304不锈钢高温力学性能与热物理性能分析

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1、内蒙古科技大学硕士学位论文AbstractIntheconcasting304stainlesssteelproducedbyTaiSteel,thesurfaceofslabisliabletocausedefects,suchassurfacecrackandpitflaw.Inthispaper,adoptingthe304stainlessasrawmaterials,thetypeGleeble-1500Dthermalsimulationtestingmachine,theDIL40

2、2Cthermaldilatometer,STA449F3thermalanalyzerwereemployedtotestthemechanicpropertiesathightemperature,linearexpansioncoefficient,DSCandCpcurveof304.Atthesametime,analysingtheeffectsofthethermologypropertiesandthemechanicalpropertiesforthequalityof304s

3、tainlesssteelslab,identfyingthecracingsensitivity,associatingwiththeprocessingtechniqueofcasting,optimizingtheprimaryprocessingtechnique,hopingtoachievedecreasingthedefectsofslab,likesurfacecrackandpitflaw.Theresultsofmechanicpropertiesathightemperat

4、ureindicatedthetensilestrengthandyieldstrengthdecreasedwithtemperatureincreasingduringthe7001400℃.Thetensilestrengthwasbelow25Mpaandtheyieldstrengthwas20Mpawhenthetemperaturewasabove1200℃.Itindicatesthattheabilityofslabtoresisttwistingatexternalforc

5、ebacameworseathightemperature.Thefirstbrittlenesstemperaturewas1300℃tomeltingtemperatureandthethirdbrittlenesstemperaturewas950～1050℃.Intherangeof1050～1250℃,thereductionofareawasover65%,thehotductilitywaswell.Thesurfacedefectsofslabwhichwaslocatedint

6、hesecondarycoolingareasandcontinuousstraighteningareascandecreaseeffectivelywhenthesurfacetemperatureofslabwascontrolledabove1050℃.Theresultsofthermrologypropertiesathightemperatureindicatedtherangeoflinear-6-6-6expansionwas18.86×10～21.34×10andthecon

7、tractioncoefficientwas18.57×10～-624.24×10.Thecoefficientsofexpansionandcontractionof304stainlesssteelareonthe-6wholegreaterthan2Cr13martensiticstainlesssteel(α=12.08×10)and20CrMostructural-6alloysteel(α=14.05×10).Sothe304stainlesssteelbelongstocracks

8、ensitivitysteel.ThecurveofCpwavesobviouslyduringthe1000~1400℃astemperatureraise.Becauseofthetransformationofcrystallineshapeoccurs,thebrittlenessofslabincreased.ThecurveofCpgeneratespeakvalueat1288℃.ItindicatesthattherewouldbeaphasetransformationII内蒙