《机械工程专业英语》课程PPT教学课件（讲稿）Chapter 7 Materials Science and Technology

Chapter7Materials Science and Technology

Chapter 7 Materials Science and Technology

Contents7.1Materials forRail Traffic.7.2 Ceramic Material and Composite Material.7.3 BrakeDisc of MultipleUnits.7.4 Liquid Die Forging and Semi-Solid Forming

Contents • 7.1 Materials for Rail Traffic • 7.2 Ceramic Material and Composite Material • 7.3 Brake Disc of Multiple Units • 7.4 Liquid Die Forging and Semi-Solid Forming

7.1Materialsfor Rail Traffic·MaincontentsTerminology.TextTour

7.1 Materials for Rail Traffic • Main contents • Terminology • Text Tour

7.1 Materials for Rail Traffic.Maincontents.7.1.1Introductionof Material.7.1.2MetallicMaterial

• Main contents • 7.1.1 Introduction of Material • 7.1.2 Metallic Material 7.1 Materials for Rail Traffic

Main contentsCastironSteelforengineeringcomponentsFerrous materialSteelformachinepartsLSteelTool steelSteelfor special propertiesMetallic materialLightmetal (Al,Mg,Ti)Precious metal (Au, Ag)Heavy metal (Cu,Zn,Pb,Ni)Non-ferrousmaterialRaremetal (W,Mo,V,Nb.Co)Radioactivemetal (Ra,U,Th)Figure 7.1Classification of metallic material

Main contents

Forthe railway transportation,all kinds of parts suchas vehiclebody,wheels,axles,bogies,couplers,brakediscs,pantographs,etc.are inextricably linked to the materials.The materials commonly used in railwaytransportation include1.metallicmaterials2.ceramicmaterials·3.compositematerials

• For the railway transportation, all kinds of parts such as vehicle body, wheels, axles, bogies, couplers, brake discs, pantographs, etc. are inextricably linked to the materials. • The materials commonly used in railway transportation include • 1. metallic materials • 2. ceramic materials • 3.composite materials

WindowDoorFigure7.3Schematicdiagramofhigh-speedtrainstructureAtpresent,themetallic materials used forthe vehicle bodymainlyinclude stainless steel,highstrength weathering steellow-alloy low-carbonhigh strengthsteel,aluminumalloy,etc

At present, the metallic materials used for the vehicle body mainly include stainless steel, high strength weathering steel, low-alloy low-carbon high strength steel, aluminum alloy, etc

Table7.4Compositionofstainlesssteel(wt%)csPNsiNiSteelMnCrFe≤1≤2≤0.2SUS301L≤0.03≤0.03≤0.01516-186-8balance2≤ISUS304≤0.08≤0.03≤0.01518~206~10.5balanceTable7.5Mechanical propertiesof stainlesssteelElongation (%)TensileYield strengthModifiedThicknessstrengthSteelThicknessThickness(N/mm)treatment>0.4mm(N/mm)0.8mm345>690>401/2H>410>760>35SUS301L>253/1H>480>820H>685>930>20>205>520>40SUS304

LL+aAccording to the contentofalloying elementsandprocessingcharacteristics,WroughtaluminumBCastaluminumalloyalloyaluminum alloy can bedivided intoNon-heattreatablealuminum alloy1.wroughtaluminumalloy2.castingaluminumalloyHeat treatablealuminumalloyAlDContentofalloyingelement(wt%)Figure7.7Phasediagramofaluminumalloy

According to the content of alloying elements and processingcharacteristics, aluminum alloy can be divided into 1.wrought aluminum alloy 2.casting aluminum alloy

Table7.7Compositionofaluminumalloy(wt%）TiSiFeCrAlCuMnMgZnMaterial50527017550520>70>20175~245016T4>110>175>16T426061>85>175>16T6>8>245>265T62>245>265>10