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1、萬方數(shù)據(jù)江蘇大學(xué)碩士學(xué)位論文ABSTRACTInthelastfewyears，thevanadiummicroalloyednon-quenchedandtemperedsteelhasbeenwidelyusedinsuchasautomotive，petroleumandmachinerymanufacturingindustryforitslowcostandhighperformance．Generally,duetolackoftheheattreatment，thiskindofsteelhasahig
2、hproductionefficiencybutalowtoughness，andthegrainofVNcouldsignificantlyfacilitatethenucleationofintragranularferrite(IGF)，whichmakethegrainrefining．Therefore，inordertoobtainagoodoverallperformance，theprocessparametersatthethermalprocessshouldbeadjustedwhichcoul
3、dpromotethenucleationrateofIGF．Inthispaper，forthepurposeofstudyingtheprecipitationandthermaldeformationbehaviorofthevanadiummicroalloyednon—quenchedandtemperedsteel，twoexperimentalprocesseswerearranged，whichwerethestressrelaxationandsingle—passthermalcompressio
4、n．Theprecipitationkineticscurvesandtheconstitutiveequationwereobtainedbasedontheexperimentresults．Throughthestressrelaxation，thevanadium-carbonitrideprecipitatedbehaviorinaustenitewereresearchedunderdifferentexperimentalconditions，theresultindicatedasfollows：Th
5、edownwardtrendofstressslowdowneventhestressplateauappearsasthevanadium-carbonitrideprecipitate；Withtheendofthevanadium—carbonitrideprecipitating，thedownwardtrendofstressretumtothepreviousstatus，insomeconditions，therecouldbesecondaryeventhirdprecipitation，butthe
6、effectofstoppingthestressfromdecreasingisreduces；TheshapeofPTTcurvesgotfromthestressrelaxationcurveshasadoubleCtypecharacteristic．Andthefastestprecipitationtemperatureis650。Cbelow800℃，v(c，N)beginstoprecipitateat4sandendsat10．5s，thevanadium-carbonitrideprecipita
7、teatthistemperaturehasahighcarboncontent；inthemeantime，thefastestprecipitationtemperatureis870℃beyond800。C，V(C,N)beginstoprecipitateat1．6sandendsat3．5s，thevanadium-carbonitrideprecipitateatthistemperaturehasahighnitrogencontent。Alargeamontofvanadium．carbonitrid
8、eparticlesaredispersivedistributionat870℃and900。Cafterquenching．Theresultsoftwotypesofsteelwhicharevanadium-microalloyedsteelandcarbon—-manganesesteelbythesingle--passtherma
