退火温度对拉深成形用Al-3.5Mg合金板材组织与性能的影响

doi:10.13251/j.issn.0254-6051.2024.06.005

金属热处理 ›› 2024, Vol. 49 ›› Issue (6): 29-35.DOI: 10.13251/j.issn.0254-6051.2024.06.005

退火温度对拉深成形用Al-3.5Mg合金板材组织与性能的影响

吴镇宇^1,2, 秦颐鸣^1,2, 李永弟^1,2, 周培林³, 周佳菊¹, 黎渠¹

1.广西产研院新型功能材料研究所有限公司, 广西南宁 530200;
2.广西生态铝绿色制造重点实验室, 广西百色 533000;
3.中国科技开发院广西分院, 广西南宁 530022

收稿日期:2023-11-12 修回日期:2024-04-08 出版日期:2024-06-25 发布日期:2024-07-29
通讯作者: 周培林,工程师,硕士,E-mail:zhou11030334@sina.com
作者简介:吴镇宇(1985—),男,高级工程师,硕士,主要研究方向为金属材料,E-mail:356496272@qq.com。
基金资助:
广西科技基地与人才专项(桂科AD23023009);南宁市科技重大专项(20221021)

Effect of annealing temperature on microstructure and mechanical properties of Al-3.5Mg alloy sheet for deep drawing

Wu Zhenyu^1,2, Qin Yiming^1,2, Li Yongdi^1,2, Zhou Peilin³, Zhou Jiaju¹, Li Qu¹

1. Institute of Functional Material Co., Ltd., Guangxi Institute of Industrial Technology, Nanning Guangxi 530200, China;
2. Guangxi Key Laboratory of Green Manufacturing for Ecological Aluminum Industry, Baise Guangxi 533000, China;
3. Guangxi Branch of Chinese Science and Technology Development Institute, Nanning Guangxi 530022, China

Received:2023-11-12 Revised:2024-04-08 Online:2024-06-25 Published:2024-07-29

摘要/Abstract

摘要： 采用光学显微镜(OM)、扫描电镜(SEM)、拉伸试验等方法,研究了退火温度对拉深成形用Al-3.5Mg合金板材显微组织、常规拉伸性能和成形性能的影响。结果表明,随着退火温度的升高,Al-3.5Mg合金的强度和屈强比呈阶梯式降低,伸长率逐渐增大;n-值、r-值和LDR值等成形性能指标显著提高,且各向异性程度呈先增大后减小趋势;退火温度在340~360 ℃时,显微组织发生完全再结晶演变。建立了Al-3.5Mg合金屈服强度与晶粒尺寸之间的Hall-Petch量化公式。工程实践证实,工业大生产采用360 ℃退火8 h,可以确保最终拉深成形的效果。

关键词: Al-3.5Mg合金, 退火温度, 显微组织, 成形性

Abstract: Effect of annealing temperature on the microstructure, conventional tensile properties and formability of Al-3.5Mg alloy sheet for deep drawing was studied by means of optical microscope, scanning electron microscope (SEM) and tensile test. The results show that with the increase of annealing temperature, the strength and yield ratio of the Al-3.5Mg alloy decreases in a ladder-shape, while the elongation gradually increases. The n, r- value and LDR value significantly increases, and the anisotropy increases first and than decreases. When the annealing temperature is raised from 340 ℃ to 360 ℃, the microstructure undergoes complete recrystallization evolution. An Hall-Petch empirical formula is established between yield strength and grain size. Engineering practice confirms that industrial production annealed at 360 ℃for 8 h can ensure the quality of deep drawing forming.

Key words: Al-3.5Mg alloy, annealing temperature, microstructure, formability

中图分类号:

TG166.3

吴镇宇, 秦颐鸣, 李永弟, 周培林, 周佳菊, 黎渠. 退火温度对拉深成形用Al-3.5Mg合金板材组织与性能的影响[J]. 金属热处理, 2024, 49(6): 29-35.

Wu Zhenyu, Qin Yiming, Li Yongdi, Zhou Peilin, Zhou Jiaju, Li Qu. Effect of annealing temperature on microstructure and mechanical properties of Al-3.5Mg alloy sheet for deep drawing[J]. Heat Treatment of Metals, 2024, 49(6): 29-35.

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退火温度对拉深成形用Al-3.5Mg合金板材组织与性能的影响

Effect of annealing temperature on microstructure and mechanical properties of Al-3.5Mg alloy sheet for deep drawing

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