控軋控冷工藝對高碳合金鋼組織和力學(xué)性能的影響.pdf

1、東南大學(xué)碩士學(xué)位論文控軋控冷工藝對高碳合金鋼組織和力學(xué)性能的影響姓名：葉慧麗申請學(xué)位級別：碩士專業(yè)：材料學(xué)指導(dǎo)教師：蔣建清涂益友20061201東南大學(xué)碩士學(xué)位論文Abstractgraduatestudent：YeHuiliprofessor：JisngJianqingSoutheastUniversityControlledrollingandcoolingw笛widelyusedinimprovingthemicrostrnctu

2、reofsteelandenhancingitspropertiesInthispapertwoaspectswerestudiedbymeansofthermosimulationtestOneWasresearchingtheeffectofcontrolledrollingandcoolingoRmicro舭ofGCrl5andprodnctingthebearingsteelfleespheroidizationannealin

3、gthroughcontrolledrollingandcoolingTheotherwasstudyingtheeffectofcontrolledrollingandcoolingOllthegrainsizeofspringsteel60Sit、峨ItwasfoundthatcontrolledrollingandcoolingprocessaffectedmicrosUuctureofbearingsteelGCrl5remar

4、kablyAfterhightemperaturerollingdcformationaB咖iteUansfen_edintodegeneratepearlitewith01℃，scoolingrateinwhichtherearcalotofsphericalcemeotiteWithmorefastcoolingratecarlgetbainiteandmartensiteeasilyWhendeformation砒zoIleofd

5、oublepl麟ⅫobtaindistortionpearlitewithexbrafmepiecesButc∞notgetgoodspberoidizedsuuctlatbycontrolledrollingandcoolingdirectlyundertheexperimentalconditionsinthisstudyCarbidespheroidizationbehaviorandmechanicalpropertiesoft

6、hesteelusedinasrolledconditionWCllgstudiedafterintercriticalandsubcriticalannealingcyclesItwasfoundaconsideratelyhighlevelofspheroidizafioncouldbeobminedwhenconventionalrolledmaterialprocessintercriticalannealingButthesp

7、heroidizingtimeislongabout915hoursonetimeBesidesconventionalrolledsteelused缸tainverylowlevelofspberoidization，onlygrainboundarywithhigherenccgyoccurspheroidizationn埠samplewithlowmllingtemperaturec柚acquirequitehighlevelof

8、spheroidizationaftersubcriticalannealingcyclesat710℃for2hThusthespheroidizationannealingtimeforGCrl5steelcouldbesignificantlyreducedthroughmodifiedmllingandcoolingWhendetectingthespringsteel60Si2cm盯foundthatitexistspecif

9、icationoffectwhichsomebigspecificationsⅫpleSfacecontractratiocannotreach30％Thronghanalysisthemainc越№ofpropertydisqualificationisc∞№grainsizeInordertoinereasethequalificationratioJtmustgetfinegrainsizeThroughthetherraosim

10、ulationtestfoundthatausteniticgrainsize[momemorethinwithdecreasingthetemperatureandincreasingthetransformationdynamicrecrystallizationofaustanheinthezOI埒oflargesteffectiveplasticmaindoesnotbemostcompletewhileshears蚵nhasm

11、orestrongeffectondynamicrecrystallizationDynamicrecrystallizationoccmmostcompletelyinthezoneoflargestshearstrainmakinggrmnsizeminimumKeywords：conlrolledmllingandcoolingthermosimulationdegeneratepearlit島蜘idizationannealin