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《35CrMo截齒材料熱處理工藝優(yōu)化研究》由會員上傳分享，免費在線閱讀，更多相關內(nèi)容在學術論文-天天文庫。
1、密級公開分類號TG161XI’ANTECHNOLOGICALUNIVERSITY碩士學位論文題目:35CrMo截齒材料熱處理工藝優(yōu)化研究作者：黑體4號徐芳芳指導教師：程巨強教授申請學位學科：材料學2018年5月5日OptimizationofHeatTreatmentTechnologyfor35CrMoPickMaterialsDiscipline:MaterialScienceStudentSignature:SupervisorSignature:AbstractTheeffectsofdifferenth
2、eattreatmenttechnologiesonthemicrostructureandpropertiesofthe35CrMocuttingpicksteelwereresearchedthroughheattreatmentoptimizationexperiments,mechanicalpropertiesandmicrostructureanalysis,andthemorphologyobservationontheimpactspecimenfractionthroughtheScanning
3、ElectronMicroscopy(SEM).TheresultsshowthattheAc1andAc3phase-transitiontemperatureofthe35CrMosteelmeasuredbythehardnessmethodare750°Cand800°Crespectively.Withtheincreaseofthequenchingtemperature,thestrengthandhardnessoftheexperimentalmaterialsshowadownwardtren
4、dafterthehigh-temperaturetempering.Theoptimumquenchingtemperatureis800°C.Afterquenchingandhigh-temperaturetemperingforthe35CrMocuttingpicksteelbelow800°C,themicrostructureoftheexperimentalmaterialsaremainlycomposedofsorbiteandasmallamountoffinemassiveferrite,
5、afterquenchingandhigh-temperaturetemperingbeyond800°C,themicrostructureoftheexperimentalmaterialiscomposedofsorbite.Whenthequenchingtemperatureat800°Candholdingdifferenttime,thepeakoftheimpacttoughnessappearswhenholding40min,theoptimumheatingandquenchingtechn
6、ologyoftheexperimentalmaterialis800°C×40min.Whenquenchingat800°C,thetendencyoforganizationcoarseningoftheexperimentalmaterialsindifferentholdingtimeisnotobvious.Aftertemperinginhightemperature,alltheimpactfracturesoftheexperimentalmaterialsaretoughnessfractur
7、emorphology,andasmallamountofsulfideandoxideinclusionsexistontheimpactfractures.Whenquenchingat800℃andholding40min,andtemperingindifferenttemperatures,thehardnessandthetensilestrengthoftheexperimentalmaterialsshowadecreasingtrendwiththeincreaseoftemperingtemp
8、erature.Thetemperingbrittlenessappearswhentemperingtemperaturereaches300℃.Whentemperingat500°C,thehardnessandstrengthoftheexperimentalmaterialtendtodecreasewiththeincreaseoftheholdingtime
