surface topography and fatigue life of rolling contact

A novel surface treatment method of combining ultrasonic surface rolling (USR) and shot peening (SP) in different sequences was proposed The microstructures and rolling contact fatigue (RCF) behaviors of 17Cr2Ni2MoVNb steel were investigated after USR treatment SP treatment and combined (USR + SP + The contact surface roughness in samples tested at 2100 N increased during the rolling contact and severe adhesion wear was present at the entire surface In case of 500 and 1000 N tests the surface roughness remained low with mild adhesion wear occurring It is concluded that adhesion force levels are higher under high load rolling contact

Effect of Surface Hardening Technique and Case

Surface hardening techniques are widely used to improve the rolling contact fatigue resistance of materials This study investigated the rolling contact fatigue (RCF) resistance of hardened ground steel rods made from three different aircraft-quality alloy steels (AISI 8620 9310 and 4140) and hardened using different techniques (atmosphere carburizing vacuum carburizing and induction

An experimental investigation was carried out to study and compare the response to cyclic loading of the high-performance railway wheel steels ER8 EN13262 and SUPERLOS Rolling contact tests were performed with the same contact pressure rolling speed and sliding/rolling ratio varying the lubrication regime to simulate different climatic conditions

2020-1-27Zhou Surface topography and fatigue life of rolling contact bearing Tribol From white etching areas formed around inclusions to crack nucleation in bearing steels under rolling contact fatigue in Bearing Steels: Into the 21st Century (ASTM International

Surface roughness – also known as surface profile R a – is a measurement of surface finish – it is topography at a scale that might be considered texture on the surface Level 5 The highest quality finish is the most effective method to pro-vide a uniform surface and minimize the possibility of joint pho-tographing and of fasteners

2020-4-1Rolling contact micropitting fatigue failure of a rough surface could be reduced by running-in process • The ratio of root mean square roughness R q to the mean asperity radius r s R q /r s is proposed as a novel statistical parameter of rough surfaces which is negatively correlated with micropitting fatigue lives For the same local contact region of a rough surface pre and post running

Research on Mechanical Properties of 210Cr12 Shaft

The rolling process is one of the most effective ways for strengthening a part's surface As the press force exerted on specimen in rolling process material in the surface layer will deform plastically if the press force is sufficient That might result in grain refinement dislocation configuration change or phase change in specimen surface layer material

Surface Topography: Metrology and 2019 Paper # 1275 Experimental investigation on evolution of surface damage and topography parameters during rolling contact fatigue tests Deepak K Prajapati Maynank Tiwari Fatigue Fracture of Engineering Materials and Structures 2019 – Wiley

2018-1-11on the contact fatigue life The results of infrared thermal image analysis showed that the surface temperature of the contact point could reflect the degree of contact fatigue damage of the coating at a certain level and could be used to predict the contact fatigue life of the coating The statistical properties of the surface temperature of the

Rolling contact fatigue (RCF) is one of the major problems observed in gear mechanisms which leads to high friction ultimately resulting in high energy consumption This paper demonstrates the evolution of surface topography during running-in and subsequent RCF tests under boundary or mixed-elastohydrodynamic lubrication regimes

2019-3-27deep compressive residual stresses that often increase the fatigue life [3] In literature the rolling contact fatigue (RCF) life of bearing steel components is heavily influenced by the surface topography [4 5] as well as metallurgical and mechanical state of the subsurface layers [6] The surface roughness in elastohydrodynamic lubrication

However the effects of distinct surface integrity by hard turning versus grinding on rolling contact life are poorly understood Four representative surface types were prepared: as‐turned as‐ground turned and polished and ground and polished Surface integrity was characterized by surface topography microstructure and micro/nanohardness

Surface roughness – also known as surface profile R a – is a measurement of surface finish – it is topography at a scale that might be considered texture on the surface Level 5 The highest quality finish is the most effective method to pro-vide a uniform surface and minimize the possibility of joint pho-tographing and of fasteners

