Simulation of the Fatigue Crack Initiation in SAE 52100 Martensitic Hardened Bearing Steel during Rolling Contact
Simulation of the Fatigue Crack Initiation in SAE 52100 Martensitic Hardened Bearing Steel during Rolling Contact
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DOI：
10.3390/lubricants10040062
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发表时间：
2022-04-01
期刊：
影响因子：
3.5
通讯作者：
Wranik, Juergen
中科院分区：
文献类型：
--
作者：
Dogahe, Kiarash Jamali;Guski, Vinzenz;Wranik, Juergen
对轴承应用中的一种严重损伤模式——白腐蚀裂纹（WEC）现象进行了研究，发现在潜在的预损伤状态阶段，滚道表面出现了明显的变化。对变化下微观结构的详细检查显示，在80 μ m至200 μ m的深度范围内存在大量纳米级孔隙。计算出最大赫兹应力深度为地下127 μ m。研究了这些纳米孔对sae52100马氏体淬火轴承钢疲劳裂纹萌生的影响。在这种意义上，用有限元方法（FEM）对有孔和无孔试样建立了两种微观模型。使用基于物理的Tanaka-Mura模型，计算了两个样品裂纹萌生所需的循环次数。结果表明，孔隙显著减少了轴承应用过程中的循环次数，使微观组织短裂纹（MSC）向长裂纹（LC）的扩展提前过渡。
An investigation on the White Etching Crack (WEC) phenomenon as a severe damage mode in bearing applications led to the observation that in a latent pre-damage state period, visible alterations appear on the surface of the raceway. A detailed inspection of the microstructure underneath the alterations reveals the existence of plenty of nano-sized pores in a depth range of 80 mu m to 200 mu m. The depth of the maximum Hertzian stress is calculated to be at 127 mu m subsurface. The present study investigates the effect of these nanopores on the fatigue crack initiation in SAE 52100 martensitic hardened bearing steel. In this sense, two micro-models by means of the Finite Element Method (FEM) are developed for both a sample with and a sample without pores. The number of cycles required for the crack initiation for both samples is calculated, using the physical-based Tanaka-Mura model. It is shown that pores reduce the number of cycles in bearing application to come to an earlier transition from microstructural short cracks (MSC) to long crack (LC) propagation significantly.