Investigation of consolidation kinetics and microstructure evolution of Al alloys in direct metal laser sintering using phase field simulation

7th National Conference on Processing and Characterization of Materials

Satpathy, Bubloom Bimal^1 ; Nandy, Jyotirmoy^1 ; Sahoo, Seshadev^1

Department of Mechanical Engineering, Institute of Technical Education and Research, Odisha, Bhubaneswar

751030, India^1

关键词: Densification behavior;    Direct metal laser sintering;    Grain-boundary diffusion;    Mechanical and physical properties;    Micro-structure evolutions;    Phase-field simulation;    Physical and mechanical properties;    Polycrystalline structure;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/338/1/012045/pdf
DOI  :  10.1088/1757-899X/338/1/012045

来源: IOP

【 摘 要 】

Direct metal laser sintering is one of the very efficient processes which comes under the field of additive manufacturing and is capable of producing products of good mechanical and physical properties. The process parameters affect the physical and mechanical properties of the final products. Rapid solidification plays an important role in the consolidation kinetics as the powdered material sinters and forms a polycrystalline structure. In the recent times, the enormous use of computational modeling has helped in examining the utility of final products in a wide range of applications. In this study, a phase field model has been implemented to foresee the consolidation kinetics during the liquid state sintering. Temperature profiles have been used to study the densification behavior and neck growth which is caused by the surface diffusion of particles at initial stage. Later, importance of grain boundary and the volume diffusion during densification process is analyzed. It is also found that with rise in temperature, neck growth also increases rapidly due to the interaction of adjacent grains through grain boundary diffusion and stabilization of grain growth.