Study on Interior Fracture Property of High Strength Steel in Very High Cycle Regime

Abstract:

Based on the fracture mechanics theory and fracture surface topography analysis (FRASTA) method, the interior fracture property of a bearing steel in very high cycle regime was studied by means of rotary bending fatigue test. As a result, this bearing steel represents the duplex S-N curves characteristic, where the interior inclusion-induced fracture is the predominant fracture mode in very high cycle regime. The rough granular bright facet (GBF) area corresponding to smaller inclusion is usually formed in the lifetime larger than 106 cycles, whose formation progress can be interpreted as the slow crack nucleation based on decohesion of spherical carbide from the matrix. The fatigue property in the fish-eye region outside of GBF can be interpreted as the stable crack propagation progress and that outside of fish-eye is instable crack propagation progress. The stress intensity factor ranges of GBF and fish-eye, ΔKGBF and ΔKfish-eye, can be regarded as the threshold values of controlling stable propagation and instable propagation of interior crack, respectively.

• Periodical: Advanced Materials Research (Volumes 482-484)
• Pages: 1169-1175
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.482-484.1169
• Online since: February 2012
• Authors: Ren Hao Jiang, Wei Li, Yan Ping Shi, Jiang He
• Keywords: Bearing Steel, Fish-Eye, Granular Bright Facet (GBF), Inclusion, Very High Cycle Fatigue (VHCF)

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