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Study of the effect of microstructure heterogeneity on fatigue crack propagation of low-alloyed PM steels

机译：显微组织异质性对低合金永磁钢疲劳裂纹扩展影响的研究

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摘要

Powder metallurgy steels frequently withstand cyclic loading in service. Therefore, it is of high importance to thoroughly understand their fatigue properties. A detailed study of the effect of micro-structure heterogeneity on fatigue properties of sinter-hardened PM steels was performed using admixed nickel PM steels (FN0208) as well as pre-alloyed PM steels (FL5208). Specimens were pressed and sintered to a density of 7.3 g/cm~3 in order to specifically investigate the effect of microstructural constituents on fatigue properties. Fatigue crack growth rates were measured at four different R-ratios, 0.1, 0.3, 0.5 and 0.7 for both PM steels. The negative effect of increasing the R-ratio on fatigue properties was observed for both alloys. The crack propagation paths were studied using optical microscopy and the tortuosity of the crack paths were compared with their equivalent linear paths. This approach allowed us to determine the effect of microstructure in different fatigue conditions. Fatigue fracture surfaces were also studied using scanning electron microscopy.
机译：粉末冶金钢在使用中经常承受循环载荷。因此，全面了解它们的疲劳性能具有非常重要的意义。使用混合镍PM钢（FN0208）和预合金PM钢（FL5208）对微观结构异质性对烧结硬化PM钢疲劳性能的影响进行了详细研究。压制并烧结样品至密度为7.3 g / cm〜3，以专门研究微观结构成分对疲劳性能的影响。两种PM钢在四种不同的R比值（分别为0.1、0.3、0.5和0.7）下测量了疲劳裂纹扩展速率。两种合金均观察到增加R比对疲劳性能的负面影响。使用光学显微镜研究了裂纹的传播路径，并将裂纹路径的曲率与其等效线性路径进行了比较。这种方法使我们能够确定不同疲劳条件下的微观结构影响。还使用扫描电子显微镜研究了疲劳断裂表面。

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