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1、Engineering MaterialsLecturers: Sun Lan School of Manufacturing Science and Engineering, Sichuan University Sun Lan（孙兰） Dept. of Materials Forming and Controlling School of Manufacturing Science and Engineering Sichuan University Tel: 13881781856 E-mail: 3Course Description Engineering Materials ：th
2、e materials science, general laws on the material composition, structure, performance and applications Course requires ：1. the relationship on composition, structure and performance of the commonly used engineering materials 2. The types grades, properties and uses of engineering materials. 3. the c
3、orrect choice of heat treatment method 4. The failure of the different material components4Course Features uTechnical coursesuStronger NarrativeuConcept of the principleuMore Symbol uLess Calculation uStronger practicalityPreviewReview Attendance5References1、工程材料学（第1版或第2版-修订版）王晓敏 哈工大出版社（2002年8月）2、En
4、gineering Materials ( Vol. One, 2nd Edition )R. L. Timings 世界图书出版公司 （2000年6月）3、机械工程材料 （第1版）沈 莲 机械工业出版社 （1999年5月）4、Selection and Use of Engineering Materials ( 3rd Edition )J. A. Charles, F. A. A. Crane, J. A. G. Funess 世界图书出版公司（2000年6月） Chapter 1 Introduction to Materials and their PropertiesChapter
5、 1 Introduction to Materials and Their Properties the selection of materials for any given application. The basic properties of materials. The grouping of materials into their maincategories.1.1 Introduction to use and to develop materials to satisfy the human requirementsmaterials for housing, heat
6、ing, furniture, clothes, transportation, entertainment, medical care, defense, etc. waste materials must be reclaimed and recycled role of materials engineers ( also materials students )9 Mainstay industry：Material is the basis of any forms of energy and information Engineering Materials：structural
7、materials，the mechanical properties，engineering structures and mechanical parts as the main requirements.1.1 Introduction1.2 Selection of Materials Commercial factors such as:(a) cost (b) availability (c) ease of manufacture Engineering properties of materials such as: electrical conductivity streng
8、th, toughness corrosion resistance, wear resistance ease of forming by extrusion, forging and casting machinability heat (thermal ) resistance, etc. 1.2 Selection of Materials Examples : (a) electric cable connector electrical conductivity, ease of forming by extrusion, forging and casting, ease of
9、machinability, adequate strength and corrosion resistance. Silver? (Expensive) Cu, Al(b) connecting rod Strength, toughness, ease of machinability(c) tailstock casting (底座铸件)-cast iron adequate strength， ease of melting and casting， good machinability121.3 Material Properties（1）使用性能Application prope
10、rties ： mechanical properties，physical properties and chemical properties（Priority）（2）工艺性能Processing properties ：铸造(Casting)、锻压(Forging and pressing)、焊接(Welding)、热处理(Heat treating)和切削(Cutting)性能等。13 Mechanical properties:（ Strength, stiffness, hardness, elasticity, plasticity, toughness and wear res
11、istance） Deformation: changes of the shape and size because of the external forces.elastic deformation。plastic deformation。1.3 Material Properties14StrengthResistance of plastic deformation and fractureYield strength: stress happened plastic deformationTensile strength and bending strength: stress h
12、appened fractureApplication：machine components，1.3 Material Properties15 PlasticCharacterization of plastic deformation under external force Fractured residual deformation： Elongation percentage： Contraction of area：1.3 Material Properties16 韧性ToughnessAbsorb energy before fracture, and the ability
13、to plastic deformation（Strength + Plastic） 刚度(stiffness )Resistance of elastic deformationThe elastic modulus E: stress/strain, a constant in the range of elastic deformation; the key performance indicators for the characterization of material stiffness.1.3 Material Properties17 Hardness: the materi
14、als resistance to localized plastic deformation. （HRC、HB、HV）. Wear resistance: the material to resist wear under certain operating conditions.The relative wear resistance is the ratio of the amount of wear of two materials in the same working conditions.1.3 Material Properties18材料 的力 学性 能指 标应 用刚度：刚度
15、设计中，考虑构件 在受力时发生的弹性变形量。 弹性模量。如精密机床主轴等 零构件弹性指标：弹性极限和弹性 模量是设计弹性零件考虑的 性能指标。如汽车板簧和各 类弹簧等屈服强度和塑性：一般零件 的抗断裂设计。硬度：在耐磨零件中必须考虑的 性能指标。如滚珠轴承等.19TITANIC20Impacting tests results of steel on Titanic （Left）and steel used on board recently（Right）21 Physical property density、Melting point、Heat conductivity、Electrica
16、l conductivity、Thermal expansion、Magnetism； Chemical propertyresistance to chemical erosion of various media.(Oxidation resistance and corrosion resistance)1.3 Material Properties22(2) Processing properties casting、forging、welding、heat treating and cutting等。 Casting（ Fluidity, shrinkage, segregation ） 铸
