Microstructure and hardness response of novel 316L stainless steel composite with TiN addition fabricated by SLM

•Build quality improvement of selective laser melting by applying argon gas flow.•316L composite containing TiN nanoparticles prepared from microscale TiN powder.•Indirect prevention of TiN agglomeration by dissolution and re-precipitation. 316L stainless steel (316L) is commonly used in wide range...

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Bibliographic Details
Published in:Optics and laser technology 2020-09, Vol.129, p.106238, Article 106238
Main Authors: Tanprayoon, Dhritti, Srisawadi, Sasitorn, Sato, Yuji, Tsukamoto, Masahiro, Suga, Tetsuo
Format: Article
Language:English
Subjects:
Argon
Austenitic stainless steels
Corrosion resistance
Gas flow
Laser beam melting
Metal matrix composites
Microstructure
Nanoparticles
Particulate composites
Precipitation
Selective laser melting
Stainless steel
Titanium nitride
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Summary:•Build quality improvement of selective laser melting by applying argon gas flow.•316L composite containing TiN nanoparticles prepared from microscale TiN powder.•Indirect prevention of TiN agglomeration by dissolution and re-precipitation. 316L stainless steel (316L) is commonly used in wide range of applications because of its strength and corrosion resistance. An increase in its strength is possible when the steel is reinforced with titanium nitride (TiN) particles but there are some difficulties in the conventional fabrication processes that limit the extent of its use. Selective laser melting (SLM) is a well-known additive manufacturing process which shows a promising possibility to fabricate 316L/TiN components. In this work, a process feasibility and an effect of TiN addition were studied by fabricating the samples with different levels of TiN addition (0, 1, 5, and 10 wt%) and scan speed (30 and 50 mm/s). The process was conducted in an in-house developed SLM machine. The comparison between chamber atmospheric conditions were made – vacuum with and without argon gas flow. The sample build quality was improved by using argon gas flow. The TiN nanoparticles were observed within the molten layer despite the initial size of TiN powder about 1.5 µm. The results suggest the possibility of the fabrication of 316L/TiN composite the nanoscale TiN particles from microscale TiN powder.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2020.106238