2018-11-10The paper proposes a rolling/sliding contact fatigue model for machine components in mixed lubrication undergoing cyclic loading The model consists of two distinct components The first is a full-scale mixed lubrication analysis of interacting rough surfaces during which surface pressure distribution is calculated

The ability of precision hard turning to increase rolling

2019-3-27deep compressive residual stresses that often increase the fatigue life [3] In literature the rolling contact fatigue (RCF) life of bearing steel components is heavily influenced by the surface topography [4 5] as well as metallurgical and mechanical state of the subsurface layers [6] The surface roughness in elastohydrodynamic lubrication

2019-11-8Comparison of rolling contact fatigue life between elastohydrodynamic lubricated point contacts pre and post running-in treatment Effect of Surface Topography on Contact Fatigue in Mixed Lubrication Tribology Transactions Vol 46 No 4 Surface fatigue life of carburized and hardened M50NiL and AISI 9310spur gears and rolling-contact

2020-4-29Pu et al [12] evaluated the contact fatigue performance under combined rolling and sliding motions by con-sidering the sinusoidal roughness The results imply that sliding could reduce the contact fatigue life dramatically and rough surface contacts would lead to accelerated pitting failures Yan et

The effect of a gradient nanostructured (GNS) surface layer obtained by ultrasonic surface rolling process (USRP) on the fatigue behavior of Ti-6Al-4 V alloy has been studied in this paper Microstructure surface topography surface roughness and residual stress measurements were performed to characterize the surface under different conditions

2019-11-8Comparison of rolling contact fatigue life between elastohydrodynamic lubricated point contacts pre and post running-in treatment Effect of Surface Topography on Contact Fatigue in Mixed Lubrication Tribology Transactions Vol 46 No 4 Surface fatigue life of carburized and hardened M50NiL and AISI 9310spur gears and rolling-contact

2007-8-10Keywords: Fatigue Surface roughness Stress concentration 1 Introduction Surface roughness and surface integrity resulting from manufacturing processes are both important consider-ations in fatigue design In fact the effects of surfaces on the fatigue life of metals have been recognized for many years [1 2] Fatigue damage on the surface of a

The test results show that the pre-denting method using hard powder is more efficient to reproduce surface morphology and damage mechanisms observed under practical operating conditions Keywords: rolling contact fatigue life contaminated lubrication surface

2019-2-18Si3N4 rolling elements produced by HIP have also exhibited a rolling contact fatigue (RCF) life that is several times longer than that of steel and fail in non-catastrophic fatigue spalling or delamination modes [4] The RCF in concentrated contacts such as rolling bearings is either near-surface-initiated or subsurface-initiated [5]

However the effects of distinct surface integrity by hard turning versus grinding on rolling contact life are poorly understood Four representative surface types were prepared: as‐turned as‐ground turned and polished and ground and polished Surface integrity was characterized by surface topography microstructure and micro/nanohardness

1 Full surface tank fire : Jaipur terminal fire ONGC plant fire in Mumbai Fatigue corrosion fatigue Corrosion Metallurgical degradation in monuments What's the road to reliability in ageing plants ? How RBI becomes unreliable approach ? Integrity operating window for life enhancement

Rolling Contact Fatigue Fatigue Life Dispersion Weibull Distribution Dynamic Capacity and Life of a Rolling Contact Fatigue Life of a Rolling Bearing Surface Topography Effects Grease Lubrication Lubrication Regimes Closure FRICTION IN ROLLING ELEMENT-RACEWAY CONTACTS List of Symbols General

2019-3-27deep compressive residual stresses that often increase the fatigue life [3] In literature the rolling contact fatigue (RCF) life of bearing steel components is heavily influenced by the surface topography [4 5] as well as metallurgical and mechanical state of the subsurface layers [6] The surface roughness in elastohydrodynamic lubrication

2004-6-23ship between surface roughness parameters and rolling contact fatigue life are therefore of interests and concerns for both industry and academia Lakshminarayanan and Chao studied the lubricated rolling contact of steelysilicon nitride using a ball-on-rod rolling-contact-fatigue