Transactions of Materials and Heat Treatment

Title：Study on corrosion fatigue properties of 6082-T6 aluminum alloy for railway vehicles

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ClassificationCode：TG146.2；TG133+4

year,vol(issue):pagenumber：2021,46(5):228-233

Abstract：

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.

Funds：

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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