Study of welding peak temperatures on microstructures and hardness of heat affected zone in 2024-T3 aluminium alloy

被引：5

作者：

Chen, C. S. ^{[2
]}

Yang, J. G. ^{[3
]}

Tan, A. H. ^{[1
]}

机构：

[1] Ching Yun Univ, Dept Mech Engn, Jhongli 320, Taiwan

[2] Lunghwa Sci & Technol Univ, Dept Mech Engn, Guai Shan 333, Taiwan

[3] Chung Shan Inst Sci & Technol, Lungtan, Taiwan

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2009年 / 25卷 / 07期

关键词：

Aluminium; Welding peak temperatures; Heat affected zone; Gleeble simulation; Microstructure; Hardness; STIR WELDED-JOINTS; MG ALLOYS; FRICTION; BEHAVIOR; FRACTURE; CRACKING;

D O I：

10.1179/174328408X374676

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The influence of welding thermal cycle peak temperatures and post-weld heat treatments on the microstructures and mechanical properties of the heat affected zone (HAZ) for 2024-T3 aluminium alloy have been investigated by Gleeble HAZ simulation. Differential scanning calorimetry (DSC) in conjunction with transmission electron microscopy (TEM) is used to characterise the HAZ microstructures. The welded HAZ in the region of peak temperature 414 degrees C has the lowest hardness after natural aged temper, which is primarily due to the precipitation and coarsening of stable S phases. When the peak temperature of welded HAZ is larger than 414 degrees C, the hardness of HAZ increasing with an increasing peak temperature can be seen, which is due to higher peak temperature thermal cycles treatment inducing the dissolution of precipitations in the matrix, and, after the natural aging treatment, Guinier-Preston (GPB) and GPB2 zones precipitating out in the matrix again can be seen. Post-weld T81 artificial aging (PWAA-T81) heat treatment has no effect on improving the HAZ hardness; the HAZ hardness of the 2024-T3 alloy obtained by PWAA-T81 is less than that obtained by natural aging, and its lowest hardness is shifted to the region of peak temperature, which is 452 degrees C, because overaging induces coarse and sparse amounts of stable S phase.

引用

页码：896 / 904

页数：9

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