. The distributions of microstructures and mechanical properties along the thickness direction in the NZ are changed from heterogeneous distribution for as-FSW joint to nearly homogeneous distribution for T6–25 joint except in the overlapping region. After different PWHTs, the T6–25 joint shows the highest Vickers hardness in the NZ, followed by T6–70, T4–25 and T4–70 joints, and the as-FSW joint shows the lowest Vickers hardness. A comprehensive understanding can be provided for the effect of PWHT on the double-sided friction stir welded joint of thick or ultra-thick metal matrix composite plates.

中文翻译:

焊后热处理对120 mm超厚SiCp/Al复合板双面搅拌摩擦焊接接头的影响

摘要 搅拌摩擦焊 (FSW) 是一种非常有前途和有效的连接铝基复合材料 (AMC) 的技术,没有明显的缺点,焊后热处理 (PWHT) 是改善搅拌摩擦焊接头机械性能的可行选择可热处理的 AMC。在这项工作中,16 vol% SiCp/2014Al 复合材料的 120 mm 超厚板通过双面 FSW 成功连接,随后搅拌摩擦焊接头受到四种不同的 PWHT(T6-25、T6-70、T4-25和 T4–70,分别表示 T6 或 T4 热处理并在热处理过程中固溶后在 25°C 或 70°C 的水中淬火),分别。研究了焊后热处理对搅拌摩擦焊接接头熔核区 (NZ) 沿厚度方向的显微组织和力学性能分布的影响。对于 as-FSW 接头,抗拉强度首先在肩部影响和销影响区域沿厚度方向逐渐降低,然后在重叠区域增加。对于 T6-25 接头,抗拉强度在肩部影响和销影响区域变化不大,然后在重叠区域略有增加。T6-25 PWHT后,检测到更细的析出物θ',铝晶粒长大,NZ和母材的抗拉强度明显提高,这归因于更细的析出物θ'的沉淀强化作用。除了重叠区域外,新西兰沿厚度方向的微观结构和力学性能的分布从 as-FSW 接头的非均匀分布变为 T6-25 接头的几乎均匀分布。在不同的 PWHT 后,T6-25 接头的维氏硬度在新西兰最高,其次是 T6-70、T4-25 和 T4-70 接头,而 as-FSW 接头的维氏硬度最低。可以全面了解焊后热处理对厚或超厚金属基复合板双面搅拌摩擦焊接头的影响。
更新日期:2020-11-01
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