精品课程铁碳相图.ppt

精品课程铁碳相图.ppt

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CollegeofMaterialsScienceandEngineering1FundamentalsofMaterialsScienceFundamentalsofMaterialsScience郭福郭福教授教授北京工业大学北京工业大学材料科学与工程学院材料科学与工程学院CollegeofMaterialsScienceandEngineering材料科学基础材料科学基础材料科学基础材料科学基础CollegeofMaterialsScienceandEngineering2CollegeofMaterialsScienceandEngineeringCollegeofMaterialsScienceandEngineering3CollegeofMaterialsScienceandEngineeringCollegeofMaterialsScienceandEngineering4WarmingUpvWhatisconsideredasaneutecticreaction?

vWhatisconsideredasaneutectoidreaction?

vWhatisconsideredasaperitecticreaction?

L+共晶反应共晶反应+共析反应共析反应L+包晶反应包晶反应CollegeofMaterialsScienceandEngineeringFe-Fe3CPHASEDIAGRAM铁碳相图铁碳相图CollegeofMaterialsScienceandEngineering6IMPORTANCEOFFe-Fe3CSYSTEMvOfallbinaryalloysystems,theonethatispossiblythemostimportantisthatforironandcarbon.vBothsteelsandcastirons,primarystructuralmaterialsineverytechnologicallyadvancedculture,areessentiallyiron-carbonalloys.钢铁是是现代机械制造代机械制造业中中应用最用最为广泛的金属材料。

广泛的金属材料。

vThefocusofthislectureistostudythephasediagramforthissystemandthedevelopmentofmicrostructures.铁碳系碳系统及其及其显微微组织的演的演变vTherelationshipsbetweenheattreatment,microstructure,andmechanicalpropertiesarebasedonthephasediagramofthissystem.CollegeofMaterialsScienceandEngineering7CollegeofMaterialsScienceandEngineering材料科学基础什么知识最重要材料科学基础什么知识最重要?

您要找的是不是您要找的是不是:

铁碳相图铁碳相图CollegeofMaterialsScienceandEngineering铁碳合金相图是研究铁碳合金的基础。

它是研究铁碳合金的成分、温度和组织结构之间关系的图形。

铁碳合金相图是人类经过长期实践并进行大量科学实验总结出来的。

LetsseehowTalkingTomsaysCollegeofMaterialsScienceandEngineering10Fe-Fe3CPHASEDIAGRAMvIntheirsimplestform,steelsarealloysofIron（Fe）andCarbon（C）.ACDEFGSPQ1147727LAL+A4.3%C2.14%C0.0218%C6.69%CFeFe3CLdLd+Fe3CA+Ld+Fe3CFA+FP0.77%CLdK（P+Fe3C）P+Ld+Fe3CLd+Fe3CP+FP+Fe3C（F+Fe3C）A+Fe3CL+Fe3C（A+Fe3C）CollegeofMaterialsScienceandEngineering11Fe-Fe3CPHASEDIAGRAMvTheFe-CphasediagramisafairlycomplexoneACDEFGSPQ1147727LAL+A4.3%C2.14%C0.0218%C6.69%CFeFe3CLdLd+Fe3CA+Ld+Fe3CFA+FP0.77%CLdK（P+Fe3C）P+Ld+Fe3CLd+Fe3CP+FP+Fe3C（F+Fe3C）A+Fe3CL+Fe3C（A+Fe3C）CollegeofMaterialsScienceandEngineering12Fe-Fe3CPHASEDIAGRAMvWewillonlyconsiderthesteelandcastironpartofthediagram,uptoaround7%Carbon.ACDEFGSPQ1147727LAL+A4.3%C2.14%C0.0218%C6.69%CFeFe3CLdLd+Fe3CA+Ld+Fe3CFA+FP0.77%CLdK（P+Fe3C）P+Ld+Fe3CLd+Fe3CP+FP+Fe3C（F+Fe3C）A+Fe3CL+Fe3C（A+Fe3C）CollegeofMaterialsScienceandEngineering13CollegeofMaterialsScienceandEngineeringCollegeofMaterialsScienceandEngineering14CollegeofMaterialsScienceandEngineeringCollegeofMaterialsScienceandEngineering15WHATDOYOUKNOWABOUTIRON?

-ferrite铁素体铁素体-solidsolutionofCinBCCFeStableformofironatroomtemperature.ThemaximumsolubilityofCis0.022wt%.TransformstoFCC-austeniteat912oC奥氏体奥氏体CollegeofMaterialsScienceandEngineering16WHATDOYOUKNOWABOUTIRON?

-austenite奥氏体奥氏体-solidsolutionofCinFCCFeThemaximumsolubilityofCis2.14wt%.TransformstoBCC-ferriteat1394oCIsnotstablebelowtheeutectoidtemperature（727oC）unlesscooledrapidlyCollegeofMaterialsScienceandEngineering17WHATDOYOUKNOWABOUTIRON?

-ferrite-铁素体铁素体-solidsolutionofCinBCCFeThesamestructureas-ferriteStableonlyathighT,above1394oCMeltsat1538oCCollegeofMaterialsScienceandEngineering18WHATDOYOUKNOWABOUTIRON?

Fe3C-ironcarbideorcementiteThisintermetalliccompoundismetastable,itremainsasacompoundindefinitelyatroomT,butdecomposes（veryslowly,withinseveralyears）into-FeandC（graphite）at650-700oC渗碳体渗碳体CollegeofMaterialsScienceandEngineering19AFEWCOMMENTSABOUTFe-Fe3CvCisaninterstitialimpurityinFe.Itformsasolidsolutionwith,phasesofiron.vMaximumsolubilityinBCC-ferriteislimited（max.0.022wt%at727oC）-BCChasrelativelysmallinterstitialpositions.vMaximumsolubilityinFCCausteniteis2.14wt%at1147oC-FCChaslargerinterstitialpositionsCollegeofMaterialsScienceandEngineering20MECHANICALPROPERTIESvCementiteisveryhardandbrittle-canstrengthensteels.vMechanicalpropertiesalsodependonthemicrostructure,thatis,howferriteandcementitearemixed.CollegeofMaterialsScienceandEngineering21MAGNETICPROPERTIESv-ferriteismagneticbelow768oC.vAusteniteisnon-magnetic.CollegeofMaterialsScienceandEngineering22CollegeofMaterialsScienceandEngineeringCLASSIFICATIONOFFERROUSALLOYS铁碳合金的分类铁碳合金的分类铁碳合金的分类铁碳合金的分类CollegeofMaterialsScienceandEngineering23CLASSIFICATIONOFFERROUSALLOYSCommerciallypureiron（C0.02%）Steel（C:

0.022.14%）CastIron（C:

2.146.70%）CollegeofMaterialsScienceandEngineering24CLASSIFICATIONOFFERROUSALLOYSEutectoidSteel（C=0.76%）共析钢共析钢Commerciallypureiron（C0.02%）Steel（C:

0.022.14%）CastIron（C:

2.146.70%）CollegeofMaterialsScienceandEngineering25CLASSIFICATIONOFFERROUSALLOYSCommerciallypureiron（C0.02%）Steel（C:

0.022.14%）CastIron（C:

2.146.70%）HypoeutectoidSteel（C0.76%）亚共析钢亚共析钢CollegeofMaterialsScienceandEngineering26CLASSIFICATIONOFFERR