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首页> 外文期刊>Journal of Materials Engineering and Performance >Fatigue of Austempered Ductile Iron with Two Strength Grades in Very High Cycle Regime
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Fatigue of Austempered Ductile Iron with Two Strength Grades in Very High Cycle Regime

机译：极高循环状态下两种强度等级的奥氏体球墨铸铁的疲劳

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摘要

In this study, Austempered ductile irons (ADIs) with two different strength grades were produced and the fatigue properties were measured at 10(9) cycles. The results show that the S-N curves give a typical step-wise shape and there is no fatigue limit in the very high cycle fatigue regime. The two grades ADI have the similar fracture behaviors and fatigue failure can initiate from defects at specimen surface and subsurface zone. On the fracture surfaces of some specimens, the 'granular-bright-facet' area with rich carbon distribution is observed in the vicinity of the defect. The microstructure affects the crack behaviors at the early propagation stage. The ADI with upper and lower bainite shows higher fatigue strength compared with the ADI with coarse upper bainite.
机译：在这项研究中，生产了两种不同强度等级的奥氏体球墨铸铁（ADIs），并在10（9）个循环下测量了疲劳性能。结果表明，S-N曲线具有典型的逐步形状，并且在极高的循环疲劳状态下没有疲劳极限。两种等级的ADI具有相似的断裂行为，疲劳破坏可能是由于试样表面和地下区域的缺陷引起的。在一些样品的断裂表面上，在缺陷附近观察到了具有丰富碳分布的“颗粒-亮面”区域。微观结构影响早期扩展阶段的裂纹行为。与上，下贝氏体的ADI相比，上，下贝氏体的ADI具有更高的疲劳强度。

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