7系铝合金在上海轨道交通车辆的应用现状及适用性分析
顾恺迪1高志良1李世江2高伟民1
Application Status and Adaptability Analaysis of 7 Series Aluminum Alloy in Shanghai Rail Transit Vehicle
GU KaidiGAO ZhiliangLI ShijiangGAO Weimin
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作者信息:1.1. 上海地铁维护保障有限公司车辆分公司，200030，上海；
2.2. 上海地铁维护保障有限公司，200070，上海
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Affiliation:Rolling Stock Branch of Shanghai Metro Maintenance Support Co., Ltd., 200030, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.09.028
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中图分类号/CLCN:U270.4+1
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栏目/Col:研究报告
摘要:
针对上海轨道交通车辆现有的裂纹情况统计，发现7系铝合金部件为裂纹高发位置。通过研究分析发现，7系铝合金组织结构与成分构成对层状撕裂与应力腐蚀效应的高敏感性导致裂纹的形成。在此基础上，对7系铝合金的适用性进行评价，并提出采用喷丸强化工艺及焊接工艺评定的方式，优化7系铝合金在车体关键位置的使用。
Abstracts:
According to the statistics of existing cracks on Shanghai rail transit vehicle body, it is found that the 7-series aluminum alloy components are the high-incidence locations of cracks. Research and analysis discover that the high sensitivity of the organizational structure and composition of the 7 series aluminum alloy against the effects of lamellar tearing and stress corrosion leads to the formation of cracks. On this basis, the applicability of the 7-series aluminum alloy is evaluated, and the method of shot peening and welding process evaluation is proposed to optimize the use of 7 series aluminum alloys in key positions of the train body.
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