《模具专业英语》PPT课件

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1、UnitoneLesson2HeatTreatmentofToolSteels教学目标及要求1.掌握课文中有关热处理方面的专业词汇和专业术语；2.结合热处理的相关专业知识阅读课文，提高翻译能力。重点1.有关热处理的专业词汇和专业术语；2.翻译课文：热处理的原理;热处理的类型;热处理的步骤。难句分析及翻译的基础知识Part（Ⅰ）翻译的基础知识简介二、翻译的标准教学思路设计时间分配（共100min）：1.讲解课文中的专业词汇和术语；2.讲解课后生词、大声朗读；3.翻译课文，注意穿插相关专业知识；4.分析难点句型，讲解相关翻译基础知识；5.学生答疑。ContentsBackgroundKnowl

2、edgeNewWordsandPhrasedTextAnalysisQuestionsGlossaryofTermsLanguagePoints&TranslatingTechniquesReadingMaterialsSummaryReferencesThePrinciplesofHeatTreatmentHeattreatmentconsistsofHeating-UpandCooling-Downprocess.HeatingupthesteelwillchangethemicrostructuretoAustenite.Coolingdownthesteelatdifferentc

3、oolingrateswillchangethemicrostructurefromAustenitetodifferentstructurescorrespondingly.ChangeinMicrostructuresresultinchangeinmechanicalproperties.BackgroundKnowledgeByheattreatment,wecanchangethemechanicalpropertiesofmouldsandmachinecomponentstoourdesiredstate.Forexample,tohardenthemouldwillincr

4、easestrengthandwearresistanceresultinginlongermouldlife.Toannealahardsteelbarwillsoftenittoastategoodformachining.Tonormalizeasteelbarwilltoughenittoastategoodforimpact.NewWordsandExpressionsTerms：1.Heattreating热处理normalize正火spheroidiz球化处理anneal退火harden淬火temper回火caseharden表面淬火stressrelieving应力消除热处

5、理carburize渗碳quench-hardening淬火硬化NewWordsandExpressionsTerms：2.Iron-carbonequilibriumdiagram铁碳平衡相图ferrite铁素体austenite奥氏体pearlite珠光体carbide碳化物bainite贝氏体martensite马氏体liquid液态delta-ironα-铁alpha-ironβ-铁gamma-ironγ-铁Iron-carbonequilibriumdiagramTime-temperaturetransformation(TTT)diagramsAContinuouscooli

6、ngtransformation(CCT)curvecomparedtoTTTdiagram亚微观的；普通显微镜下看不出来的TemperingDuringtempering,martensiteundergoesatransformationprocessfromthatofcarbonatomssupersaturatedinirontoastructuretermedtemperedmartensitewhichconsistsofhighlydispersedsubmicroscopiccarbideparticlesinaferritematrix.Theextentofincre

7、aseinductilityhencetoughnessandthecorrespondingreductioninhardnessandstrengthisafunctionoftemperingtemperatureandtime.回火；调和AnnealingIfasteelbariscooledslowlyinafurnacefromatemperatureaboveitsuppercriticaltemperat