外文翻译damage in hot rolling work rolls

《外文翻译damage in hot rolling work rolls》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、内蒙古科技大学本科生毕业设计外文翻译DamageinhotrollingworkrollsAbstractSamplesfromacoupleofworkrollsemployedinahotrollingsteelstripmillwereexaminedbyscanningelectronmicroscopyinordertostudytheirsurface,aswellasthewearmechanismsresponsiblefortheirdamage.Itwasfoundthataseriesof

2、cracksdevelopwithintherollsatthebeginningoftheiroperationalcycle,thesecracksfollowtheprimarycarbidenetworkandareattributedtobecausedeitherbythermalfatigueorcontactstressesorbyacombinationofboth.Workrollsheatupasaresultofcontactwiththesteelstripandanoxidelaye

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

4、Oxidation;Workrolls1.IntroductionSomeofthemostimportantsegmentsintheoperatingcostsofamodernhotrollingmillarerelatedtotheworkrolls,sincetheyareexpensiveandalargestockmustbekeptinhandtoassurethecontinuousoperationofthemill.Theworkrollshavetobechangedfrequently

5、,accountingfordowntime,andtheymustbegroundtotheirrequiredprofile(crown)beforebeingreplacedintothemill.Inmanycasesrollsarechangedbecausetheirsurfacehasdeteriorated,ratherthanbecauseofchangesinshapeorcrownduetothermalexpansionorwear.Previousresearchhaspointedo

6、utthatthermalandmechanicalfatigue,aswellasabrasionduetohardironoxides,arethemostimportantfactorsaffectingtherateofsurfacedeteriorationinworkrollsofsecondgenerationtypemills.Newgeneration7内蒙古科技大学本科生毕业设计外文翻译millsrollingstripstothinnergaugesathigherspeedsseemst

7、obenefitfromtheoxideformedattheirsurface,butthereisalsoevidencethatthisoxidationmightbedeleteriousinsomecases.Theaimofthisworkistopresenttheresultsfromaseriesofmicrostructuralobservations,carriedoutinpiecesobtainedfromspalledworkrolls,whichhelptoexplaintheco

8、nditionsandmechanismsresponsiblefortheirsurfacedeterioration.1.RollsamplingItwouldbedesirabletoobtainsamplesfromworkrollswhichhavebeensubjectedtodifferentrollingconditions,butthiswouldimplycutti