Journal ArticleDOI
Influence of Residual Stress and Temperature on the Cyclic Hardening Response of M50 High-Strength Bearing Steel Subjected to Rolling Contact Fatigue
TLDR
In this article, microstructural and mechanical characterization of a through-hardened M50 bearing steel is presented to compare and contrast their performances under rolling contact fatigue (RCF) loading.Abstract:
Microstructural and mechanical characterization investigations on three variants of a through-hardened M50 bearing steel are presented to compare and contrast their performances under rolling contact fatigue (RCF) loading. Baseline (BL) variant of M50 steel bearing balls is subjected to: (i) a surface nitriding treatment and (ii) a surface mechanical processing treatment, to obtain distinct microstructures and mechanical properties. These balls are subjected to RCF loading for several hundred million cycles at two different test temperatures, and the subsequent changes in subsurface hardness and compressive stress–strain response are measured. It was found that the RCF-affected subsurface regions grow larger in size at higher temperature. Micro-indentation hardness measurements within the RCF-affected regions revealed an increase in hardness in all the three variants. The size of the RCF-affected region and intensity of hardening were the largest in the BL material and smallest in the mechanically processed (MP) material. Based on Goodman's diagram, it is shown that the compressive residual stress reduces the effective fully reversed alternating stress amplitude and thereby retards the initiation and evolution of subsurface plasticity within the material during RCF loading. It is quantitatively shown that high material hardness and compressive residual stress are greatly beneficial for enhancing the RCF life of bearings.read more
Citations
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White etching matter promoted by intergranular embrittlement
TL;DR: In this paper, the role of brittleness in white etching matter was determined by electron microscopy, which provided novel insights into cause-effect relationships and evolution mechanisms associated with white etchings.
Journal ArticleDOI
Non-saturated cyclic softening and uniaxial ratcheting of a high-strength steel: Experiments and viscoplastic constitutive modeling
Qiang Wang,Xuesong Liu +1 more
Journal ArticleDOI
An elasto-plastic-damage model for initiation and propagation of spalling in rolling bearings
TL;DR: In this article, an elasto-plastic-damage model was developed to investigate the spalling initiation and propagation behavior of bearings under rolling contact fatigue loading, and the intrinsic coupling relationship between the fatigue damage and the elastoneplastic behavior of materials was considered by specifying the damage-related Helmholtz free energy and dissipative potential function in the thermodynamic framework.
Journal ArticleDOI
A New Approach Towards Life Prediction of Case Hardened Bearing Steels Subjected to Rolling Contact Fatigue
TL;DR: In this paper, an experimental methodology was proposed to measure the location and magnitude of cyclically evolving elastoplastic von Mises stresses in terms of micro-hardness numbers.
Journal ArticleDOI
Effect of plasticity on the dynamic capacity of modern bearing steels
TL;DR: In this paper, it was shown that elastic-plastic stresses are significantly different from the elastic Hertz contact stresses, and that accounting for plastic deformation of the material necessitates significant correction in the material parameters used in the expressions for dynamic capacity calculations.
References
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Journal ArticleDOI
Microstructure-sensitive accumulation of plastic strain due to ratcheting in bearing steels subject to Rolling Contact Fatigue
TL;DR: In this paper, the accumulation of deformation/micro-plastic strain during RCF due to ratcheting behavior in the microstructure of bearing steels is studied.
Journal ArticleDOI
Rolling Contact Fatigue Life and Spall Propagation Characteristics of AISI M50, M50 NiL, and AISI 52100. Part 3. Metallurgical Examination (Preprint)
TL;DR: In this paper, the authors investigated the rolling contact fatigue initiation and spall propagation characteristics of three bearing materials, namely, AISI 52100, VIM-VAR M50, NiL steels.
Journal ArticleDOI
Microstructure–Property Relationships in M50-NiL and P675 Case-Hardened Bearing Steels
TL;DR: In this article, two different commercially available case-carburged steels (P675, M-50 NiL) and two through-hardened steels were characterized to obtain relationships among the volume fraction of subsurface carbides, indentation hardness, elastic modulus, and yield strength as a function of depth.
Journal ArticleDOI
Fracture and fatigue crack propagation properties of hardened 52100 steel
TL;DR: In this paper, the effect of hardening and tempering temperatures for conventional furnace-hardening techniques on toughness was investigated, the Klc being generally much less sensitive to these parameters than blunt notch toughness testing.
Journal ArticleDOI
Microstructure and residual stresses of a plasma-nitrided M2 tool steel
TL;DR: In this paper, the effect of plasma-nitriding parameters on the structure of the compound layer and diffusion zone of tool steel has been investigated using Metallographic inspection, X-ray diffraction and glow discharge optical spectroscopy analysis.
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