Microstructure and Fracture Behavior of 316L Austenitic Stainless Steel Produced by Selective Laser Melting

Selective laser melting is an additive manufacturing method based on local melting of a metal powder bed by a high power laser beam. Fast laser scans are responsible for severe thermal gradients and high cooling rates which produce complex hydrodynamic fluid flow. These phenomena affect crystal grow...

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Bibliographic Details
Published inJournal of materials science & technology Vol. 32; no. 8; pp. 738 - 744
Main Authors Casati, R., Lemke, J., Vedani, M.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.08.2016
Subjects
316L奥氏体不锈钢
Additive manufacturing
AISI 316L
Fracture behavior
Microstructural analysis
Selective laser melting
微观结构
微观缺陷
断裂行为
流体动力学
激光熔化
粉末颗粒
高功率激光束
AISI 316L
Additive manufacturing
Selective laser melting
Fracture behavior
Microstructural analysis
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Summary:Selective laser melting is an additive manufacturing method based on local melting of a metal powder bed by a high power laser beam. Fast laser scans are responsible for severe thermal gradients and high cooling rates which produce complex hydrodynamic fluid flow. These phenomena affect crystal growth and orientation and are believed to be the cause of material spattering and microstructural defects, e.g. pores and incompletely melted particles. In this work, the microstructure and texture of 316L bars built along two different orientations and the effect of different distribution of defects on their mechanical response and failure mechanisms were investigated. Partially molten powder particles are believed to be responsible for the scattering in elongation to failure, reduced strength, and premature failure of vertical samples.
Bibliography:21-1315/TG
AISI 316L Additive manufacturing Selective laser melting Microstructural analysis Fracture behavior
Selective laser melting is an additive manufacturing method based on local melting of a metal powder bed by a high power laser beam. Fast laser scans are responsible for severe thermal gradients and high cooling rates which produce complex hydrodynamic fluid flow. These phenomena affect crystal growth and orientation and are believed to be the cause of material spattering and microstructural defects, e.g. pores and incompletely melted particles. In this work, the microstructure and texture of 316L bars built along two different orientations and the effect of different distribution of defects on their mechanical response and failure mechanisms were investigated. Partially molten powder particles are believed to be responsible for the scattering in elongation to failure, reduced strength, and premature failure of vertical samples.
ISSN:1005-0302
1941-1162
DOI:10.1016/j.jmst.2016.06.016