Columnar grain width control for SS316L via hatch spacing manipulation in laser powder bed fusion
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AbstractThis study provides a quantitative way to tailor the grain structure in laser powder bed fusion (LPBF). Square-bottomed columnar grains (SCGs) were developed with a certain width roughly equal to the hatch spacing. The development of SCGs relied on different distinguishable regions, which were identified based on the differences in microstructural features between the melt-pool side and centreline. High lattice rotation accumulated at the melt-pool centreline, leading to grain boundaries forming at the centreline regions. The ultrasonic attenuation measurements and microhardness tests
further validated the controllable properties. The findings indicated a novel approach to customise the material property.
All Author(s) ListZhiheng Hu, Shubo Gao, Junfei Tai, Shuo Qu, Junhao Ding, Xu Song, Zheng Fan
Journal nameMaterials Research Letters
Volume Number11
Issue Number3
Pages231 - 238
LanguagesEnglish-United States

Last updated on 2024-16-04 at 00:31