简介：Anewapparatuswasdesignedtomeasuretheelectromagneticforceandacomputationalstudyofthetravelingmagneticfield(TMF)anditsapplicationtotheGa-In-Snmelt(withlowmeltingpoint),thentheforcesonAl,Mg,andLimelt,weresimulated.TheresultshowthattheelectromagneticforceonthemeltincreaseslinearlywiththeincreasinglengthofthemeltintheTMF.TheTMF-inducedLorentzforceincreaseswithincreasingfrequency,andthendecreases.Themaximumvalueisobtainedwhenthecurrentfrequencyis160Hz,overthatfrequencytheforcedecreasesrapidly.Whentheiron-coreisactivated,theforceincreaseswhenthemeltclosestotheiron-core.TheLorentzforceshaveinversely-proportionalrelationshipswiththeelectricalresistivity,thedfx/dρdecreasesandthedfy/dρincreaseswiththeincreasingelectricalresistivity(df/dρistheslopeoftheLorentzforceprofile).

简介：Inthispaper,laserinducedplasmasignalswereanalyzedduringkeyholeweldingthroughthreemethods.Accordingtotheresults,therelativitybetweenopticalandacousticsignalsofplasmaisshownwhenweldsareinfull-penetration,orpartial-penetrationandnon-penetration.

简介：在长期的rheological砍有半固体合金的实验，粒子变粗将窜改试验性的结果的解释。变粗被shear加强导致的传送对流和粒子的吝啬的尺寸在实验期间显著地被改变。一个简单模型被建立了它考虑传送对流的影响。产生生长法律被简化了因为散开和传送对流统治了生长。生长法律被验证与砍在有A356和听铅合金的一个Searl电流计的实验。实验证明在传送对流下面，生长跟随一条线性时间法律并且率常数取决于shear率的根。试验性的结果的修正被表明获得真粘性功能为一shear跳有A356的实验。

简介：Theweldedjointofdissimilarheat-resistingsteels20Crl2MoV(F12)and12Cr2MoWVTiB(102)generallyworksaround600°C.Inthispaperthreekindsofferriticelectrodesareusedfortesting.TheyareR817high-strengthelectrode(CrllMoVNi),R347low-strengthelectrode(Cr2MoVWB)andnewly-developedR507MoNbmedium-strengthelectrode.Thestudyontheinfluenceofthosethreedifferentelectrodesoncarbonmigration,HICandhy-drogendiffusionshowsthatmedium-strengthelectrodescanwellcontrolthecarbonmigration,andthatthetendencytoHICinthejointformedbyR817issmallerthanthatbyR347instead.Consideringtheeffectofweldmetaltransfor-mationontherestraintstressandhydrogenconcentrationofajoint,thehydro-gendistributionintheheat-affectedzone(HAZ)iscalculatedbyusingfiniteele-mentmethod(FEM)withstressandstrainchanging,andsotheeffectofthetransformationbehaviouronHICisrevealed.Inaddition,newly-developedR507MoNbelectrodes,testedtheelevated-temperatureproperty,oxidationre-sistanceandcreeprupturestrength,havefulfilledthetechnicalstandardscon-cernedandpassedtheexaminationofon-the-spotoperation.

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简介：Themicrostructureofstress-inducedmartensite(SIM)inthenanocrystallineNiTialloywasinvestigatedbymeansoftransmissionelectronmicroscopy(TEM).Theresultshowsthatthemulti-variantstructureofthemartensiteissuppressedandonlysingle-variantmartensitictwinsformaftertensiledeformationwhenthegrainsizeissmallerthan80nm.Thenormaldirectionsofthe(001)B190twinplanesareallwithintherangeof45°fromtheaxialdirectionofthewire.Theanglebetweentwincrystals(1'11)Mand(111)ToftheSIMisalsofoundtobesmallerthanthatofthermallyinducedmartensiteinnanocrystallineNiTi.

简介：Theenergydepositionforlow-energyelectronbeamonSi-SiO2modelswascalculatedbyMonte-Carlomethod.Makinguseofelectronparamagneticresonance(EPR)technique,aninvestigationoftheeffectofdopanttypeandconcentrationonEPRsignalvariationswascarriedoutbyusingp-typeandn-typesilicon(111)waferswithconcentrationof1×1015cm3and1×1017cm3,andthechangesofintensityofdefectparamagneticcentersbeforeandafterirradiationofelectronswerecompared.Thechemicalstatesof...

简介：Inthispaper,themicrostructureandhardnessofHG980Dheat-affectedzone(HAZ)atdifferentcoolingratet8/3werestudied,theimplantcriticalfracturestressunderthreediffusiblehydrogenconditionsweremeasured,andthehydrogen-inducedcracking(HIC)fractographofsteelHG980Dwereanalyzed.TheexperimentalresultsshowthatmartensiteexistsinHAZofHG980Dtillt8/3≥150s,thehardenquenchingtendencyofHG980Disgreater;Theimplantcriticalfracturestressisrelatedtodiffusiblehydrogencontentsignificantly,atlowhydrogenlevel,highrestraintstressisneededtonucleateHIC,thefractographismainlymicrovoidcoalescence,butathighhydrogenlevel,onlysmallrestraintstresscancauseHICoccurrence,thefractographismainlyquasicleavage.Itisveryimportanttochooseultra-lowhydrogenweldingconsumabletoweldsteelHG980Dtopreventhydrogen-inducedcracking.