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Effect of laser textured surface with different patterns on tribological characteristics of bearing material aisi 52100

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Journal of Central South University 2020年第8期27卷 2210-2219页

作者： PAUL JOSHUA S DINESH BABU P School of Mechanical Engineering SASTRA Deemed UniversityThanjavur 613401TamilnaduIndia

Chrome steels are used in bearings since they possess high strength and wear ***,when those parts are in service,failure happens due to sliding friction before the *** improve the durability of the American Iron and Steel Institute(aisi)52100 chromium steel,in this work,the effect of laser surface texturing(LST)was *** the different patterns of circle and ellipse comparing with the untextured samples,the wear behavior was investigated using the pin-on-disc *** lubricant used for wear analysis is semisolid lithium grease National Lubricating Grease Institute lubricant(SKF NLGI-3).Sliding wear analysis was conducted at different loads of 10 N,30 N and 50 N for the sliding speed of 750 r/min and 1400 r/*** wear morphology was analyzed using a scanning electron microscope(SEM).The roughness of the samples was found using a white light *** effect of different patterns like circle and ellipse,alter the friction and wear properties of chromium alloy was observed compared with the untextured *** shows considerable reduction in friction and wear for ellipsoidal pattern compared with the circular pattern because of wear debris and lubricant getting trapped.

关键词： laser surface micro texturing aisi52100 3D surface roughness wear scanning electron microscopy

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Surface nanocrystallization in aisi 52100 steel induced by surface mechanical grinding treatment(SMGT)

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Baosteel Technical Research 2010年第S1期4卷 94-页

作者： FANG Tiehui,TAO Nairong and LU Ke Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

Surface nanocrystallization(SNC) has proved to be an effective approach to improve the overall properties of bulk metallic ***,a new surface nanocrystallization technique,i.e.,surface mechanical grinding treatment(SMGT),was *** this work,a gradient nano-micro structure was achieved in the surface layer of the aisi 52100 steel by using *** obtained a minimum grain size of about 7nm in the top surface *** total thickness of the deformed layer is over 200 *** the surface roughness is rather low. Ferrite grains were deformed to different extents varying with depth from the top *** grain sizes were formed from top surface to deep matrix which offered a great opportunity to study the refinement process of the ferrite *** is found that dislocation activities play a dominant role in the *** the initiate stage, dislocations accumulated and interacted to form dense dislocation walls and *** strain and strain rate induced more dislocation walls in cells,forming finer *** procedure continued until nanograins formed at the top most surface. The existence of cementite particles in ferrite matrix greatly facilitates the ferrite refinement *** between ferrites and cementites offered many dislocation sources which accelerate the propagation of dislocations. Dislocation walls were blocked by cementites which certainly lead to finer dislocation *** existence of cementites makes it easier to generate fresh dislocation walls in sub-micron grains.A strain gradient was formed from a cementite particle to surrounding ferrite *** strain gradient gives rise to more geometric necessary dislocations. As ferrite grain size decreased less than that of cementite particles,fragmentation occurred in *** second phase was usually considered as *** this work,evidences of deformation(traces of dislocation activities) in cementites were *** the stres

关键词： surface nanocrystallization aisi52100 gradient nanostructures grain

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