微观孔洞对铝合金压铸件疲劳性能的影响

被引：11

作者：

万谦

赵海东

葛继龙

机构：

[1] 华南理工大学国家金属材料近净成形工程技术研究中心

来源：

中国有色金属学报 | 2015年 / 25卷 / 03期

关键词：

铝合金; 高压压铸; 微观孔洞; 疲劳; 三维X射线断层扫描; 有限元分析;

D O I：

10.19476/j.ysxb.1004.0609.2015.03.003

中图分类号：

TG146.21 []; TG115 [金属的分析试验（金属材料试验）];

学科分类号：

080502 ;

摘要：

基于高分辨率三维X射线断层扫描技术,对实际ADC12铝合金压铸件疲劳试样内部微观孔洞进行了检测和重构,对7组不同孔隙率的试样进行了5级应力水平的高周疲劳实验。三参数Weibull分析表明:随着应力水平升高,疲劳寿命分散性逐渐降低。采用SEM观察疲劳断口,确定诱发疲劳裂纹起源的孔洞,并对其进行了分析;基于断口表面的孔洞特征以及X射线断层扫描重构数据,建立了孔洞-疲劳寿命预测方程,并与实验结果进行了对比分析。将三维X射线断层扫描重构数据与有限元分析相结合,计算和分析了实际微观孔洞引起的应力情况,为研究材料内部实际微观孔洞特征对性能的影响提供新的途径。

引用

页码：568 / 574

页数：7

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