Improvement of High Cycle Fatigue Properties by HIP Treatment for Cast Alminum Alloys
Improvement of High Cycle Fatigue Properties by HIP Treatment for Cast Alminum Alloys
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通过 HIP 处理改善铸造铝合金的高周疲劳性能
DOI：
10.1299/kikaia.61.2342
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
R. Shibata
中科院分区：
文献类型：
--
作者：
M. Kubota;Y. Ochi;A. Ishii;R. Shibata
对三种铸造铝合金经热等静压（HIP）处理后进行旋转弯曲疲劳试验。进行HIP处理是为了减少铸造铝合金的铸造缺陷和孔隙率。 HIP处理的效果因材料而异，但处理最有效的材料AC4CH的疲劳强度显着提高。在HIP处理的AC4CH中，疲劳裂纹萌生部位不是铸造缺陷，而是具有高密度共晶硅颗粒的试样表面的一部分。将 HIP 处理的 AC4CH 与传统的 AC4CH 进行比较，两者的裂纹扩展行为相同，但前者的裂纹萌生寿命比后者更长。考虑裂纹萌生和裂纹扩展的寿命，成功评估了疲劳寿命。这里，裂纹萌生寿命被定义为涉及裂纹萌生后立即的分散，并且对于HIP处理材料和常规材料，裂纹扩展寿命以一种关系表示。
Rotating bending fatigue tests were carried out on three kinds of cast aluminum alloys after hot isostatic pressing (HIP) treatment. The HIP treatment was carried out to reduce cast defects and porosity of cast aluminum alloys. Efficacy of HIP treatment varied from material to material, but in the material which treatment was most effective, namely AC4CH, the fatigue strength was markedly improved. In the HIP-treated AC4CH, the fatigue crack initiation site was not a cast defect but a part of the specimen surface with a high density of eutectic silicon particles. Comparing the HIP-treated AC4CH with conventional AC4CH, crack propagation behavior was the same for both, but crack initiation life was longer for the former than the latter. Fatigue life was successfully evaluated considering lives of both crack initiation and crack propagation. Here, the crack initiation life was defined as involving scatter immediately after crack initiation, and the crack propagation life was expressed in one relation for the HIP-treated materials and the conventional material.