热轧带钢轧辊的破坏的一些研究外文翻译

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1、DamageinhotrollingworkrollsAbstractSamplesfromacoupleofworkrollsemployedinahotrollingsteelstripmillwereexaminedbyscanningelectronmicroscopyinordertostudytheirsurface,aswellasthewearmechanismsresponsiblefortheirdamage.Itwasfoundthataseriesofcracksdevelopwi

2、thintherollsatthebeginningoftheiroperationalcycle,thesecracksfollowtheprimarycarbidenetworkandareattributedtobecausedeitherbythermalfatigueorcontactstressesorbyacombinationofboth.Workrollsheatupasaresultofcontactwiththesteelstripandanoxidelayerformsonthem

3、.Itisobservedthatoxidationproceedsthroughthecracks,isolatinghealthymaterialwithbrittlelayers,acharacteristicwhichmightexplainthehighwearrateencounteredinsomestandsofthemill.♡1999ElsevierScienceS.A.Allrightsreserved.Keywords:Hotrolling;Steel;Wear;Oxidation

4、;Workrolls1.IntroductionSomeofthemostimportantsegmentsintheoperatingcostsofamodernhotrollingmillarerelatedtotheworkrolls,sincetheyareexpensiveandalargestockmustbekeptinhandtoassurethecontinuousoperationofthemill.Theworkrollshavetobechangedfrequently,accou

5、ntingfordowntime,andtheymustbegroundtotheirrequiredprofile(crown)beforebeingreplacedintothemill.Inmanycasesrollsarechangedbecausetheirsurfacehasdeteriorated,ratherthanbecauseofchangesinshapeorcrownduetothermalexpansionorwear.Previousresearchhaspointedoutt

6、hatthermalandmechanicalfatigue,aswellasabrasionduetohardironoxides,arethemostimportantfactorsaffectingtherateofsurfacedeteriorationinworkrollsofsecondgenerationtypemills.Newgeneration8millsrollingstripstothinnergaugesathigherspeedsseemstobenefitfromtheoxi

7、deformedattheirsurface,butthereisalsoevidencethatthisoxidationmightbedeleteriousinsomecases.Theaimofthisworkistopresenttheresultsfromaseriesofmicrostructuralobservations,carriedoutinpiecesobtainedfromspalledworkrolls,whichhelptoexplaintheconditionsandmech

8、anismsresponsiblefortheirsurfacedeterioration.1.RollsamplingItwouldbedesirabletoobtainsamplesfromworkrollswhichhavebeensubjectedtodifferentrollingconditions,butthiswouldimplycuttingandspoilinghealthyandusableworkpie