Al--7Si--0.3Mg铸造合金的旋转弯曲疲劳性能研究

材料研究学报

2012, Vol. 26

Issue (3): 284-288

研究论文

本期目录 | 过刊浏览

Al--7Si--0.3Mg铸造合金的旋转弯曲疲劳性能研究

刘永勤, 介万奇, 王善娜, 罗海军

西北工业大学凝固技术国家重点实验室西安 710072

Investigation of Rotary Bending Gigacycle Fatigue Properties of Al–7Si–0.3Mg Alloys

LIU Yongqin, JIE Wanqi, WANG Shanna, LUO Haijun

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072

引用本文:

刘永勤介万奇王善娜罗海军. Al--7Si--0.3Mg铸造合金的旋转弯曲疲劳性能研究[J]. 材料研究学报, 2012, 26(3): 284-288.
, . Investigation of Rotary Bending Gigacycle Fatigue Properties of Al–7Si–0.3Mg Alloys[J]. Chin J Mater Res, 2012, 26(3): 284-288.

全文: PDF(821 KB)

摘要: 研究了Al--7Si--0.3Mg铸造铝合金的室温旋转弯曲疲劳性能。结果表明, Al--7Si--0.3Mg铸造铝合金在10$^{7}$次疲劳寿命下的极限应力为88 MPa；结合对疲劳试样断口的分析发现, 在高应力低寿命区, Al--7Si--0.3Mg合金试样的表面划痕和缺陷造成了材料的表面破坏模式；而在低应力高寿命区, 试样内部近表面区的铸造孔洞则是引起材料疲劳破坏的主要原因。使用Paris公式推导出孔洞尺寸和疲劳寿命之间的关系, 并计算出不同应力水平条件下的临界孔洞尺寸。

关键词 ：金属材料, Al--7Si--0.3Mg合金, 旋转弯曲疲劳, S--N曲线, 孔洞

Abstract：Rotary bending gigacycle fatigue properties of Al–7Si–0.3Mg alloys were investigated, and the S–N curve and critical stress 88 MPa under fatigue life of 107 cycs were obtained. The results of fracture analysis show that the fatigue fracture mainly occurred at surface flaws or defects in the region of high stress amplitude level, whereas the fatigue fracture mainly occurred at a subsurface porosity in the region of low stress amplitude level. The quantitive relationship between porosity diameter and fatigue life was established and the critical size of porosity on different stress was obtained by using the formula Paris.

Key words： metallic materials Al–7Si–0.3Mg alloy rotary bending gigacycle fatigue S–N curve porosity

收稿日期: 2012-03-23

ZTFLH:

TG113

基金资助:

国家重点基础研究2011CB610403资助项目。

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