Effect of controlled rolling and controlled cooling process on microstructure of Ti-alloyed pipeline for CSP-中国Betway体育网页登陆

摘要 Thepipelinesteelisusuallyproducedbyaddingniobiumandvanadiumalloyingelements.Thetitaniumalloyedpipelinesteelwasstudiedinthepapertoreducetheproductioncostandenhancethecompetitiveabilityofpipelinesteel.Thesteelcontaining0.070%Tiwasrefinedinthelaboratoryvacuumrefinefurnace.ThedynamicCCTcurveofdevelopedsteelwasconductedonGleeble-1500thermalsimulatorandmulti-passdeformationtestsofstudiedpipelinesteelwereperformedtosimulatetheCSPhot-rollingtechnology.Correspondingmicrostructureswereobservedandtheinfluencesofsuchtechnologyparametersasdeformationstrain,deformationtemperature,coolingrateandfinishingtemperatureetc.onmicrostructurewereanalyzed.ThedynamicCCTcurvewasobtained.ThetestresultsshowedthatthevolumefractionofacicularferriteinthemicrostructureofTi-microalloyedX70pipelinesteelincreasedobviouslywiththeincreaseofcoolingrateafterthermo-mechanicaldeformation.However,thevolumefractionofacicularferritevariesscarcelyafterthecoolingrateof20℃/s.InordertoobtainTi-microalloyedX70pipelinesteelwithexcellentcompoundmechanicalpropertieswhichhasacicularferriteasthemainidealmicrostructure,thecoolingrateshouldbecontrolledtobe20℃/sormore.Thehigherofthefinishingtemperature,themoreofthevolumeofacicularferriteandthelessofthevolumeofpolygonalferrite.Thequitefinemicrostructurecanbeobtainedbyloweringthefinish-coolingtemperature.TheresultshaveshownthatitispossibletoproducetheTi-additionX70pipelinesteelfromthepointofviewofmicrostructure.

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Effect of controlled rolling and controlled cooling process on microstructure of Ti-alloyed pipeline for CSP

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