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1、DamageinhotrollingworkrollsRafaelColasa,M,JorgeRamirezb,IgnacioSandovalb,JulioC.Moralesb,LuisA.LeducbuFaculladdeIn^enieriaMecdnicayEkxtricu.UnirersidadAukinomadeNueroLedn.A.P.149-F.66451Cd.Cnirersilaria.NLMexiohDirisidnAlvidsPianos.Hylsa.S.A.deC.V.9A.P.W6.64O
2、IX)Monterrey.NLMexicoAccepted11Januan*1999AbstractSamplesfromacoupleofworkrollsemployedinahotrollingsteelstripmillwereexaminedbyscanningelectronmicroscopyinordertostudytheirsurface,aswellasthewearmechanismsresponsiblefortheirdamage.Itwasfoundthataseriesofcrac
3、ksdevelopwithintherollsatthebeginningoftheiroperationalcycle,thesecracksfollowtheprimarycarbidenetworkandareattributedtobecausedeitherbythermalfatigueorcontactstressesorbyacombinationofboth.Workrollsheatupasaresultofcontactwiththesteelstripandanoxidelayerform
4、sonthem.Itisobservedthatoxidationproceedsthroughthecracks,isolatinghealthymaterialwithbrittlelayers,acharacteristicwhichmightexplainthehighwearrateencounteredinsomestandsofthemill.▽1999ElsevierScienceS.A.Allrightsreserved.Keywords：Hotrolling;Steel;Wear;Oxidat
5、ion;Workrolls1・IntroductionSomeofthemostimportantsegmentsintheoperatingcostsofamodernhotrollingmillarerelatedtotheworkrolls,sincetheyareexpensiveandalargestockmustbekeptinhandtoassurethecontinuousoperationofthemilkTheworkrollshavetobechangedfrequently,account
6、ingfordowntime,andtheymustbegroundtotheirrequiredprofile(crown)beforebeingreplacedintothemill.Inmanycasesrollsarechangedbecausetheirsurfacehasdeteriorated,ratherthanbecauseofchangesinshapeorcrownduetothermalexpansionorwear.Previousresearchhaspointedoutthatthe
7、rmalandmechanicalfatigue,aswellasDamageinhotrollingworkrollsRafaelColasa,M,JorgeRamirezb,IgnacioSandovalb,JulioC.Moralesb,LuisA.LeducbuFaculladdeIn^enieriaMecdnicayEkxtricu.UnirersidadAukinomadeNueroLedn.A.P.149-F.66451Cd.Cnirersilaria.NLMexiohDirisidnAlvidsP
8、ianos.Hylsa.S.A.deC.V.9A.P.W6.64OIX)Monterrey.NLMexicoAccepted11Januan*1999AbstractSamplesfromacoupleofworkrollsemployedinahotrollingsteelstripmillwereexaminedbyscanningelectronmicroscopy
