热挤压工艺对7N01铝合金型材组织和疲劳行为的影响

doi:10.13251/j.issn.0254-6051.2024.10.017

金属热处理 ›› 2024, Vol. 49 ›› Issue (10): 105-109.DOI: 10.13251/j.issn.0254-6051.2024.10.017

热挤压工艺对7N01铝合金型材组织和疲劳行为的影响

宋丰轩¹, 莫宇飞², 刘世通³

1.广西电力职业技术学院建筑工程学院, 广西南宁 530006;
2.广西南南铝加工有限公司, 广西南宁 530031;
3.北部湾大学建筑工程学院, 广西钦州 535011

收稿日期:2024-04-22 修回日期:2024-08-09 出版日期:2024-11-28 发布日期:2024-11-28
作者简介:宋丰轩(1981—),男,高级工程师,博士,主要研究方向为铝合金加工及热处理,E-mail: 258481894@qq.com
基金资助:
广西高校中青年教师(科研)基础能力提升项目(2020KY10017);北部湾大学高层次人才科研启动项目(2019KYQD21)

Effect of hot extrusion process on microstructure and fatigue behavior of 7N01 aluminum alloy profiles

Song Fengxuan¹, Mo Yufei², Liu Shitong³

1. College of Civil Engineering and Architecture, Guangxi Electrical Polytechnic Institute, Nanning Guangxi 530006, China;
2. GuangxiAlnan Aluminum Inc., Nanning Guangxi 530031, China;
3. College of Civil Engineering and Architecture,Beibu Gulf University, Qinzhou Guangxi 535011, China

Received:2024-04-22 Revised:2024-08-09 Online:2024-11-28 Published:2024-11-28

摘要/Abstract

摘要： 通过高温压缩试验和金相观察研究了变形温度和变形速率对7N01铝合金微观组织的影响。在此基础上,制定挤压工艺参数,通过扫描电镜背散射衍射技术和疲劳试验升降法对不同挤压工艺下的T5态7N01铝合金型材的微观组织和疲劳性能进行观察和测试。结果表明,高温压缩变形过程中合金会发生动态回复和动态再结晶,随着变形温度的升高,合金中动态再结晶程度增加;随着变形速率的增加,合金中动态回复不及时、位错密度急剧增加,导致动态再结晶程度先减小后增加。挤压过程中,增加挤压温度和挤压速率,7N01-T5型材内再结晶分数均增加,导致型材中值疲劳强度减小。但当挤压温度为485 ℃、挤压速率为1.0 m/min时,型材内再结晶晶粒和亚晶呈宽大的层状交替排列,可有效抑制疲劳裂纹的扩展,合金的疲劳强度最大。

关键词: 7N01铝合金型材, 挤压工艺, 微观组织, 疲劳行为

Abstract: Effects of deformation temperature and deformation rate on microstructure of the 7N01 aluminum alloy were studied through high-temperature compression test and metallographic observation. Based on these studies, extrusion process parameters were formulated, and the microstructure and fatigue properties of the T5-state 7N01 aluminum alloy profiles under different extrusion processes were observed and tested by using scanning electron microscope (SEM) backscattered diffraction technology and fatigue test lifting method. The results indicate that the alloy undergoes dynamic recovery and recrystallization during high-temperature compression. And with the increase of deformation temperature, the degree of dynamic recrystallization in the alloy increases. Meanwhile, with the increase of the deformation rate, the dislocation density of the alloy increases sharply, but the dynamic recovery in the alloy is impeded, which resulting in the degree of dynamic recrystallization decreasing first and then increasing. During extrusion, increasing the extrusion temperature and extrusion rate results in an increase in the recrystallization fraction within the 7N01-T5 profile, leading to a decrease in the median fatigue strength of the profile. However, when the extrusion temperature is 485 ℃ and the extrusion rate is 1.0 m/min, the recrystallized grains and subgrains within the profile are alternately arranged in a wide layered structure, effectively inhibiting the propagation of fatigue cracks, and the fatigue strength of the alloy reaches maximum.

Key words: 7N01 aluminum alloy profile, extrusion process, microstructure, fatigue behavior

中图分类号:

TG376.2

宋丰轩, 莫宇飞, 刘世通. 热挤压工艺对7N01铝合金型材组织和疲劳行为的影响[J]. 金属热处理, 2024, 49(10): 105-109.

Song Fengxuan, Mo Yufei, Liu Shitong. Effect of hot extrusion process on microstructure and fatigue behavior of 7N01 aluminum alloy profiles[J]. Heat Treatment of Metals, 2024, 49(10): 105-109.

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热挤压工艺对7N01铝合金型材组织和疲劳行为的影响

Effect of hot extrusion process on microstructure and fatigue behavior of 7N01 aluminum alloy profiles

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