X100管線彎管的組織-性能研究.pdf

1、西安石油大學碩士學位論文X100管線彎管的組織性能研究姓名：趙春申請學位級別：碩士專業(yè)：材料學指導教師：高惠臨霍春勇20080520英文摘要：StudyonMicrostructure&PropertyofXl00PipelineBends：MaterialScience：ZhaoCh玨鼗(signatu怒)蘭虹逝GaoHuilin(signature)H：友j壘ABSTRACTInthispapertheContinuousCooli

2、ngTransformation(CCT)curveofX100pipelinesteelisestablishedThephasetransformation，thestrengthtoughnessandthemicrostmctureduringthemanufactureprocessofXl00pipelinebendsaresystematicallystudiedbymeansofheatsimulationtechniq

3、ue，mechanicalpropertiestestandmicroscopicanalysismethodTheresultsofphasetransformationanalysisshowthatwhenthecoolingrateislowerthanO2℃露，themicrostructureofX100pipelinesteelismainlymadeupofPEQFGFaleformedinacoolingrateran

4、geofO510。C／sWhenthecoolingrateishigherthan20℃／s，themicrostructureofX100primarilyincludesBEAndthecoolingratehigherthan504C／smayformL】MBytheorthogonalexperiment，theoptimumhotworkingparametersofX100pipelinebendsiSchosen，whi

5、chiSasthebaseoffurtherstudiesTheresearchindicatesthatthestrengthraisesandthetoughnessdecreaseswiththeincreasingofheatingtemperatureWhenthetemperaturerangesis950℃～1050。C，itCangetfinegrainandBFGFwhichcallbringexcellentstre

6、ngthandtoughnessforXI00Whentemperatureishigherthan1050“(2，thegrainsofX100growverycoarse，sothetoughnessdecreasesWhentemperatureisbetweenAcl～Ac3，thestrengthdecreasesbecauseofPFThetestingresultsshowthatitCangethighstrengthw

7、henthecoolingrateisimprovedUsingwaterasthecoolingmedium，itCangetBFAFandthemicrostructureofmulti—directiondistributedBFandfineeffectivegrainsensureexcellentstrengthandtoughnessforX100。QFformedincoolingmediumofairandMforme

8、dincoolingmediumofsalinewaterCanbotllreducethestrengthandtoughnessofX1OOTheresultsalsevealthatwhilethetemperatureisabout5∞℃050℃，itcallgetfinestrengthtoughnessAndthestrength—toughnessofstraightsectionsofpipemaybehighertha

9、nbasemetalandthestrengthtoughnessofbendsmaybeequivalentwithbasemetalbysuitabletempertreatmentDuringtheprocessoftempertheprecipitateofcarbidenitrideandtherecrystallizationofpartialgrainsaleofbenefittohighstrengthAndthevar