Heat treatment effect on the microstructure and corrosion behavior of 316L stainless steel fabricated by selective laser melting for proton exchange membrane fuel cells

Microstructure and corrosion behavior of 316L stainless steel fabricated by selective laser melting (SLM) for bipolar plate were investigated and the subsequent heat treatment effect was also clarified. Results showed that sub-grains widely existed in the SLM 316L and the dislocations in the grain b...

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Bibliographic Details
Published in:Electrochimica acta 2018-06, Vol.276, p.293-303
Main Authors: Kong, Decheng, Ni, Xiaoqing, Dong, Chaofang, Zhang, Liang, Man, Cheng, Yao, Jizheng, Xiao, Kui, Li, Xiaogang
Format: Article
Language:English
Subjects:
316L stainless steel
Austenitic stainless steels
Bipolar plate
Chromium oxides
Corrosion behavior
Corrosion effects
Corrosion resistance
Corrosion resistant steels
Crystal defects
Defect annealing
Dislocations
Electrodes
Grain boundaries
Heat exchange
Heat treating
Heat treatment
Laser beam melting
Microstructure
Plates (structural members)
Proton exchange membrane fuel cells
Recrystallization
Selective laser melting
Stainless steel
Sulfuric acid
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Summary:Microstructure and corrosion behavior of 316L stainless steel fabricated by selective laser melting (SLM) for bipolar plate were investigated and the subsequent heat treatment effect was also clarified. Results showed that sub-grains widely existed in the SLM 316L and the dislocations in the grain boundary migrated and disappeared after heat treatment. The as produced SLM 316L exhibited inferior corrosion resistance than the wrought in 0.5 M H2SO4 solution with 50 ppm Cl− and 2 ppm F− ions at 70 °C due to the SLM defects (molten pool boundaries, non-equilibrium phases etc.), and short, stress relief annealing did not homogenize the non-uniform structures. However, recrystallization heat treatment can improve the durability due to the more uniform structure and thicker passive film. Meanwhile, the proportion of the oxides in passive film formed on SLM 316L increased after heat treatment, especially for the chromic oxide, leading to a better anti-corrosive property. [Display omitted] •316L stainless steel was prepared by selective laser melting (SLM) with optimized parameters.•As produced SLM 316L exhibited inferior corrosion resistance than the wrought in PEMFCs at 70 °C.•Recrystallization heat treatment could improve the durability due to the homogenized structure and thicker passive film.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2018.04.188