锻压技术

5083P-O铝合金板材腐蚀疲劳性能研究

英文标题：Research on corrosion fatigue performances of 5083P-O aluminium alloy sheet

单位：河北建筑工程学院北京航空航天大学中车青岛四方机车车辆股份有限公司张家口卷烟厂有限责任公司安徽埃克索医疗机器人有限公司

分类号：TG115.57

出版年,卷(期):页码：2019,44(9):141-145

摘要：

以5083P-O铝合金板材为研究对象，对5083P-O铝合金板材在20～25 ℃的3.5% NaCl溶液中进行腐蚀疲劳试验, 得到横向和纵向106循环下的腐蚀疲劳性能，并对试验数据进行数据处理，采用最小二乘法拟合，最终得到5083P-O铝合金板材横向和纵向腐蚀疲劳S-N曲线。横向与纵向S-N曲线表明，板材纵向腐蚀疲劳极限高于横向腐蚀疲劳极限。借助SEM扫描电镜分析断裂腐蚀疲劳断口微观组织，结果表明，引起铝合金板材腐蚀疲劳断裂的原因为：腐蚀液对5083P-O铝合金试样表面造成化学腐蚀，产生腐蚀坑，腐蚀疲劳裂纹从金属表面点蚀坑生成，进而经历扩展及快速扩展阶段，直至断裂。

For 5083P-O aluminum alloy sheet, the corrosion fatigue test of 5083P-O aluminum alloy sheet in 3.5% NaCl solution at 20-25 ℃was conducted, and the corrosion fatigue performances in the transverse and longitudinal directions with 106 cycles were obtained respectively. Then, the test data were processed and fitted by the least square method，and finally the S-N curves of transverse and longitudinal corrosion fatigue for 5083P-O aluminium alloy sheet were obtained. However, the transverse and longitudinal S-N curves indicate that the longitudinal corrosion fatigue limit of sheet is higher than the transverse corrosion fatigue limit. Furthermore, the microstructure of fatigue fracture was analyzed by SEM. The results show that the cause of corrosion fatigue fracture of aluminum alloy sheet is that the corrosive solution causes chemical corrosion on the surface of 5083P-O aluminum alloy specimen resulting in corrosion pits，the corrosion fatigue cracks are generated from the pits on metal surface, and then undergo expansion and rapid expansion until fracture.

基金项目：

国家自然科学基金资助项目（51375500）；河北省自然科学基金资助项目（F201904029）；河北省高等学校科学技术研究青年基金项目（QN2018013,QN2019208）； 2017年河北省省级科技计划自筹经费项目（17211828）；2018年度张家口市科技计划财政资助项目（1811009B-10）；2018年度张家口市科技计划财政资助项目（1811009B-12）；河北建筑工程学院教师发展专项（2018SJ1002）；河北建筑工程学院教学改革研究项目（2018JY0005）

马立勇（1987-），男，硕士，讲师 E-mail：maliyongmail@foxmail.com 通讯作者：宋明星（1983-），男，硕士，讲师 E-mail：113711081@csu.edu.cn

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