摘要
Acritical issue in laserpowder bed fusion(LPBF)additivemanufacturing is the selective vaporization of alloying elements resulting in poor mechanical properties and corrosion resistance of parts.The process also alters the part’s chemical composition compared to the feedstock.Here we present a novel multi-physics modeling framework,integrating heat and fluid flow simulations,thermodynamic calculations,and evaporation modeling to estimate and control the composition change during LPBF of nickel-based superalloys.Experimental validation confirms the accuracy of our model.Moreover,we quantify the relative vulnerabilities of different nickel-based superalloys to composition change quantitatively and we examine the effect of remelting due to the layer-by-layer deposition during the LPBF process.Spatial variations in evaporative flux and compositions for each element were determined,providing valuable insights into the LPBF process and product attributes.The results of this study can be used to optimize theLPBF process parameters such as laserpower,scanning speed,and powder layer thickness to ensure the production of high-quality components with desired chemical compositions.
基金
funding support from Iowa State University
supported by the Next Generation TATARA Project sponsored by the Government of Japan and Shimane Prefecture which is acknowledged by Junji Shinjo
funding from the UKRI Innovation Fellowship funded by the Engineering and Physical Science Research Council(EPSRC),UK Research and Innovation,under the grant number:EP/S000828/2.
