大气环境电子束材料表面强化机理数值模拟

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1、第37卷第2期火箭推进V01．37，№．22011年4月JouRNALoFRocKETPRoPuLsIoNApr．20l1NumericalsimulationformechanismofmaterialsurfacehardenlngbVhlghenergyeleCtrOnbeam1natmOspnereV．，Vv，一DENGYong．fen91，LINRon91，HANXian—weil，TANChan91，R．N．Rizakhanov2．A．A．Bamin2(1．ShaanxiPowerMachineDesigna11dResearchInstitut

2、e，Xi’an710l00，China；2．KeldyshResearchCenter，Moscow125438，Russia)Ab蛐阻ct：Arobustmulti—stagenumericalmodelisestablishedtoanalyzetheinteractionprocessandphase—stmcturetransfomwhichoccursinthematerialsurfacelayerduringthematerialsurfacehardeningbymeansofelectronbeam．Bythemodel，itgiVesac

3、alculationabilit)，ofthemodeltodealwiththemulti-parameterproblema“sing仔omelectronbeamtransportation，temperatureeVolutionandphasetransformdynamics．Therelationshipbetweentheinputparametersandfomationofstmc—ture—phaseisobtained．Ke)喇rordS：materialhardening；electronbeam；numericalmodelCLC

4、number：TB3Doalm伽tcode：A≯ⅡticleD：l672—9374(2011)02—0060—070IntroductionTheresearch丘eldofmaterialsurfacemodifica—tionbyusinghighenergyelectronbeamattractsmuchattention【1圳．Thebeamenergycanbetrans—fonlledintotheheatofmaterialsurfacelaverinveryshontime，thusthematerialsurfacelayertempera

5、-turechangesquickly，which1eadstoa伊eat伊adientofmaterialtemperature【5刊．Consequentlythematerialphaseandmicro—stmctureinsuchlayerchanges．Thistransfonllwouldalwaysimprovethematerialcharacteristics．However，thetraditionaltechniqueofthemodificationbvelectronbeamiscarriedoutinvacuum吵Thereby

6、，theemciencyis伊eatlylimitedandthemodificationcostisconsiderablvincreased．Inordertoresolvetheproblem，ainnovationaltech—niqueusingelectronbeamina仃nosphereispro—posed．withthistechnique，thehi曲energ)，electronbeamistransportedintoatmospherethroughamul—ti—leveldifjFerentialpumpingsection【

7、删．Theref．ore，thevacuumtechniqueisu1111ecessa巧formaterialmodi—fication．onecanusethebeamtohardenthematerialinatmospheredirectly，andthemodificationemcien—cycanbe伊eatlyimproVed．NotethattheprocessisdetenlainedbyseVeralfactors，suchasbeamenergy，beamcurrentandsurfacestmctures．Thusitmakesth

8、eprocessbecomeeVencomplica