锻压技术

轨道车辆用6082-T6铝合金腐蚀疲劳性能研究

英文标题：Study on corrosion fatigue properties of 6082-T6 aluminum alloy for railway vehicles

关键词：6082-T6铝合金腐蚀疲劳 S-N曲线断裂

分类号：TG146.2；TG133+4

出版年,卷(期):页码：2021,46(5):228-233

摘要：

以轨道车辆常用6082-T6铝合金为研究对象，通过3.5%NaCl溶液下的腐蚀疲劳试验，获取应力比R=0条件下横、纵向试样的应力-循环次数关系，通过最小二乘法数据处理，求得在50%置信度和50%可靠度下6082-T6铝合金板材的横、纵向腐蚀疲劳S-N曲线，并进行断口扫描，分析腐蚀疲劳断裂原因。结果表明，6082-T6铝合金板材横、纵向腐蚀疲劳极限分别为157和153 MPa，其横向性能略优于纵向性能。断口SEM微观组织分析表明，铝合金板材在腐蚀溶液的作用下产生点蚀坑，导致应力集中，继而发生疲劳裂纹扩展，在初始扩展区出现泥状花样形貌，出现二次裂纹及疲劳辉纹，直至疲劳瞬断。

For 6082-T6 aluminum alloy commonly used in rail vehicles, the relationship between stress and cycle number for the transverse and longitudinal specimens under the condition of the stress ratio R=0 was obtained by the corrosion fatigue test in 3.5% NaCl solution, and the data was processed by the least square method. Then, the transverse and longitudinal corrosion fatigue S-N curves of 6082-T6 aluminum alloy sheet were obtained under the confidence of 50% and the reliability of 50%, and the fracture was observed to analyze the cause of corrosion fatigue fracture. The results show that the transverse and longitudinal corrosion fatigue limits of 6082-T6 aluminum alloy sheet are 157 and 153 MPa, respectively, and the transverse performance is slightly better than the longitudinal performance. Furthermore, the SEM microstructure analysis of fracture shows that the aluminum alloy sheet produces pitting pits under the action of corrosive solution, which leads to stress concentration, and then fatigue crack propagation. The mud-like pattern morphology, the secondary cracks and the fatigue lines appear in the initial expansion zone, until the fatigue instantaneous failure.

基金项目：

国家重点研发计划资助项目（2017YFB0202804）；国家自然科学基金资助项目(51375500)；河北省高等学校科学技术研究青年基金项目（QN2018013）；张家口市科学技术研究与发展指令计划项目（1911031A）；中国建设教育协会教育教学科研课题（2019101）

孙晓红（1988-），男，硕士，工程师 E-mail：sunxiaohong.sf@crrcgc.cc 通讯作者：马立勇（1987-），男，博士研究生，讲师 E-mail：maliyong0001@foxmail.com

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