当前位置 —论文—写论文— 范文

关于电化学方面论文例文,与医学学位文湖北,硕士学位文的通知相关毕业论文范文

本论文是一篇关于电化学方面毕业论文范文,关于医学学位文湖北,硕士学位文的通知相关毕业论文格式模板范文。免费优秀的关于电化学及合金及控制工程方面论文范文资料,适合电化学论文写作的大学硕士及本科毕业论文开题报告范文和学术职称论文参考文献下载。

marked.

2.Thevariousmathematicalmodelsarereviewedandappraised.Thedifferentprojectsofturbulencemodelareintroducedrelativelydetailedly.Comparingmultifariousmodelsandbiningpracticalinstance,wechoosemodelasthepaper'smodel.

3.Thetwodimensionalmathematicalmodelwhichdescribesmeltflowandgasbubblethicknessincourseofneodymiumelectrolysishasbeenestablishedbyapplyingtwi-equationsmodelwhichismentbyadoptingBoussinesqapproximationandboundarylaminarflowhypothesis.Thenwedefinetheboundaryconditionsandsuccessfullyresolvethequantitativedepictingproblemofmeltflowandgasbubblesdistributioninmeltingbath.

4.Thecontrollingequationsaredispersedbyfinitedifferentialmethod.Wehavetransferreddifferentialequationstoalgebraicequations.Onthebasisofthefront,wedesigncalculationalareaandgriddingandpletetwodimensionalprogramflowchartwithSIMPLEmethod.

5.Wepilethesubroutineofthicknessandmakeit,thesubroutineofvelocityandsooncouplebymodifyinginbeingprogram.Weultimatelygaintheprogramwithhighercalculationalprecisionandbetterastringency.

6.Weevaluatetheaveragediameterofgasbubbles,calculatetheascendingvelocityofgasbubblesandreckonthevolumepercentageofgasbubblesinmeltingbath(meltingpartment,meltingcharge).

7.Throughtheprogram,thethicknessdistributionofgasbubblesandmeltflowfieldwithdifferentthedepthofthepolesinserted,thedistancebetweenthepolesandopeningholesonpositivepolehavebeensimulatedandcalculatedin3KAneodymiumelectrolysiscell.

医学学位文湖北,硕士学位文的通知参考属性评定
有关论文范文主题研究:	关于电化学的论文范文数据库	大学生适用:	硕士毕业论文、函授毕业论文
相关参考文献下载数量:	67	写作解决问题:	如何写
毕业论文开题报告:	文献综述、论文总结	职称论文适用:	期刊目录、初级职称
所属大学生专业类别:	如何写	论文题目推荐度:	优质选题

8.Intermsofcalculatingresults,withexistingresearchfulfruitsandonspotoperationaldatabasis,weconcludethelawwhichtheelectrolysiscourseisaffectedbythethicknessofgasbubblesandmeltflowthroughparingandthoroughlyanalyzing.Theseworkswillofferthenecessarybase(basis)forthedesignofneodymiumelectrolysisfacilityandtechnologyflow.

Keywords:rareearth,neodymiumelectrolysis,electrolysiscell,anodicbubbles,thicknessdistribution,meltflowfield,numericalsimulation

论文题目:稀土对BNbRE钢组织及性能的影响

TheEffectofREonMicrostructureofBNbRESteel

研究生姓名:杨丽颖

导师姓名:李春龙总工

专业:材料加工工程

摘要:

本文就稀土残留在钢轨钢中对其组织的影响展开了系统的研究.测定稀土对相变点的影响.研究了稀土对珠光体组织,奥氏体晶粒尺寸的影响,对热轧态及淬火态析出物碳化铌的大小,形状,分布的影响,对硫化物的形态的影响,在热轧态中对位错塞积以及位错与碳化铌交互作用的影响,对珠光体片间距,渗碳体形态的影响,以及稀土对热轧态带状组织的影响.

研究结果表明:对相变点测定发现随着稀土残留量增加,奥氏体向珠光体转变点Ar1Ar3降低,马氏体转变Ms点升高.对微观组织的研究主要比较了稀土残留量为0%和稀土残留量为0.0271%两种化学成分的试验钢的微观组织,由光学显微照片发现稀土细化奥氏体晶粒,用截线法测量其晶粒平均直径由34.48(m减小到26.32(m.扫描电镜背散射像发现稀土使热轧态析出物碳化铌尺寸减小,长由2.8~6.7(m减小到1.0(m~4.5(m,宽由1.1~1.7(m减小到0.3(m~0.8(m.形状由矩形或长条形转变为圆形.由分布在晶界或晶界附近变为分布在晶内或晶界上,带状分布形式减弱,部分碳化铌弥散分布在基体上.透射电镜观察发现稀土残留量为0%及稀土残留量为0.0021%碳化铌析出在铁素体与渗碳体交界处,稀土残留量为0.0271%碳化铌析出在两片渗碳体间的铁素体中部.稀土也使淬火态碳化铌尺寸减小,长由4.8~6.0(m减小到1.6~2.0(m,宽由0.4~0.9(m减小到0.5~0.6(m.稀土残留量为0.0271%时,碳化铌和稀土硫化物都沿轧制方向分布.在稀土硫化物附近析出的碳化铌为不规则形状,而在其它部位析出的碳化铌为规则的圆形,矩形或长条形.稀土改变了硫化物形状,由长条形变为圆形或椭圆形.稀土残留量为0%的试验钢中,透射电镜像发现在碳化铌的周围存在位错圈.珠光体片间距由0.25(m减小到0.20(m,渗碳体的形态发生了改变.

关键词:BNbRE钢微观组织交互作用相变点

ABSTRACT

ThepapersystemicallystudytheeffectofREonmicrostructureofrailsteel.ThecontentincludetheeffectofREonAgrainsize,theeffectofREonNbCofsize,shape,distribution.REonsufferpoundshape.TheeffectofREondislocationsblock.TheeffectofREondistanceofPbetweentwoPslicetheeffectofREonFe3CthicknessandtheeffectofREonheatrollbeltshapemicrostructure.

DeterminephrasetransformspotfindthatwithREremainquantityincreasingAr1Ar3spotthatAchangeintoPdecrease,MsspotthatMchangeincrease.

ThepapermainlyparetwoREremainquantityexperimentsteelofmicrostructure.TheyareREremainingquantity0%andREremainquantity0.0271%.Accordingtoopticmicroscopepicture,withREremainsquantityincreasingREmakeAgrainsizetiny.Agrainequallydiameterdecreasesfrom34.48(mto26.32(m.AccordingtoscanelectronicmicroscopepictureofBack-scatteredelectronicmicrostructuredifferentREremainquantityinheatrollstateandquenchstatemakeNbCshape,size,distributionchange.TheexperimentresultindicatethatheatrollstateNbCsizedecreaselengthfrom2.8~6.7(mto1.0~4.5(m,widefrom1.1~1.7(mto0.3~0.8(m.itsshapefromrectangletostriporcircular.Itsdistributionalsochangesfromonthegrainedgetograininnerandfromstripdistributiontodispersedistribution.ThelengthNbCafterquenchingdecreasefrom4.8~6.0(mto1.6~2.0(m.widedecreasefrom0.4~0.9(mto0.5~0.6(m.NbCandSpoundalternatewithalongrolldirectiondistribution.NearSpoundNbCshapebeeirregularbutatotherpositionNbCiscircularrectangleorstrip.REchangeSpoundshape,itsshapefromstriptocircularorellipse.

上一页 1 2 3 4 5 6 7 8 9 10 下一页