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首页> 外文会议>Eighth International Fatigue Congress Vol.5, Jun 3-7, 2002, Stockholm, Sweden >TOPOGRAPHIC ANALYSIS FOR SUBSURFACE CRACK INITIATION AND PROPAGATION OF HIGH STRENGTH STEEL IN GIGACYCLE FATIGUE
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TOPOGRAPHIC ANALYSIS FOR SUBSURFACE CRACK INITIATION AND PROPAGATION OF HIGH STRENGTH STEEL IN GIGACYCLE FATIGUE

机译：超高强度疲劳裂纹亚表面裂纹萌生和扩展的断层分析

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摘要

Fatigue failure can occur at small internal defects in subsurface zones of a material, especially high-strength steels and casehardened steels. Subsurface crack initiation is dominant at low stress amplitudes and high number of cycles, while surface fatigue crack initiation occurs at high stress amplitudes and low cycles. The aim of this study is to clarify the subsurface fatigue crack initiation and propagation behavior of high-strength steel, especially mechanisms for the formation of the granular-bright-facet (GBF) area. The fracture surface topographic analysis (FRASTA) was made for subsurface crack initiated specimen using the topographic data obtained by a three-dimensional SEM analysis. From the computational simulation of the fatigue fracture process, it was observed that some microcracks initiate around a non-metallic inclusion inside the GBF area and coalesce each other during fatigue process. We propose a mechanism for the formation of the GBF area under the discussion of the microstructure of the material.
机译：在材料（尤其是高强度钢和表面硬化钢）的次表面区域中，如果内部缺陷较小，就会发生疲劳破坏。在低应力幅值和高循环次数下，次表面裂纹萌生占主导地位，而在高应力幅值和低循环次数下，表面疲劳裂纹萌生发生。这项研究的目的是弄清高强度钢的表面疲劳裂纹萌生和扩展行为，尤其是形成粒状亮面（GBF）区域的机制。使用通过三维扫描电镜分析获得的形貌数据，对地下裂纹引发的试样进行了断裂表面形貌分析（FRASTA）。从疲劳断裂过程的计算模拟中，可以观察到在GBF区域内的非金属夹杂物周围会引发一些微裂纹，并且在疲劳过程中会彼此结合。在讨论材料的微观结构后，我们提出了形成GBF区域的机制。

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