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Degradation of nanostructured bainitic steel under rolling contact fatigue

机译：滚动接触疲劳下纳米贝氏体钢的降解

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摘要

The consequences of rolling contact fatigue on a carbide-free nanostructured bainitic steel intended for bearing applications are presented for the first time. Tests performed at various intervals followed by mechanical, microscopical, and crystallographic characterization lead to the conclusion that the degradation mechanism is ductile void formation at interfaces, followed by growth and coalescence into larger voids that lead to fracture along the direction of the softer phase. This is different from the conventional damage mechanism that involves crack initiation at inclusions and propagation, for example in typical bearings steels such as 52100. The huge density of interfaces in the nanostructure allows the formation of a large dispersion of voids, and ultimately cracks, at depths consistent with the maximum orthogonal shear stress below the contact surface. This study should prove useful for the eventual usage of nanostructured bainitic steels in rolling bearings.
机译：首次提出了用于轴承应用的无碳化物纳米贝氏体钢上滚动接触疲劳的后果。在不同的时间间隔进行测试，然后进行机械，微观和晶体学表征，得出的结论是，降解机理是在界面处形成延性孔隙，然后生长并聚集成更大的孔隙，导致沿软相方向断裂。这与传统的破坏机制不同，后者涉及在夹杂物处发生裂纹并扩展裂纹的蔓延，例如在典型的轴承钢（如52100）中。纳米结构中巨大的界面密度允许形成大量的空隙，最终形成裂纹。深度与接触面下方的最大正交切应力一致。这项研究对于最终在滚动轴承中使用纳米贝氏体钢应被证明是有用的。

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