典型文献
Multi-scale simulation of columnar-to-equiaxed transition during laser selective melting of rare earth magnesium alloy
文献摘要：
A model of coupling macro finite volume method(FVM)and cellular automata(CA)is proposed in this paper to explore the columnar-to-equiaxed transition(CET)during selective laser melting(SLM)of rare earth magnesium alloy.Taking into account the impact of recoil pressure and Marangoni convection on the molten pool temperature field,the grain structure is simulated.As suggested by the simulation re-sults,with the undissolved Zr serving as heterogeneous nucleation sites,the liquid undercooled layer un-der the combined action of forced cooling,the temperature gradient and the liquid solute concentration gradient leads to CET.While considering the dissolution of Zr in magnesium matrix,the results demon-strate that the dissolution of element Zr is effective in significantly inhibiting the growth of columnar crystals and ensuring the sufficient constitutional supercooling(CS)required for nucleation.In addition,to raise the preheating temperature contributes to enhancing the outcome of nucleation and incresing the grain size.Invoking the interdependence model(IM),with the cooling rate gradually increasing in the SLM process of magnesium alloy,the nucleation-free zone(NFZ)reduces by decreasing the solute diffusion layer in the front of the solid/liquid(SL)interface and the temperature gradient.The reduc-tion in temperature gradient can promote undercooling for nucleation and facilitate the development of equiaxed crystals.The simulation results are qualitatively verified as highly consistent through experi-mentation.
文献关键词：
中图分类号：
作者姓名：
W.L.Wang;W.Q.Liu;X.Yang;R.R.Xu;Q.Y.Dai
作者机构：
School of Metallurgical Engineering,Xi'an University of Architecture and Technology.Xi'an 710055,China
文献出处：
引用格式：
[1]W.L.Wang;W.Q.Liu;X.Yang;R.R.Xu;Q.Y.Dai-.Multi-scale simulation of columnar-to-equiaxed transition during laser selective melting of rare earth magnesium alloy)[J].材料科学技术（英文版）,2022(24):11-24
A类：
undissolved,incresing,Invoking
B类：
Multi,scale,simulation,columnar,equiaxed,transition,during,laser,selective,melting,rare,earth,magnesium,alloy,model,coupling,macro,finite,volume,method,FVM,cellular,automata,CA,proposed,this,paper,explore,CET,SLM,Taking,into,account,impact,recoil,pressure,Marangoni,convection,molten,pool,temperature,field,grain,structure,simulated,suggested,by,Zr,serving,heterogeneous,nucleation,sites,liquid,undercooled,layer,combined,action,forced,gradient,solute,concentration,leads,While,considering,dissolution,matrix,results,demon,strate,that,element,effective,significantly,inhibiting,growth,crystals,ensuring,sufficient,constitutional,supercooling,CS,required,addition,raise,preheating,contributes,enhancing,outcome,size,interdependence,IM,gradually,increasing,process,free,zone,NFZ,reduces,decreasing,diffusion,front,solid,interface,promote,undercooling,facilitate,development,qualitatively,verified,highly,consistent,through,experi,mentation
AB值：
0.549946
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