New Insights into Sulfide Inclusions in 1018 Carbon Steels
The role of heterogeneous phases in the localized corrosion of materials is an emerging area of research. This work addresses the detrimental role MnS inclusions play in the localized corrosion of carbon steels. We report the results of surface and bulk characterization of MnS inclusions in 1018 car...
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doaj-8cc2358e6d05405d8cd824bdf23fc1cc2021-03-06T00:08:23ZengMDPI AGMetals2075-47012021-03-011142842810.3390/met11030428New Insights into Sulfide Inclusions in 1018 Carbon SteelsNathaniel Rieders0Manjula Nandasiri1David Mogk2Recep Avci3Imaging and Chemical Analysis Laboratory, Physics Department, Montana State University, Bozeman, MT 59717-2220, USAArconic Technical Center, New Kensington, PA 15068, USAImaging and Chemical Analysis Laboratory, Physics Department, Montana State University, Bozeman, MT 59717-2220, USAImaging and Chemical Analysis Laboratory, Physics Department, Montana State University, Bozeman, MT 59717-2220, USAThe role of heterogeneous phases in the localized corrosion of materials is an emerging area of research. This work addresses the detrimental role MnS inclusions play in the localized corrosion of carbon steels. We report the results of surface and bulk characterization of MnS inclusions in 1018 carbon steel, using a high-resolution integrated Auger nanoprobe. It is shown that the surface morphology and composition of the inclusions are highly heterogeneous. MnS inclusions are found to be nonstoichiometric and to contain a highly O-enriched surface layer. Some inclusions are covered with a thin (approximately 5 nm) layer of Cu<sub>2</sub>S. The bulk composition of “MnS” inclusions is found to include 5–7% Fe and O, and these inclusions are believed to occupy Mn and S positions within the “MnS” lattice. Interfaces between “MnS” and host ferric grains are highly disordered. We hypothesize that pitting initiates and develops at these interfaces through a galvanic coupling between the strained and the unstrained ferrite grains.https://www.mdpi.com/2075-4701/11/3/428carbon steelinclusionMnSCu<sub>2</sub>SMnOAuger |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Nathaniel Rieders Manjula Nandasiri David Mogk Recep Avci |
spellingShingle |
Nathaniel Rieders Manjula Nandasiri David Mogk Recep Avci New Insights into Sulfide Inclusions in 1018 Carbon Steels Metals carbon steel inclusion MnS Cu<sub>2</sub>S MnO Auger |
author_facet |
Nathaniel Rieders Manjula Nandasiri David Mogk Recep Avci |
author_sort |
Nathaniel Rieders |
title |
New Insights into Sulfide Inclusions in 1018 Carbon Steels |
title_short |
New Insights into Sulfide Inclusions in 1018 Carbon Steels |
title_full |
New Insights into Sulfide Inclusions in 1018 Carbon Steels |
title_fullStr |
New Insights into Sulfide Inclusions in 1018 Carbon Steels |
title_full_unstemmed |
New Insights into Sulfide Inclusions in 1018 Carbon Steels |
title_sort |
new insights into sulfide inclusions in 1018 carbon steels |
publisher |
MDPI AG |
series |
Metals |
issn |
2075-4701 |
publishDate |
2021-03-01 |
description |
The role of heterogeneous phases in the localized corrosion of materials is an emerging area of research. This work addresses the detrimental role MnS inclusions play in the localized corrosion of carbon steels. We report the results of surface and bulk characterization of MnS inclusions in 1018 carbon steel, using a high-resolution integrated Auger nanoprobe. It is shown that the surface morphology and composition of the inclusions are highly heterogeneous. MnS inclusions are found to be nonstoichiometric and to contain a highly O-enriched surface layer. Some inclusions are covered with a thin (approximately 5 nm) layer of Cu<sub>2</sub>S. The bulk composition of “MnS” inclusions is found to include 5–7% Fe and O, and these inclusions are believed to occupy Mn and S positions within the “MnS” lattice. Interfaces between “MnS” and host ferric grains are highly disordered. We hypothesize that pitting initiates and develops at these interfaces through a galvanic coupling between the strained and the unstrained ferrite grains. |
topic |
carbon steel inclusion MnS Cu<sub>2</sub>S MnO Auger |
url |
https://www.mdpi.com/2075-4701/11/3/428 |
work_keys_str_mv |
AT nathanielrieders newinsightsintosulfideinclusionsin1018carbonsteels AT manjulanandasiri newinsightsintosulfideinclusionsin1018carbonsteels AT davidmogk newinsightsintosulfideinclusionsin1018carbonsteels AT recepavci newinsightsintosulfideinclusionsin1018carbonsteels |
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