Fatigue crack growth behaviors in Al-Si-Mg sand cast alloys

被引：5
|
作者：
Han, SW [1 ]
Kim, SW [1 ]
机构：
[1] Chonbuk Natl Univ, Div Adv Mat Engn, Res Inst Adv Mat Dev, Cheonju 561756, South Korea
来源：
METALS AND MATERIALS INTERNATIONAL | 2004年 / 10卷 / 01期
关键词：
Al-Si-Mg cast alloys; porosity; deflection of fatigue crack; age hardening;
D O I：
10.1007/BF03027358
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The fatigue crack growth behavior of Al-Si-Mg sand cast alloys has been investigated with reference to the effects of solidification structure and aging condition. Fatigue crack growth tests have been carried out under constant load amplitude and a stress ratio of R=0.1 using CT specimens. The amount of pores in the matrix was limited by performing HIP treatment. The pores tended to promote deflection of fatigue cracks, which decreased the fatigue crack growth rate at low DeltaK regions and increased the number of cycles until final fatigue fracture. Refining and spheroidizing of eutectic Si particles increased the fatigue crack growth rates over a wide range of DeltaK up to larger DeltaK values. The difference of aging conditions significantly affected the da/dN-DeltaK(eff) relationship.
引用
收藏
页码：13 / 18
页数：6
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