Selective Laser Melting Technology Simulation

Selective Laser Melting(SLM)plays an important role in Rapid Prototyping and Manufacturing(RPM)which is make use of pure metal or alloy powder to create sophisticated apparatus manufacturing method efficiently and precisely.Because of the high temperature gradient and complexity of the heat transfer process,it is difficult to invest temperature-stress distribution directly by experiment and require mount of both material and financial resources and m manual labour.It is necessary to resort numerical simulation study its many affecting factors and its interaction relationship.Numerical simulation is applied to study correlationship beteewn manufacturing parameters,material properties,environmental factors and temperature-stress distributing disciplinarian of SLM processing providing a powerful theoretical basis for experimental economized scientific research capitalized cost as well.In this paper,Ti6Al4V alloy powder was utilized to research the temperature and stress characteristics from powder to solid machining process and analized temperature-stress distribution in three-dimensional,discussed influence factors such as linear energy density,laser scanning path spacing,scanning speed,substrate material property.Direrent distribution laws is explored concerning internal temperature-stress with times increased,maximum and minimum temperature at melting channel with diversity laser power vilocity and various scanning longth.Results shows that the advantage of numerical simulation presented by temperature-stress distribution changes clearly in the three-dimensional direction in SLM scanning process.Increament of scan length in a certain range is beneficial to reduce temperature gradient and maximum stress that contributing to stress concentration.Finally,the zenith of temperature-stress distribution at melting seam and volume of the molten pool increased with the energy density climb.The results of this paper will purveys engineering experiments in theoretical and practical guidance significantly.