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1、书名：模具设计与制造专业英 语 第2版 ISBN： 978-7-111-08537-9 作者：王晓江 出版社：机械工业出版社 本书配有电子课件模具设计与制造专业英语 第2版 ppt 课件Unit oneLesson2 Heat Treatment of Tool Steelsw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。 w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。u难句分析及翻译的基础知识Part（） 翻译的基础知识简介二、翻译的标准模具设计与制造专业英语 第2版 p
2、pt 课件w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。 模具设计与制造专业英语 第2版 ppt 课件ContentswBackground Knowledge wNew Words and Phrased wText Analysis wQuestions wGlossary of Terms wLanguage Points & Translating Techniques wReading Materials wSummary wRef
3、erences模具设计与制造专业英语 第2版 ppt 课件The Principles of Heat TreatmentwHeat treatment consists of Heating-Up and Cooling- Down process. wHeating up the steel will change the microstructure to Austenite. wCooling down the steel at different cooling rates will change the microstructure from Austenite to differ
4、ent structures correspondingly. wChange in Microstructures result in change in mechanical properties. Background Knowledge模具设计与制造专业英语 第2版 ppt 课件wBy heat treatment, we can change the mechanical properties of moulds and machine components to our desired state. wFor example, to harden the mould will in
5、crease strength and wear resistance resulting in longer mould life. wTo anneal a hard steel bar will soften it to a state good for machining. wTo normalize a steel bar will toughen it to a state good for impact. 模具设计与制造专业英语 第2版 ppt 课件New Words and ExpressionsuTerms：1. Heat treating 热处理normalize 正火sp
6、heroidiz 球化处理anneal 退火harden 淬火temper 回火case harden 表面淬火stress relieving 应力消除热处理carburize 渗碳quench-hardening 淬火硬化模具设计与制造专业英语 第2版 ppt 课件New Words and ExpressionsuTerms：2.Iron-carbon equilibrium diagram 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-iron
7、-铁alpha-iron -铁gamma-iron -铁模具设计与制造专业英语 第2版 ppt 课件Iron-carbon equilibrium diagram Time-temperature transformation (TTT) diagrams A Continuous cooling transformation (CCT) curve compared to TTT diagram亚微观的；普通显微镜 下看不出来的TemperingwDuring tempering, martensite undergoes a transformation process from that
8、 of carbon atoms supersaturated in iron to a structure termed tempered martensite which consists of highly dispersed submicroscopic carbide particles in a ferrite matrix. The extent of increase in ductility hence toughness and the corresponding reduction in hardness and strength is a function of tem
9、pering temperature and time. 回火；调和AnnealingwIf a steel bar is cooled slowly in a furnace from a temperature above its upper critical temperature to a temperature below the lower critical temperature, the structure of the steel will become ferrite and cementite again. This steel consists of a somewha
10、t coarser grain structure that is low in strength, high in ductile and soft. This process of heat treatment is called Annealing.退火，缓冷，韧化正火NormalizingwHowever, instead of cooling in furnace as described above, the steel is taken out from the furnace and cooled in still air, it is termed Normalizing.
11、A normalized steel bar possesses higher strength and toughness than its annealed counterpart. 对应物，配对物Quench-HardeningwIf a steel bar is rapidly cooled from its upper critical temperature by plunging it into a coolant such as water or oil (termed quenching), the effect is to transform the austenite i
12、nto a structure called martensite. Martensite is a very hard, but brittle constituent of steel.wFor steels having a carbon content less than 0.8%, a temperature at between 30 deg C to 50 deg C above the upper critical temperature (723 deg C) is used for quenching and the resulting structure comprise
13、s martensite and ferrite.The Heat Treatment ProcesswBasically, Heat Treatment just consists of heating up and cooling down process. These process can be further divided into four steps.One Step1 Construction of Time-Temperature-Transformation Diagram (TTT)and Continuous Cooling Transformations Diagr
14、am (CCT) TTT Diagrams - can be quite useful in determining the kinetics of transformation and the nature of the products. The curve shows the time required to complete the transformation at that temperature.One Step2wCCT Diagrams - Although the TTT diagrams can provide useful information about the s
15、tructures obtained through non-equilibrium thermal processing, they are not rigorously applicable to engineering applications because the assumptions of instantaneous cooling from elevated temperature is far more realistic, and a diagram showing the results of continuous cooling at various rates would be far more useful.Two StepswThe second step is a
