金属热处理外文及翻译

金属热处理外文及翻译

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时间:2018-05-12

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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

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