Passivation and Chloride-Induced Depassivation of Additively Manufactured Duplex Stainless Steel Clads in Simulated Concrete Pore Solution: Fid-Bau Portal

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Passivation and Chloride-Induced Depassivation of Additively Manufactured Duplex Stainless Steel Clads in Simulated Concrete Pore Solution

Murkute, Pratik / Coldsnow, Kai / McAlexander, Melissa / Rada, Hunter M. / Pasebani, Somayeh / Isgor, O. Burkan

The metallurgical and electrochemical behavior of additively manufactured super duplex stainless steel (SDSS) clads on carbon steel [low-carbon steel (LCS)] substrates are investigated in a simulated concrete pore solution. The SDSS clads were manufactured using laser powder bed fusion (LPBF). Passivation and chloride-induced depassivation of the clads were studied as a function of LPBF parameters. It was shown that additively manufactured clads significantly improved the passivation characteristics and increased the chloride thresholds of the LCS substrate. The clads showed a decreasing $γ$ -austenite phase fraction and increasing $δ$ -ferrite phase fraction with increasing scan speeds. Increasing the $δ$ -ferrite phase fraction resulted in faster passive film formation but lower critical chloride thresholds for the clads. The clads produced with 100-, 600-, and $1,000 - mm / s$ laser scan speeds showed critical chloride thresholds of 4, 2.5, and 1.5 M, respectively. The as-cast SDSS alloy did not show any signs of depassivation until $5 M {Cl}^{-}$ concentration, whereas LCS substrates depassivated at $0.75 M {Cl}^{-}$ . The study proved the concept of additively manufactured carbon steel rebars with stainless steel clads and is a first step toward producing such rebars.

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Passivation and Chloride-Induced Depassivation of Additively Manufactured Duplex Stainless Steel Clads in Simulated Concrete Pore Solution

Murkute, Pratik / Coldsnow, Kai / McAlexander, Melissa / Rada, Hunter M. / Pasebani, Somayeh / Isgor, O. Burkan

The metallurgical and electrochemical behavior of additively manufactured super duplex stainless steel (SDSS) clads on carbon steel [low-carbon steel (LCS)] substrates are investigated in a simulated concrete pore solution. The SDSS clads were manufactured using laser powder bed fusion (LPBF). Passivation and chloride-induced depassivation of the clads were studied as a function of LPBF parameters. It was shown that additively manufactured clads significantly improved the passivation characteristics and increased the chloride thresholds of the LCS substrate. The clads showed a decreasing $γ$ -austenite phase fraction and increasing $δ$ -ferrite phase fraction with increasing scan speeds. Increasing the $δ$ -ferrite phase fraction resulted in faster passive film formation but lower critical chloride thresholds for the clads. The clads produced with 100-, 600-, and $1,000 - mm / s$ laser scan speeds showed critical chloride thresholds of 4, 2.5, and 1.5 M, respectively. The as-cast SDSS alloy did not show any signs of depassivation until $5 M {Cl}^{-}$ concentration, whereas LCS substrates depassivated at $0.75 M {Cl}^{-}$ . The study proved the concept of additively manufactured carbon steel rebars with stainless steel clads and is a first step toward producing such rebars.

Passivation and Chloride-Induced Depassivation of Additively Manufactured Duplex Stainless Steel Clads in Simulated Concrete Pore Solution

Murkute, Pratik / Coldsnow, Kai / McAlexander, Melissa / Rada, Hunter M. / Pasebani, Somayeh / Isgor, O. Burkan

The metallurgical and electrochemical behavior of additively manufactured super duplex stainless steel (SDSS) clads on carbon steel [low-carbon steel (LCS)] substrates are investigated in a simulated concrete pore solution. The SDSS clads were manufactured using laser powder bed fusion (LPBF). Passivation and chloride-induced depassivation of the clads were studied as a function of LPBF parameters. It was shown that additively manufactured clads significantly improved the passivation characteristics and increased the chloride thresholds of the LCS substrate. The clads showed a decreasing $γ$ -austenite phase fraction and increasing $δ$ -ferrite phase fraction with increasing scan speeds. Increasing the $δ$ -ferrite phase fraction resulted in faster passive film formation but lower critical chloride thresholds for the clads. The clads produced with 100-, 600-, and $1,000 - mm / s$ laser scan speeds showed critical chloride thresholds of 4, 2.5, and 1.5 M, respectively. The as-cast SDSS alloy did not show any signs of depassivation until $5 M {Cl}^{-}$ concentration, whereas LCS substrates depassivated at $0.75 M {Cl}^{-}$ . The study proved the concept of additively manufactured carbon steel rebars with stainless steel clads and is a first step toward producing such rebars.

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Title:

Passivation and Chloride-Induced Depassivation of Additively Manufactured Duplex Stainless Steel Clads in Simulated Concrete Pore Solution

Contributors:

Murkute, Pratik (author) / Coldsnow, Kai (author) / McAlexander, Melissa (author) / Rada, Hunter M. (author) / Pasebani, Somayeh (author) / Isgor, O. Burkan (author)

Published in:

Journal of Materials in Civil Engineering ; 33

Publication date:

2021-06-04

ISSN:

0899-1561 , 1943-5533

DOI:

https://doi.org/10.1061/(ASCE)MT.1943-5533.0003833

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

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