Enhancement of Corrosion Properties of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) Austenitic Stainless Steels by Carbon Alloying
In this study, the resistance to pitting corrosion of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) austenitic stainless steel γ-SSs (in wt%) with different C/(C + N) ratios (0.02, 0.29, and 0.60) was evaluated. It was found to be difficult to form a γ-matrix without precipitation, because the Cr<sub>23</su...
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MDPI AG
2021-07-01
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| Online Access: | https://www.mdpi.com/2075-4701/11/7/1124 |
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| author | Daun Byeon Heon-Young Ha Sung-Dae Kim Hyo-Haeng Jo JinJong Lee Jae Hoon Jang Tae-Ho Lee Jong-Ho Shin Namhyun Kang |
| author_facet | Daun Byeon Heon-Young Ha Sung-Dae Kim Hyo-Haeng Jo JinJong Lee Jae Hoon Jang Tae-Ho Lee Jong-Ho Shin Namhyun Kang |
| author_sort | Daun Byeon |
| collection | DOAJ |
| description | In this study, the resistance to pitting corrosion of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) austenitic stainless steel γ-SSs (in wt%) with different C/(C + N) ratios (0.02, 0.29, and 0.60) was evaluated. It was found to be difficult to form a γ-matrix without precipitation, because the Cr<sub>23</sub>C<sub>6</sub> precipitation rate in the γ-SSs with the C/(C + N) value of 0.60 was too fast. Thus, it was recommended to maintain the C/(C + N) ratio below 0.6 in Fe-18Cr-9Mn-5.5Ni-0.3(C + N) γ-SSs. As a result of the potentiodynamic polarization tests, the γ-SS with a C/(C + N) ratio of 0.29 showed the highest resistance to pitting corrosion, and the resistance level of this alloy was superior to that of the AISI 304 γ-SS. Analysis of the passive film and matrix dissolution rates revealed that a higher C/(C + N) ratio of γ-SS increased the protective ability of the passive film and decreased the growth rate of the pits. Therefore, it could be concluded that partial substitution of C for N was advantageous for improving the pitting corrosion resistance of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) γ-SSs, as long as C and N existed in a solid solution state. |
| first_indexed | 2024-03-10T09:32:45Z |
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| language | English |
| last_indexed | 2024-03-10T09:32:45Z |
| publishDate | 2021-07-01 |
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| spelling | doaj.art-c885e4fe281d4a0ebe5fab4434898ea82023-11-22T04:24:10ZengMDPI AGMetals2075-47012021-07-01117112410.3390/met11071124Enhancement of Corrosion Properties of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) Austenitic Stainless Steels by Carbon AlloyingDaun Byeon0Heon-Young Ha1Sung-Dae Kim2Hyo-Haeng Jo3JinJong Lee4Jae Hoon Jang5Tae-Ho Lee6Jong-Ho Shin7Namhyun Kang8Department of Materials Science and Engineering, Pusan National University, Busan 46241, KoreaAdvanced Metals Division, Korea Institute of Materials Science, Changwon 51508, KoreaAdvanced Metals Division, Korea Institute of Materials Science, Changwon 51508, KoreaAdvanced Metals Division, Korea Institute of Materials Science, Changwon 51508, KoreaAdvanced Metals Division, Korea Institute of Materials Science, Changwon 51508, KoreaAdvanced Metals Division, Korea Institute of Materials Science, Changwon 51508, KoreaAdvanced Metals Division, Korea Institute of Materials Science, Changwon 51508, KoreaMaterials Technology Development Team, Corporate Research and Development Institute, Doosan Heavy Industries and Construction Co. Ltd., Changwon 51711, KoreaDepartment of Materials Science and Engineering, Pusan National University, Busan 46241, KoreaIn this study, the resistance to pitting corrosion of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) austenitic stainless steel γ-SSs (in wt%) with different C/(C + N) ratios (0.02, 0.29, and 0.60) was evaluated. It was found to be difficult to form a γ-matrix without precipitation, because the Cr<sub>23</sub>C<sub>6</sub> precipitation rate in the γ-SSs with the C/(C + N) value of 0.60 was too fast. Thus, it was recommended to maintain the C/(C + N) ratio below 0.6 in Fe-18Cr-9Mn-5.5Ni-0.3(C + N) γ-SSs. As a result of the potentiodynamic polarization tests, the γ-SS with a C/(C + N) ratio of 0.29 showed the highest resistance to pitting corrosion, and the resistance level of this alloy was superior to that of the AISI 304 γ-SS. Analysis of the passive film and matrix dissolution rates revealed that a higher C/(C + N) ratio of γ-SS increased the protective ability of the passive film and decreased the growth rate of the pits. Therefore, it could be concluded that partial substitution of C for N was advantageous for improving the pitting corrosion resistance of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) γ-SSs, as long as C and N existed in a solid solution state.https://www.mdpi.com/2075-4701/11/7/1124lean austenite stainless steelcarbonnitrogenpitting corrosionpassive film |
| spellingShingle | Daun Byeon Heon-Young Ha Sung-Dae Kim Hyo-Haeng Jo JinJong Lee Jae Hoon Jang Tae-Ho Lee Jong-Ho Shin Namhyun Kang Enhancement of Corrosion Properties of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) Austenitic Stainless Steels by Carbon Alloying Metals lean austenite stainless steel carbon nitrogen pitting corrosion passive film |
| title | Enhancement of Corrosion Properties of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) Austenitic Stainless Steels by Carbon Alloying |
| title_full | Enhancement of Corrosion Properties of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) Austenitic Stainless Steels by Carbon Alloying |
| title_fullStr | Enhancement of Corrosion Properties of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) Austenitic Stainless Steels by Carbon Alloying |
| title_full_unstemmed | Enhancement of Corrosion Properties of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) Austenitic Stainless Steels by Carbon Alloying |
| title_short | Enhancement of Corrosion Properties of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) Austenitic Stainless Steels by Carbon Alloying |
| title_sort | enhancement of corrosion properties of fe 18cr 9mn 5 5ni 0 3 c n austenitic stainless steels by carbon alloying |
| topic | lean austenite stainless steel carbon nitrogen pitting corrosion passive film |
| url | https://www.mdpi.com/2075-4701/11/7/1124 |
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