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机本0807班学生姓名曹然指导教师陈平、邓兴贵完成时间2012-05原文HeattreatmentofmetalThegenerallyaccepteddefinitionforheattreatingmetalsandmetalalloysis“heatingandcoolingasolidmetaloralloyinawaysoastoobtainspecificconditionsorproperties.”Heatingforthesolepu

2、rposeofhotworking(asinforgingoperations)isexcludedfromthisdefinition．Likewise，thetypesofheattreatmentthataresometimesusedforproductssuchasglassorplasticsarealsoexcludedfromcoveragebythisdefinition．TransformationCurvesThebasisforheattreatmentisthetime-temperature-transformationcurvesorTTTcurveswhere

3、，inasinglediagramallthethreeparametersareplotted．Becauseoftheshapeofthecurves，theyarealsosometimescalledC-curvesorS-curves．ToplotTTTcurves，theparticularsteelisheldatagiventemperatureandthestructureisexaminedatpredeterminedintervalstorecordtheamountoftransformationtakenplace．Itisknownthattheeutectoi

4、dsteel(T80)underequilibriumconditionscontains，allausteniteabove723℃，whereasbelow，itisthepearlite．Toformpearlite，thecarbonatomsshoulddiffusetoformcementite．Thediffusionbeingarateprocess，wouldrequiresufficienttimeforcompletetransformationofaustenitetopearlite．Fromdifferentsamples，itispossibletonoteth

5、eamountofthetransformationtakingplaceatanytemperature．Thesepointsarethenplottedonagraphwithtimeandtemperatureastheaxes．Throughthesepoints，transformationcurvescanbeplottedasshowninFig.1foreutectoidsteel．Thecurveatextremeleftrepresentsthetimerequiredforthetransformationofaustenitetopearlitetostartata

6、nygiventemperature．Similarly，thecurveatextremerightrepresentsthetimerequiredforcompletingthetransformation．Betweenthetwocurvesarethepointsrepresentingpartialtransformation.ThehorizontallinesMsandMfrepresentthestartandfinishofmartensitictransformation.ClassificationofHeatTreatingProcessesInsomeinsta

7、nces，heattreatmentproceduresareclear-cutintermsoftechniqueandapplication．whereasinotherinstances，descriptionsorsimpleexplanationsareinsufficientbecausethesametechniquefrequentlymaybeusedtoobtaindifferentobj