Effect of Shot Peening Intensity on Rolling Contact Fatigue Life of High Carbon Chromium Steel

Author:  Chung-Ki Sim, Sunghun Oh, Hong-Seok Kim, Ki-Hoon Shin, Seong-Kyun Cheong
Source:  ICSP-13
Doc ID:  2017081
Year of Publication:  2017
Abstract:  
Introduction: Rolling contact fatigue (RCF) is a major failure element of bearings. RCF life can be influenced by several parameters including contact pressure, lubricant condition, and surface condition [1, 2]. As higher lifetime is needed, some of researchers has investigated the effects of shot peening on rolling contact fatigue life [3-6]. Shot peening is a surface treatment technique by projecting shot balls on the surface of the material. This process is reported as an effective way to increase a rolling contact fatigue life by generating compressive residual stress [3], increasing surface hardness [3, 4], and changing microstructures [5]. However, the surface roughness induced by shot peening process may reduce the rolling contact fatigue life [3, 6]. In this study, the effect of shot peening intensity on the rolling contact surface and the rolling contact fatigue life of high carbon chromium steel is investigated. Impeller type of shot peening equipment was used for the shot peening process. Two disk type of specimens with Almen intensity 0.224mmA and 0.580mmA, respectively, were prepared for the rolling contact fatigue test.