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)<0.4mm>0.8mm<0.8mm1/1H>345>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%）TiSiFeCrAlCuMnMgZnMaterial5052<0.25<0.40<0.10<0.102.2~2.80.15~0.35<0.10Balance60610.4~0.8<0.700.15~0.40<0.150.8~1.2<0.25<0.150.04~0.35BalanceTable7.8Mechanicalproperties of aluminumalloyThicknessTensilestrengthYield strength (N/mm")MaterialQuality levelDuctility (%)(N/mm)(mm)II112.>7017550520>70>20175~2450<110<145>16T4>110>175>16T426061>85>175>16T6>8>245>265T62>245>265>10