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Enhancement of Corrosion Properties of Fe-18Cr-9Mn-5.5Ni-0.3(C + N) Austenitic Stainless Steels by Carbon Alloying
| Content Provider | MDPI |
|---|---|
| Author | Byeon, Daun Ha, Heon-Young Kim, Sung-Dae Jo, Hyo-Haeng Lee, Jinjong Jang, Jae Lee, Tae-Ho Shin, Jong-Ho Kang, Namhyun |
| Copyright Year | 2021 |
| 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 $Cr_{23}C_{6}$ 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. |
| Starting Page | 1124 |
| e-ISSN | 20754701 |
| DOI | 10.3390/met11071124 |
| Journal | Metals |
| Issue Number | 7 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-07-15 |
| Access Restriction | Open |
| Subject Keyword | Metals Metallurgy and Metallurgical Engineering Lean Austenite Stainless Steel Carbon Nitrogen Pitting Corrosion Passive Film |
| Content Type | Text |
| Resource Type | Article |
