Transactions of Materials and Heat Treatment

Title：Influence law of laser local heat treatment on uniaxial tensile and forming properties for 5052-H32 aluminum alloy sheet

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ClassificationCode：TG166.3

year,vol(issue):pagenumber：2023,48(9):204-212

Abstract：

Aiming at the problem of poor formability of 5052-H32 aluminum alloy sheet at room temperature, the laser rapid heating method was used for local heat treatment on the sheet, for the first time, the forming limit experiment of sheet metal after laser local heat treatment under full strain path was carried out to study the influence of laser local heat treatment process on its formability. The results of uniaxial tensile experiment show that the laser local heat treatment on 5052-H32 aluminum alloy sheet can play a significant softening effect, the tensile strength and yield strength are reduced by 17.6% and 43.3%, respectively, and the elongation after break is increased by 117%. The value of strain hardening index n increases with the increasing of peak temperature of heat treatment. When the temperature of conventional annealing heat treatment reaches 400 ℃ and the peak temperature of laser local heat treatment reaches 500 ℃, the fiber tissue produced during the rolling process is transformed into recrystallized tissue, and the texture strength is reduced. The forming limit experiment results of H32 state, conventional annealing heat treatment and laser local heat treatment show that after laser local heat treatment (400 ℃), the forming limit under full strain path is increased compared with the H32 state as a whole, and the value of ultimate plane strain FLC0 is increased by 39.1%, indicating that the mechanical properties of 5052-H32 aluminum alloy sheet can be changed by laser local heat treatment, and its formability is improved effectively.

Funds：

魏桥国科高研院-中科院金属所研发项目（GYYJSBU2022003）

作者简介：刘芃成（1998-），男，硕士研究生 E-mail：973518526@qq.com 通信作者：宋鸿武（1981-），男，博士，研究员 E-mail：hwsong@imr.ac.cn

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