The correlation between friction coefficient and areal topography parameters for AISI 304 steel sliding against AISI 521
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ISSN 2223-7690 CN 10-1237/TH
RESEARCH ARTICLE
The correlation between friction coefficient and areal topography parameters for AISI 304 steel sliding against AISI 52100 steel Deepak K. PRAJAPATI*, Mayank TIWARI Department of Mechanical Engineering, Indian Institute of Technology, Patna 801103, India Received: 13 February 2019 / Revised: 21 May 2019 / Accepted: 14 August 2019
© The author(s) 2019. Abstract: Dry wear experiments provide an insight detail on how severely contacting surfaces change under unlubricated sliding condition. The theory of dry sliding wear is used for understanding mixed-lubrication regime in which asperity interactions play a significant role in controlling of the friction coefficient (f). The purpose of this work is to study the tribological behavior of AISI 304 steel in contact with AISI 52100 steel during wear. Both materials are used in rolling element bearings commanly. Experiments are carried out using a pin-on-disc tribometer under dry friction condition. The areal (three dimensional, 3D) topography parameters are measured using a 3D white light interferometer (WLI) with a 10× objective. After wear tests, wear mechanisms are analyzed utilizing scanning electron microscope (SEM). Factorial design with custom response surface design (C-RSD) is used to study the mutual effect of load and speed on response variables such as f and topography parameters. It is observed that the root mean square roughness (Sq) decreases with an increase in sliding time. Within the range of sliding time, Sq decreases with an increase in the normal load. Within the range of sliding speed and normal load, it is found that Sq, mean summit curvature (Ssc), and root mean square slope (Sdq) are positively correlated with f. Whereas, negative correlation is found between f and correlation length (Sal), mean summit radius (R), and core roughness depth (Sk). Keywords: friction coefficient ( f ); areal topography parameters; factorial design; non-contact optical profiler; scanning electron microscope (SEM)
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Introduction
Severe asperity-to-asperity contacts cause serious failure in high power density machines (power throughput /weight) such as wind turbines, electric drive trains, high power transmission machines, off-highway vehicles (OHV’s), and paper machines [1−3]. Nonconformal concentrated tribological contacts are usually subjected to rolling/sliding or pure sliding motion causes asperity removal from the mating surfaces and the process is known as ‘wear’ resulting in significant loss of material. It is generally expected to run tribological components in elastohydrodynamic lubrication regime, but what is achieved is boundary and mixed-lubrication regimes which are the primary
cause for the breakdown of high power density machines [1−3]. Dynamic friction arises due to shearing of asperities and varies according to the shear strength of the contacting materials, the normal load, hardness of material, and composite surface roughness. Improvement in sliding friction depends on various factors but most importa
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