Open AccessThe mechanism of substructure formation and grain growth 316L stainless steel by selective laser melting
Author(s) -
Dengcui Yang,
Yuchen Yin,
Xinfeng Kan,
Yue Zhao,
Zhengzhi Zhao,
Jiquan Sun
Publication year - 2021
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/ac21ea
Subject(s) - substructure , materials science , temperature gradient , selective laser melting , plane (geometry) , fusion , composite material , grain growth , epitaxy , metallurgy , layer (electronics) , crystallography , geometry , microstructure , structural engineering , chemistry , linguistics , physics , mathematics , philosophy , quantum mechanics , engineering
This paper aims to investigate the unique substructure and grain growth of 316L stainless steel processed by selective laser melting (SLM) and clarify the mechanism. Results showed that the grain orientation on the x-z plane parallel to the build direction was the same type as the y-z plane, which all grow along the heat flow direction to form elongated columnar grains passing through the multi-layer fusion line. The epitaxial growth direction of grains changed abruptly with the vary of temperature gradient direction. Moreover, to expound the substructure formation based on solidification theory, a finite element model was established to obtain the distribution map of cooling rate G × R and solidified morphology G/R.