熱軋雙相鋼組織性能研究.pdf

1、東北大學碩士學位論文熱軋雙相鋼組織性能研究姓名：王魁周申請學位級別：碩士專業(yè)：材料加工工程指導(dǎo)教師：孝云禎丁樺20060201東北大學碩士學位論文摘要ABSTRACTDHalPhaseSteeliSasorthighincipientworkhardeningofnewstylestampingsteelwithlowyieldpoint，rate，highstrengthandgoodductility，andithascompreh

2、ensiveapplicationinautomobileproductionDualPhaseSteelcouldrelieveselfrespectingabout20％atautomobile(especiallyincars)structureIthasveryimportantrealisticsignificancetostudyanddeveloplowcosthotrolleddualphasesteelsforthew

3、orldwideaimstesourcessaving，reductionofenergyconsumptionandcontinuousdevelopmentTheresearchobjectismostlyhotrolledDualPhaseSteel，aD_dexperimentstudyonthermalsimulationandcontrolledrollingandcontrolledcoolinghavebeencarri

4、edoutAccordingtotheexperimentalresultandalloydesignprinciple，anexperimentalsteel，C—Si—Mnsystemdualphasesteelincludingchromic，isdesignedandalloycompositionisO06C一06Si一15Mn一06CrAlloycompositionisO08C05Si一10Mn一05Cr一04Mothet

5、ensilestrengthreaches700MPaandelongationisabout18％withaverageferritegrainsizeof81xm～10扯mandvolumefactionofmartensiteofI5％22％，whenfinishingtemperatureis850℃andwater—coolingstarttemperatureis650。Cthecoolingrate100℃／sAtthes

6、ameschedule，alloycompositionisO06C一06Si一15Mn一06Cr，thetensilestrengthis500MPaandelongationis33％Butthoughincreasingwater—coolingstarttemperatureto750℃AlloycompositionisO08C05Si一10Mn一05Cr一04Mo，ithasbeengottenbettercombinati

7、onofmechanicalproperties：loweryieldratio，higherstrainhardeningandtensilestrengthis600MPaandelongationis33％Theferriteaveragegrainsizeis609mandmicrostructureconstituentsareferritemartensiteandbainiteAlloycompositionisO06C0