金属热处理外文及翻译

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1、湖南工院毕业设计(论文)外文翻译外文题目Heattreatmentofmetal译文题目金属热处理系部机械工程系专业班级机械设计制造及其自动化学生姓名指导教师完成时间原文HeattreatmentofmetalThegenerallyaccepteddefinitionforheattreatingmetalsandmetalalloysis“heatingandcoolingasolidmetaloralloyinawaysoastoobtainspecificconditionsorproperties.”Heatingforthesolep

2、urposeofhotworking(asinforgingoperations)isexcludedfromthisdefinition．Likewise，thetypesofheattreatmentthataresometimesusedforproductssuchasglassorplasticsarealsoexcludedfromcoveragebythisdefinition．TransformationCurvesThebasisforheattreatmentisthetime-temperature-transformati

3、oncurvesorTTTcurveswhere，inasinglediagramallthethreeparametersareplotted．Becauseoftheshapeofthecurves，theyarealsosometimescalledC-curvesorS-curves．ToplotTTTcurves，theparticularsteelisheldatagiventemperatureandthestructureisexaminedatpredeterminedintervalstorecordtheamountoftr

4、ansformationtakenplace．Itisknownthattheeutectoidsteel(T80)underequilibriumconditionscontains，allausteniteabove723℃，whereasbelow，itisthepearlite．Toformpearlite，thecarbonatomsshoulddiffusetoformcementite．Thediffusionbeingarateprocess，wouldrequiresufficienttimeforcompletetransfo

5、rmationofaustenitetopearlite．Fromdifferentsamples，itispossibletonotetheamountofthetransformationtakingplaceatanytemperature．Thesepointsarethenplottedonagraphwithtimeandtemperatureastheaxes．Throughthesepoints，transformationcurvescanbeplottedasshowninFig.1foreutectoidsteel．Thec

6、urveatextremeleftrepresentsthetimerequiredforthetransformationofaustenitetopearlitetostartatanygiventemperature．Similarly，thecurveatextremerightrepresentsthetimerequiredforcompletingthetransformation．Betweenthetwocurvesarethepointsrepresentingpartialtransformation.Thehorizont

7、allinesMsandMfrepresentthestartandfinishofmartensitictransformation.ClassificationofHeatTreatingProcessesInsomeinstances，heattreatmentproceduresareclear-cutintermsoftechniqueandapplication．whereasinotherinstances，descriptionsorsimpleexplanationsareinsufficientbecausethesamete

8、chniquefrequentlymaybeusedtoobtaindifferentobjectives．Forexample,str