{"title":"Investigation of white etching area at non-carbides origin in M50 bearing steel under rolling contact fatigue","authors":"","doi":"10.1016/j.triboint.2024.110222","DOIUrl":null,"url":null,"abstract":"<div><p>White etching areas (WEAs) were originated in regions free of carbides or non-metallic inclusions under rolling contact fatigue (RCF) in M50 bearing steel. Two types of WEAs with largely sheared and compact morphologies were observed. They were investigated using Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). The results show that WEAs involve martensite-to-austenite phase transformation and amorphization, in contrast to the butterfly-winged WEAs consisting of only ferrite nanocrystallines. It is suggested that the nanocrystallines are the result of recrystallization. The high micro shear strain of 0.9–1.1 drives phase transformation. The solid-state amorphization occurs due to accumulation of high dislocation density. The dislocation density in the compact WEA is much higher than that in the sheared WEA.</p></div>","PeriodicalId":23238,"journal":{"name":"Tribology International","volume":null,"pages":null},"PeriodicalIF":6.1000,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Tribology International","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0301679X24009745","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
White etching areas (WEAs) were originated in regions free of carbides or non-metallic inclusions under rolling contact fatigue (RCF) in M50 bearing steel. Two types of WEAs with largely sheared and compact morphologies were observed. They were investigated using Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). The results show that WEAs involve martensite-to-austenite phase transformation and amorphization, in contrast to the butterfly-winged WEAs consisting of only ferrite nanocrystallines. It is suggested that the nanocrystallines are the result of recrystallization. The high micro shear strain of 0.9–1.1 drives phase transformation. The solid-state amorphization occurs due to accumulation of high dislocation density. The dislocation density in the compact WEA is much higher than that in the sheared WEA.
期刊介绍：
Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International.
Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.
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