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首页> 外文期刊>Journal of Materials Engineering and Performance >Analysis on the Fatigue Properties of Shot-Peened Al-Si-Mg Alloy and Its Fatigue Life Prediction
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Analysis on the Fatigue Properties of Shot-Peened Al-Si-Mg Alloy and Its Fatigue Life Prediction

机译：射击膨胀Al-Si-Mg合金疲劳性能分析及其疲劳寿命预测

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摘要

Ceramic micro-shot peening (CMSP) and steel micro-shot peening (SMSP) were utilized to investigate the effect of micro-shot peening (MSP) on the high-cycle fatigue properties of Al-7Si-0.3Mg casting aluminum alloy in a previous study. However, the improvement effects of CMSP and SMSP on the fatigue strength (at 5 x 10(7)cycles) were only 33% because the depth of harden layers was only 20 and 55 mu m while the depth of compressive residual stress affected layers was only 37 and 68 mu m. In this study, conventional shot peening (CSP) was utilized, and the results were compared with those of MSP, with the expectation that CSP would provide a greater improvement in the fatigue strength. The affected surface layers of the shot-peened specimens were characterized using surface morphology, microhardness, and residual stress analyses. In addition, the effect of CSP on the fatigue strength at 5 x 10(7)cycles was investigated using a rotating bending fatigue test (R = - 1). An investigation of the extensive surface compressive residual stress relaxation process for the three different shot-peened specimens during cyclic loading was conducted using x-ray diffraction. In addition, the initiation sites for fatigue cracks on the fracture surface were observed using scanning electron microscopy. Furthermore, the fatigue life of the samples with the internal casting defect failure mode was predicted using linear elastic fracture mechanics, while that for samples with the surface crack initiation failure mode was predicted using the modified Morrow model considering the residual stress.
机译：利用陶瓷微射击喷丸（CMSP）和钢微粒喷丸（SMSP）来探讨微粉喷丸（MSP）对AL-7SI-0.3mg铸造铝合金的高循环疲劳性能的影响以前的研究。然而，CMSP和SMSP对疲劳强度的改善效果（5×10（7）个循环）仅为33％，因为硬质层的深度仅为20且55μm，而受压残余应力影响层的深度是只有37和68亩。在该研究中，使用常规的射击喷丸（CSP），并将结果与​​MSP的结果进行比较，期望CSP将提供更大的疲劳强度的提高。使用表面形态，微硬度和残余应力分析表征射击喷丸样本的受影响的表面层。另外，使用旋转弯曲疲劳试验研究（R = -1），研究了CSP对5×10（7）次循环处的疲劳强度的影响。使用X射线衍射进行循环载荷期间三种不同喷丸试样的广泛表面压缩残余应力松弛过程的研究。另外，使用扫描电子显微镜观察裂缝表面上的疲劳裂缝的起始位点。此外，使用线性弹性断裂力学预测样品的疲劳寿命具有内部铸造缺陷失效模式，而考虑到残余应力，预测了用于具有表面裂纹起始失效模式的样品的样品。

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