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Band-Like Distribution of Grains in Selective Laser Melting Track Under Keyhole Mode

  • Yafei Wang
  • Leilei Xing
  • Kailun Li
  • Chenfan Yu
  • Jing Ma
  • Wei LiuEmail author
  • Zhijian ShenEmail author
Article
  • 38 Downloads

Abstract

Grain structure in the melt pool under keyhole mode is complex due to complicated solidified conditions, especially in consideration of the intense fluid flow. This paper aims to clarify grain structure and grain growth mechanism in melt pool under keyhole mode in selective laser melting. The microstructure from transverse cross section and longitudinal cross section near the centerline of 316L single tracks was characterized. In the longitudinal cross section, band-like grain structure formed. It is found that fluid flow can refine the grains, and large columnar grains grow towards crystallographic 〈110〉 direction.

Notes

Acknowledgments

This research was funded by the National Magnetic Confinement Fusion Science Program of China under Grant 2014GB117000 and the Joint Funds of the National Natural Science Foundation of China under Grant U1605243.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  1. 1.School of Materials Science and EngineeringTsinghua UniversityBeijingP.R. China
  2. 2.Department of Materials and Environment Chemistry, Arrhenius LaboratoryStockholm UniversityStockholmSweden

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