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首页> 外文期刊>Journal of Materials Engineering and Performance >Estimation of early fatigue damage in heat treated En-8 Grade steel
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Estimation of early fatigue damage in heat treated En-8 Grade steel

机译：热处理的En-8级钢的早期疲劳损伤评估

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摘要

Generally, the failure of major machinery parts is due to fatigue damage. Because of the structural inhomogeneity of metals, fatigue damage may sometimes occur significantly below the yield strength of the material due to microplastic deformationat low stress levels. Commercial En-8 grade steel (widely used for making secondary metalworking products) was used to estimate the fatigue damage response during cyclic loading nearer to the fatigue endurance limit. Estimation of fatigue damage wascarried out with the aid of a nondestructive testing (NDT) method, that is, Elastosonic measurement of fatigue damping coefficient and slope of fatigue damping curves. Results indicate that fatigue damage increases in annealed En-S steel with an increasein peak stress and with an increase in the number of cycles. However, for hardened and tempered En-S steel, experimental results may not provide a true indication of fatigue damage during fatigue loading nearer to the endurance limit, most likely due tothe more homogeneous structure. Generally, fatigue failure occurs in this grade of steel due to microcrack generation in the cementite of the pearlite phase of annealed steel.
机译：通常，主要机械零件的故障是由于疲劳损坏造成的。由于金属的结构不均匀性，在低应力水平下，由于微塑性变形，有时会在低于材料的屈服强度以下时发生疲劳破坏。使用商业化的En-8级钢（广泛用于制造次要金属加工产品）来估算循环载荷下接近疲劳极限的疲劳损伤响应。疲劳损伤的估计是借助无损检测（NDT）方法进行的，即弹性阻尼系数和疲劳阻尼曲线斜率的弹性测量。结果表明，随着峰值应力的增加和循环次数的增加，退火的En-S钢的疲劳损伤也会增加。但是，对于淬火和回火的En-S钢，实验结果可能无法提供疲劳载荷接近耐久性极限时疲劳损伤的真实指示，这很可能是由于结构更加均匀。通常，由于在退火钢的珠光体相的渗碳体中产生微裂纹，在这种等级的钢中发生疲劳破坏。

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