Effects of a New Post-Weld Heat Treatment Process on the Properties of Friction Stir Welded Joints

doi:10.7652/xjtuxb201708022

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Effects of a New Post-Weld Heat Treatment Process on the Properties of Friction Stir Welded Joints

更新时间：2025-07-09

- Effects of a New Post-Weld Heat Treatment Process on the Properties of Friction Stir Welded Joints
- Vol. 51, Issue 8, Pages: 136-141(2017)
- 作者机构：
  
  1. 武汉理工大学现代汽车零部件技术湖北省重点实验室,武汉,430070
  2. 武汉理工大学汽车零部件技术湖北省协同创新中心,武汉,430070
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201708022
  CLC： TG146.2
- Online First：10 August 2017，
  
  Published：2017
- 稿件说明：
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Effects of a New Post-Weld Heat Treatment Process on the Properties of Friction Stir Welded Joints[J]. 2017, 51(8): 136-141.
DOI：

Effects of a New Post-Weld Heat Treatment Process on the Properties of Friction Stir Welded Joints[J]. 2017, 51(8): 136-141. DOI： 10.7652/xjtuxb201708022.

摘要

为了抑制焊后热处理过程中搅拌摩擦焊(FSW)接头晶粒异常长大(AGG)现象的发生、保证接头的强韧性

提出固溶-变形-时效一体化的新型焊后热处理工艺。该工艺以2024-O铝合金FSW接头为研究对象

在450 ℃保温40 min后水淬至室温

然后冷拉伸变形

并于190 ℃人工时效处理。经光学显微镜观察发现

450 ℃固溶处理能够显著抑制接头AGG现象的发生。固溶后冷变形结合后续人工时效处理工艺

接头力学性能明显改善

接头显微硬度和强度随着冷变形量的增加而不断提高

当变形量为10%时

接头的硬度和强度值达到最大。由于接头没有发生AGG

焊缝细小的等轴晶和析出相使得新型焊后热处理FSW接头的强度、硬度和塑性均高于传统固溶时效热处理接头。

Abstract

A new post-weld heat treatment process is presented to inhibit the abnormal grain growth(AGG)of friction stir welded(FSW)joints during the post-weld heat treatment and to ensure the strength and toughness of the FSW joints. The 2024-O aluminum alloy FSW joints are heated at 450 ℃ for 40 min then are quenched in water

followed by cold stretching and artificial aging. It is found that no AGG occurs in the joints during the solid-solution treatment at 450 ℃. The hardness and strength of the joints increase as the amount of the cold stretching increases after the solid-solution treatment followed by cold stretching and artificial aging. When the joints have a 10% cold stretching

the hardness and the ultimate strength reach the maximum value. Therefore

the stability of microstructure and the mechanical of properties the FSW joints can be improved by adopting the new post-weld heat treatment process.

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references

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