搅拌摩擦修复2A12铝合金的疲劳性能和裂纹扩展行为

中国机械工程

搅拌摩擦修复2A12铝合金的疲劳性能和裂纹扩展行为

王磊1,2;单勇峰1;任俊刚3;回丽1,2;周松2

1.沈阳航空航天大学机电工程学院，沈阳,110136
2.沈阳航空航天大学航空制造工艺数字化国防重点学科实验室，沈阳,110136
3.东北大学机械工程与自动化学院，沈阳,110004

出版日期:2017-07-10 发布日期:2017-07-10
基金资助:
国家自然科学基金资助项目(51405309)；
辽宁省自然科学基金资助项目(2015020183)
National Natural Science Foundation of China （No. 51405309）
Liaoning Provincial Natural Science Foundation of China （No. 2015020183）

Fatigue Properties and Crack Propagation Behaviour of Friction Stir Crack Repaired 2A12 Aluminum Alloy

WANG Lei1,2;SHAN Yongfeng2;REN Jungang3;HUI Li1,2;ZHOU Song2

1.Department of Electromechanical Engineering, Shenyang Aerospace University, Shenyang,110136
2.Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University,Shenyang,110136
3.Department of Mechanical Engineering and Automation, Northeastern University, Shenyang,110004

Online:2017-07-10 Published:2017-07-10
Supported by:
National Natural Science Foundation of China （No. 51405309）
Liaoning Provincial Natural Science Foundation of China （No. 2015020183）

摘要/Abstract

摘要： 对含预制裂纹的2A12铝合金板进行搅拌摩擦修复试验，并对修复后的试样进行热处理。对修复试样与修复后热处理试样分别进行疲劳寿命与裂纹扩展试验，研究其疲劳性能的变化。结果表明:热处理可使修复试样疲劳寿命延长34.79%，修复试样与修复后热处理试样分别达到母材寿命的36.98%和49.89%，裂纹扩展速率均比母材的快，但修复后热处理试样裂纹扩展速率较修复试样低。疲劳断口显示，母材裂纹源多萌生于表面或亚表面夹杂相，修复试样与修复后热处理试样裂纹源多萌生于修复区和母材的界面，且裂纹源通常不止一处。稳定扩展区修复试样的修复区没有河流花样的解理面，而热处理后试样出现与母材类似的致密紧凑疲劳条带。修复试样瞬断区中由大量细小的等轴韧窝组成，而修复后热处理试样韧窝大小不等，但分布均匀。

关键词: 搅拌摩擦裂纹修复, 疲劳, 裂纹扩展, 热处理, 断口

Abstract: The friction stir repaired experiments were conducted on pre-cracked 2A12 aluminum alloy plates, and the samples were heat-treated after repairing. The tests of fatigue life and crack propagation were carried out respectively on the repaired specimens and the heat-treated specimens to study the changes of the fatigue performance. The results show that the fatigue life of repaired specimens after heat-treatment increases by 34.79%. Fatigue lives of repaired and heat-treated specimens account for 36.98% and 49.89% of the base metals. The crack growth rates of repaired specimens are higher than that of base metals, and the heat treatment may reduce the crack growth rates of repaired specimens. Fatigue fractures show that crack sources of the base metals mostly initiate at the surfaces or sub-surfaces, but the crack sources of repaired and heat-treated specimens mainly initiate at the boundaries between the repaired zones and base metals, and more than one crack sources are found. There are no cleavage river patterns in repaired zones of repaired specimens, however, the dense and compact fatigue striations may be found, which are similar to the base metals. The repaired specimens are composed of massive little equiaxed dimples in finial fracture zones, while for the repaired specimens after heat-treatments, the dimples are different in sizes but distribute uniformly.

Key words: friction stir crack repairing, fatigue（FSCR）, crack propagation, heat-treatment, fracture surface

中图分类号:

TG453

王磊1,2;单勇峰1;任俊刚3;回丽1,2;周松2. 搅拌摩擦修复2A12铝合金的疲劳性能和裂纹扩展行为[J]. 中国机械工程.

WANG Lei1,2;SHAN Yongfeng2;REN Jungang3;HUI Li1,2;ZHOU Song2. Fatigue Properties and Crack Propagation Behaviour of Friction Stir Crack Repaired 2A12 Aluminum Alloy[J]. China Mechanical Engineering.

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