半固态连铸M2高速钢坯料的特性研究

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1、北京交通大学硕士学位论文半固态连铸M2高速钢坯料的特性研究姓名：勾军年申请学位级别：硕士专业：载运工具运用工程指导教师：邢书明20071101北京交通大学硕士学位论文ABSTRACTABSTRACT：Highspeedsteel(HSS)iswidelyusedincuringtools，moulds，rollersandkeypartsofvehicle．Improvingqualityanddomesticlevelofhigh-speedsteelproductshasagreatsignificancetothedevel

2、opmentofthevehicleindustry．Euteeticcarbidesofas．castmicrostructureofHSSarecoarsenetworkstructure，whichaffectsitshotprocessingandeventheservicepropertiesofproducts．But,atpresent，theseexistingimprovingHSSrnicrostrueturemethodsareunsatisfactory．h1ordertosolvethisproblema

3、ndrealizethehigh-qualityandhigh-efficiencycastingproduction,thisresearchproposesthesemi-solidcontinuouscastingtechnologytopmducoHSSfirstly．Intheresearch，appropriatesemi—solidcontinuouscastingprocessisestablished，M2HSScastingbilletisproducedbycooling-platesemi·solidcon

4、tinuouscastingmachine,andthethermalprocessingperformanceandservicepropertiesareinvestigatedtovalidatethepracticalityofthisnewtechnology．Theresultshowsthatthesemisolidcontinuouscastingtechnologycouldresolvetheserioussegregationofcarbidesincastingmicrostrueture．Thegrain

5、softheM2HSSsemi—solidcastingbilletarefine—round·-equiaxedgrainswhicharenotdendritesasproducedbyconventionalcasting,andtheeutecticcarbidestumintothinandbrokennetworkfromcoarsenetworkstructure．Asaresult，thischangeofmicrostruetureinevitablyleadstotheimprovementonthermopl

6、asticprocessingperformance．Althoughitsbesthotplastictemperaturerangeisn’tchangedundertheconditionofuniaxialstress，whichisfrom900℃to1200℃asconventionalstate,but,alongwiththeincreasingtemperatureinthetemperaturerange，semi-solidbillet’Sthermoplasticisincreasinglybetterth

7、antheconventionalstate’s．Andalsothecarbidedistributionturnsbetterafterbeingforged．Moreover,semi-solidcontinuouscastingtechnologyimproveshardness，impacttoughnessandredhardness，theservicepropertiesofM2HSSaremuchhigherthantheconventionalstate．KEYWORDS：M2HSS；Semi—solid；Co

8、ntinuouscasting；Eutecticcarbide；HotplasticityCLASSNO：TG249．7学位论文版权使用授权书本学位论文作者完全了解北京交通大学有关保留、使用学位论文的规定。特授权北京交通大学可以将学位论文的全部或部