|About this Abstract
||Materials Science & Technology 2019
||Additive Manufacturing of Metals: Microstructure and Material Properties of Nickel-based Alloys
||Parametric Study of Microstructure Formation of Quasi-Continuous-Wave Laser Additive Manufactured Inconel 718
||Zhaoyang Liu, Qiang Zhu, Lijun Song
|On-Site Speaker (Planned)
In this study , Inconel 718 thin-wall structure manufactured by laser powder deposition process was explored. The effects of process parameters including pulse frequency and laser scanning speed on the microstructure were studied. The results showed that laser scanning speed and pulse frequency comprehensively determined the grain morphology. Under the certain scanning speed, with the increase of pulse frequency, the grain morphology firstly tended to transform from columnar to fine equiaxed crystal, and then to coarse equiaxed crystal. For the fine equiaxed grain, optimized pulse time was about 1/3 solidification time of molten pool. The increase of laser scanning speed offset the effect of pulse frequency while strengthened the order of grain morphology. With high scanning speed, highly ordered columnar dendrites were established, and mono-crystalline texture was constructed. While with low scanning speed and optimized pulse frequency, fine equiaxed grain was obtained.
||Planned: At-meeting proceedings