組織細(xì)化對調(diào)質(zhì)中碳Cr-Mo鋼力學(xué)性能的影響.pdf

1、昆明理工大學(xué)碩士學(xué)位論文組織細(xì)化對調(diào)質(zhì)中碳CrMo鋼力學(xué)性能的影響姓名：張俊粉申請學(xué)位級別：碩士專業(yè)：有色冶金指導(dǎo)教師：施哲時捷20050110AbstractTheeffectofultra。finemicrostructure011themechanicalpropertiesofmediumcarbonCr—Mesteelwasstudiedwithopticalmicroscope，TEMandSEMThestudywasdiv

2、idedintothreepartsFirst，analyzedthequalityandmechanicalpropertiesofcastingslab；second，ultrafinemicrostructurewasobtainedbycircleheatingquenchingtreatment，anditseffectonmechanicalpropertiesisdiscussedinthispaper；third，stu

3、diedtherecrystallizationandgrainrefinementoftestedsteelthroughthermalsimulatetestThemacrographofslabindicatedthatwecanincreasethequalityofcastingslabbydecreasingtheteemingtemperature、usingelectromagneticstirringandsoftre

4、ductiontechniqueincontinuouscastingproceedingAndthehighqualitiesofslabbringUSthehighmechanicalpropertiesofsteelStudiedondifferentaustenitegrainsizesofquenchedandtemperedsteel，wecansee，grainrefinementisanefficientmethodto

5、improvebothstrengthandtoughness，buttheinfluenceofgrainsizeonstrengthisnotobvioustoquenchedandtemperedsteelThetoughnesshasgreatlyimprovedwithdecreasingtheaustenitegrainsize，especiallyofthelowtemperaturetoughnessAndtheduct

6、ile—brittletransitiontemperaturewasimprovedbygrainrefinement。ButthereisalittledecreasewiththeductilityTheseresultsindicatedthatstrengthenbringbypuregrainrefinementislimitedtoquenchedandtemperedmediumcarbonsteel，andthemai

7、npurposeofgrainrefinementistoimprovethetoughnessFurthermore，theincreasingrangeoftoughnessbroughtbygrainrefinementdifferfromdifferentparts(surfaceandcenter)anddifferentdirections(transverseandlengthways)becausethesize，dis

8、tanceandshapeofinclusionsaredifferentWecanobtainthefinegrainsizeabout1OhmbytwopathsdeformationSothegrainrefinementcanbeobtainedbycontrolrollingandcoolinginpracticeproductionKEYWORDS：continuouscastingslab；mediumcarbonstee