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1、武漢科技大學(xué)碩士學(xué)位論文真空感應(yīng)熔煉過(guò)程爐襯供氧對(duì)鋼液深脫氧影響姓名:高俊波申請(qǐng)學(xué)位級(jí)別:碩士專(zhuān)業(yè):鋼鐵冶金指導(dǎo)教師:薛正良20060525第Ⅱ頁(yè)武漢科技大學(xué)碩士學(xué)位論文AbstractAsallimportantmethodformeltingandpurifyingmoltensteel,vacuuminductionmelting(VIM)canprovideasuperiorcircumstanceofoxidizationav

2、oidanceundervacuumandgoodelectromagneticstirringfordegassingtreatmentincludingdehydrogenationdenitrificationdeoxidizationeteHoweverduringVIM,tosomeextentcruciblematerialmaycontaminatethemoltensteelbyheatdecompositionforc

3、ontactThroughthermodynamicstudyOntwotypesofbasiccruciblesmagnesiacrucibleandcalciacrucibleusedgenerallyinvacuuminduction缸nace(VIF),itisconcludedthatthesetwotypesofcruciblesCallcontaminatethemoltensteelbyheatdecomposition

4、toincreasetheoxygencontentundertheconditionofsomemeltingtemperature,meltingvacuityandoxygencontentofthemoltensteelandthatthetrendtowardsheatdecompositionofthecruciblesviiirisewiththeincreasingoftemperatureandvacuityandwi

5、ththedecreasingofthedissolvedoxygencontentofthemoltensteelUnderhightemperatureandvacuumcalciacruciblehasbetterresistancetothermalchockandbetterchemicaldenudationthanmagnesiacrucible!Duringtheactualproductionthattheoxygen

6、contaminationfromthecruciblematerialby:。heatcompositionincreasestheoxygencontentofmoltensteelwillresultinmeltinglossesofthe0alloysinthemoltensteel,andwillresultsinmoreheaviermeltinglossesofthealloys,incontrollableexactch

7、emicalcontentofmoltensteel,incrementofoxideinclusionsandbadprocessabilityandserviceabilityespeciallyinthehi曲strength(oh/1600MPa)steelsandalloyswithspecialperformanceusedinaerospaceindustrymanufacturingindustryforprecisio

8、ninstrumentsandmeters,militaryindustrynuclearindustryetebecausethesesteelsusuallyhaveahighcontentofsomeactivealloyssuchasTi,VNb,Al,RE,etcandanearlyZerOcontentofdissolvedoxygenSo,usingmagnesiaandcalciacrucibleinVIFrespect

9、ivelytheexperiments011deepdeoxidationbycarbonandthephenomenonofoxygencontaminationfromcruciblematerialsinthemoltensteelundersometemperatureandvacuityandoxygencontentofthemoltensteelweremadeandtheywerefoundthatproperlylow

10、meltingtemperatureandvacuityhelpedtolightenandevenavoidoxygencontaminationfromcruciblematerialandtherefining,n。,effectoffinaloxygencontentof5xi0“4%inthemoltensteelwasachievedusingcalciacruciblewithbetterresistancetotherm

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