高热强性热作模具钢的合金化特性.研究

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1、上海大学硕士学位论文高热强性热作模具钢的合金化特性研究wasfoundthattheimpacttoughnessatelevatedtemperaturehasremarkablelinearrelationshipwith(impacttemperature-556)2．2．CandMohadthetendencytolowertensilestrengthwhileVhadtheoppositeeffect；CandVhadthetendencytoloweryieldstrength，butMohadtheoppos

2、iteeffect；CandVhadthetendencytoincreaseelongation；C．Cr,MoandVhadthetendencytoincreaseareareduction．3．Proposedthemeasurementcriteriatovaluetheobdurabilityofhotworkdiesteeltentatively：Hardness-toughnessfactor(HT)andstrength-toughnessindex(STI)．ItWasfoundthatquenching

3、temperatureandtemperingtemperaturehadthetendencytoincreaseHTwhileC，MoandVhadtheoppositeeffect；temperingtemperaturehadthetendencytoincreaseSTI，butC，Mo，Vandquenchingtemperaturehadtheoppositeeffect．4．C，CrandVhadthetendencytolower氏l，asthecontentofMnincreases，氏1willfirs

4、tincreaseandthendecrease，thecontentofMnattheturningpointisO．354％；CandVhadthetendencytolower氏3；Si，Mn,CrandVhadthetendencyto10werMs．5．MnandtemperaturehadthetendencytoincreasethethermalexpansioncoefficientofthesteelatannealedstatewhileSihadtheoppositeeffect；C，Si，Vandt

5、emperaturehadthetendencytoincreasethethermalexpansioncoefficientofthesteelatquenchedstatewhileCrhadtheoppositeeffect．6．Si．Mn,CrandVhadthetendencytoincreasethenosetemperaturesofbainitetransformationregion；Mohadthetendencytoincreasethenosetemperaturesofpearlitetransf

6、ormationregionwhileC，CrandVhadtheoppositeeffect；Chadthetendencytolowerthecriticalcoolingratesofmartensite；Mohadthetendencytolowerthecriticalcoolingratesofmartensite，besides，谢廿ltheincreaseofthecontentofSi，thecriticalcoolingratesofbainitewillfirstincreaseandthendecre

7、ase，thecontentofSiattheturningpointisO．7994％．7．Si，CrandVhadthetendencytoincreasethermo-stabilityofthesteelswhentestedunder650℃．8．C，CrandVhadthetendencytolowerthermalfatiguepropertyofthesteel，VIII上海大学硕士学位论文高热强性热作模具钢的合金化特性研究withtheinhereofquenchingtemperature，thermal

8、fatiguepropertyofthesteelwillfirstincreaseandthendecrease，thecriticalquenchingtemperatureis1073℃．9．Fournewsteelsweredesignedbased011theresultsofe