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The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600

To suppress stress corrosion-cracking, compressive residual stresses, such as shot peening, laser peening, water jet peening, ultrasonic peening, and ultrasonic nanocrystal surface modification (UNSM) are utilized. However, among the numerous techniques, there is little research about the corrosion...

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Autores principales: Kim, Ki Tae, Kim, Young Sik
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6804240/
https://www.ncbi.nlm.nih.gov/pubmed/31569676
http://dx.doi.org/10.3390/ma12193165
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author Kim, Ki Tae
Kim, Young Sik
author_facet Kim, Ki Tae
Kim, Young Sik
author_sort Kim, Ki Tae
collection PubMed
description To suppress stress corrosion-cracking, compressive residual stresses, such as shot peening, laser peening, water jet peening, ultrasonic peening, and ultrasonic nanocrystal surface modification (UNSM) are utilized. However, among the numerous techniques, there is little research about the corrosion effect of detailed conditions, such as static load or amplitude in UNSM. A study on UNSM among various techniques of adding compressive residual stress to Alloy 600 was conducted. The focus of this study was on the effect of the static load in UNSM on the corrosion properties of Alloy 600. Microstructure analysis was conducted using an optical microscope (OM), a scanning electron microscope (SEM), and electron backscattering diffraction (EBSD), while compressive residual stress was measured using a nano-indentation technique. A cyclic polarization test and the AC (Alternating Current)-impedance measurement were both used to analyze the corrosion properties. An increase in static load under critical static load enhanced the grain boundary diffusion, consequently strengthened the passive film, and facilitated the surface diffusion, thereby improving the passivation of Alloy 600. However, higher static loads over the critical value can lead to an increase in the friction between the striking tip and the surface, thereby creating an overlapped wave, which reduces the corrosion properties.
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spelling pubmed-68042402019-11-18 The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600 Kim, Ki Tae Kim, Young Sik Materials (Basel) Article To suppress stress corrosion-cracking, compressive residual stresses, such as shot peening, laser peening, water jet peening, ultrasonic peening, and ultrasonic nanocrystal surface modification (UNSM) are utilized. However, among the numerous techniques, there is little research about the corrosion effect of detailed conditions, such as static load or amplitude in UNSM. A study on UNSM among various techniques of adding compressive residual stress to Alloy 600 was conducted. The focus of this study was on the effect of the static load in UNSM on the corrosion properties of Alloy 600. Microstructure analysis was conducted using an optical microscope (OM), a scanning electron microscope (SEM), and electron backscattering diffraction (EBSD), while compressive residual stress was measured using a nano-indentation technique. A cyclic polarization test and the AC (Alternating Current)-impedance measurement were both used to analyze the corrosion properties. An increase in static load under critical static load enhanced the grain boundary diffusion, consequently strengthened the passive film, and facilitated the surface diffusion, thereby improving the passivation of Alloy 600. However, higher static loads over the critical value can lead to an increase in the friction between the striking tip and the surface, thereby creating an overlapped wave, which reduces the corrosion properties. MDPI 2019-09-27 /pmc/articles/PMC6804240/ /pubmed/31569676 http://dx.doi.org/10.3390/ma12193165 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Kim, Ki Tae
Kim, Young Sik
The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600
title The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600
title_full The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600
title_fullStr The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600
title_full_unstemmed The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600
title_short The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600
title_sort effect of the static load in the unsm process on the corrosion properties of alloy 600
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6804240/
https://www.ncbi.nlm.nih.gov/pubmed/31569676
http://dx.doi.org/10.3390/ma12193165
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