High Cycle Fatigue Strength and Fatigue Crack Properties of Semi-Liquid Die Casting Aluminum Alloys.
High Cycle Fatigue Strength and Fatigue Crack Properties of Semi-Liquid Die Casting Aluminum Alloys.
复制标题
半液态压铸铝合金的高周疲劳强度和疲劳裂纹性能。
DOI：
10.1299/kikaia.66.1703
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
R. Shibata
中科院分区：
文献类型：
--
作者：
Y. Ochi;A. Hatakeyama;T. Matsumura;R. Shibata
对半液态压铸铝合金进行了旋转弯曲疲劳试验。与常规铸造相比，半液态压铸可减少铸造缺陷和气孔，并可实现结构尺寸的小型化，从而有望提高半液态压铸铝合金的疲劳寿命。疲劳裂纹的萌生位置与铸造缺陷和共晶硅颗粒交替出现。裂纹萌生寿命随裂纹萌生位置的不同而不同，裂纹扩展特性取决于共晶硅粒子的形态和分布。因此，铝合金的疲劳强度依次高于从共晶硅颗粒开裂的半液态压铸材料、从孔隙开裂的相同材料和常规压铸材料（AC 4CH）。结果表明，对于铝合金，由裂纹萌生寿命和裂纹扩展寿命估算其疲劳寿命，所得疲劳寿命预测值与试验值吻合较好。
Rotating bending fatigue tests were carried out on semi-liquid die casting aluminum alloys. Compared with the conventional casting, the semi-liquid die casting could reduce cast defects and porosities of casting aluminum alloys, and could miniatureize structrue size, therefore fatigue life of semi-liquid die casting aluminum alloys were expected to be improved. And fatigue crack initiation sites were alternative of cast defects and eutectic silicon particles. According to crack initiation sites, the crack initiation life varied, and crack propagation property depended on the form and the distribution of eutectic silicon particles. Therefore the fatigue strength of aluminum alloys was higher in turn of the semi-liquid die cast material that cracked from eutectic silicon particles, the same material that cracked from porosity and the conventional die cast material (AC 4CH). As a result, as to aluminum alloys, the fatigue life was estimated from the crack initiation life and the crack propagation life, and obtained fatigue life prediction gave good agreement with the experiment value.