Modeling the Influence of Microstructure in Rolling Contact Fatigue

Alley, Erick S.; Sawamiphakdi, Krich; Anderson, Patrick I.; Neu, Richard W.

doi:10.1520/stp49126s

Cited by 3 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The interface of the rotating master (bearing steel) and slave disc (sintered steel), which are fixed at their centres, is subjected to distributed Hertzian pressure due to a normal contact force, that affects stress and contact pressure. Then, the problem can be reduced from a rolling-sliding contact to a quasi-static sliding contact [21][22][23].…”

Section: Equivalent Hertzian Contact Modellingmentioning

confidence: 99%

Numeric simulation of steel twin disc system under rolling-sliding contact

Gebretsadkan Brhane,

Tesfaye Mekonone

2023

tribomat

View full text Add to dashboard Cite

Various mechanical parts come into high-load rolling and sliding contact at the contact surface. Even with technological advancements, mechanical failures still occur. Rolling-sliding mechanical contact issues are the primary cause of over 90 % of surface and subsurface metallic failures and they are only becoming worse. Using discretised continuum 2D finite element methods (FEM), this research investigates the parametric contact effect of a steel twin disc system subjected to rolling-sliding contact at varied surface friction and comprehensive load condition. The equivalent von Mises stress distribution, contact pressure distribution and shift position of maximum subsurface stress on the contour region are all influenced by changes in compressive load and coefficient of friction, according to a numerical surface-to-surface contact simulation performed with Abaqus at mean Hertzian pressure. The maximal equivalent stress, for a given load, reaches a peak in the subsurface and moves farther away from the surface when the coefficient of friction decreases and comes close to the contact surface when the coefficient of friction increases. Consistency is shown by the analytical and numerical results.

show abstract

Section: Equivalent Hertzian Contact Modellingmentioning

confidence: 99%

Numeric simulation of steel twin disc system under rolling-sliding contact

Gebretsadkan Brhane,

Tesfaye Mekonone

2023

tribomat

View full text Add to dashboard Cite

show abstract

Chapter 8 | Heat Treatment Process Technologies—Hardening and Tempering Treatments

Beswick¹

2022

Rolling Bearing Steel: Design, Technology, Testing and Measurements

View full text Add to dashboard Cite

The choice of appropriate hardening heat treatments profoundly influences the functional properties of rolling bearings. Through hardening heat treatments of 52100 type steels include martensitic or bainitic treatments and such heat treatments are applied when the static capacity needs to be maximized in point contact rolling bearings. Surface hardening is used when toughness is a primary consideration with case-carburizing, surface induction hardening and laser heating being the most familiar surface hardening technologies. The formation of near-surface compressive stresses is a beneficial factor in the selection of case carburization heat treatments. Case carburization can be combined with nitrogen enrichment to enhance the raceway tolerance to contaminated lubrication. Microstructures developed by appropriate austenitization, quenching and lower bainite transformation are essential considerations with respect to functional properties. Hardness is an overriding property consideration but the amount of austenite is an issue with respect to bearing component dimensional stability. Increased volume percentages of retained austenite goes hand-in-hand with high carbon plate martensitic surfaces zones of case carburized bearing components. Tempering after martensitic quenching is applied to transform austenite retained in the microstructure and in certain cases subzero treatments are employed. Surface induction heating and quenching is an efficient methodology for hardening of rolling bearing raceways. Hub unit bearing raceways are selectively austenitized and quenched in a few seconds whereas large-size rolling bearing rings are progressively heated and quenched using lengthier cycle times. Secondary hardening is applied to higher alloyed bearing steels such as M50 when high temperature hardness retention is required. Nitriding of the surface in combination with through or case carburization is a methodology for improving performance in hybrid bearings, i.e., steel rings and silicon nitride rolling elements. Distortion of rolling bearing rings is the curse of the hardening operation and, if not controlled, can have a negative influence on grinding costs.

show abstract

Chapter 13 | Rolling Contact Microstructural Alterations and Effect on Residual Stress and Fatigue Limit, “Butterflies,” Material Response Analysis, and Modeling of Rolling Contact Fatigue Life

Beswick¹

2022

Rolling Bearing Steel: Design, Technology, Testing and Measurements

View full text Add to dashboard Cite

Alterations of the subsurface microstructure of rolling bearing steels, due to cyclic rolling contact loads, have been known for a long time. Light optical, white etching “wings” observed with nonmetallic inclusions in bearing steels are a particular fascination to bearing metallurgists. Rolling contact microstructural transformations have been the subject of numerous studies and publications. Knowledge as to the nature of the complex transformations has improved with the introduction of advanced experimental methods. Retained austenite is often present in the contact surfaces of through and surface hardened standard bearing steels and this unstable microstructure constituent is generally the first to transform under rolling contact loads. Three stages have been observed in the microplastic microstructure transformations, namely: 1) shakedown, 2) steady state, and 3) microstructure instability. The transformations may be quantified by the use of x-ray diffraction methods as described in the ASTM standard practice E975-13. In addition the change in residual stress due to rolling contact microstructural transformations can be quantified by the application X-ray diffraction methodologies. The presence of butterflies tends to indicate a significant presence of debonded nonmetallic inclusions and combined structural and rolling contact loading. Description of the microstructural transformation is typically abbreviated, for example “DER,” meaning “dark etching region” and “WEC” meaning “white etching crack,” etc. Higher alloyed, secondary hardening, steels used in aerospace rolling bearings also exhibit subsurface rolling contact microstructure transformations. In such steels, different light-etching regions (LERs) have been reported, adding to the already complex but fascinating topic. Characterization of the rolling contact microstructure transformation is a useful tool in rolling bearing diagnostic investigations. Terms such as remaining life of a rolling bearing are applied to describe how much of the contact fatigue life of a steel exists after exposure to rolling contact loading. Characterization of subsurface microstructures unambiguously defines the rolling contact conditions.

show abstract

Modeling the Influence of Microstructure in Rolling Contact Fatigue

Cited by 3 publications

References 0 publications

Numeric simulation of steel twin disc system under rolling-sliding contact

Numeric simulation of steel twin disc system under rolling-sliding contact

Chapter 8 | Heat Treatment Process Technologies—Hardening and Tempering Treatments

Chapter 13 | Rolling Contact Microstructural Alterations and Effect on Residual Stress and Fatigue Limit, “Butterflies,” Material Response Analysis, and Modeling of Rolling Contact Fatigue Life

Contact Info

Product

Resources

About