Composition Optimum Design and Strengthening and Toughening Mechanisms of New Alumina-Forming Austenitic Heat-Resistant Steels
In order to promote the development of ultra-supercritical technology, the optimum composition design of three new alumina-forming austenitic heat-resistant steels, based on Fe−22Cr−25Ni (wt. %), with low cost and excellent performance, and used for 700 °C ultra-supercri...
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MDPI AG
2019-08-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/9/9/921 |
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| author | Nan Dong Ruirui Jia Jian Wang Guangwei Fan Xudong Fang Peide Han |
| author_facet | Nan Dong Ruirui Jia Jian Wang Guangwei Fan Xudong Fang Peide Han |
| author_sort | Nan Dong |
| collection | DOAJ |
| description | In order to promote the development of ultra-supercritical technology, the optimum composition design of three new alumina-forming austenitic heat-resistant steels, based on Fe−22Cr−25Ni (wt. %), with low cost and excellent performance, and used for 700 °C ultra-supercritical unit was carried out using Thermo-Calc software. A comparison of the mechanical properties presented that with increasing Al content, the plasticity of the system was further improved. Based on the composition system, a systematic investigation regarding the structure stability, thermodynamic properties, and mechanical properties of these new steels was carried out to reveal possible strengthening and toughening mechanisms by employing the first-principles method. Calculation results showed that when Al existed in the Fe−Cr−Ni alloy system as a solid solution, the new structures were stable, especially under high temperature. The solution of Al and Al + Si could increase the value of B/G, namely improving the plasticity of the system, particularly in case of alloying with Al + Si. The inclusion of Si in the Fe−Cr−Ni−Al system was conducive to further improving the plasticity without affecting the strength, which provided references for the subsequent optimum composition design and performance regulation of alumina-forming austenitic heat-resistant steels. |
| first_indexed | 2024-12-14T13:22:20Z |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-14T13:22:20Z |
| publishDate | 2019-08-01 |
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| spelling | doaj.art-21413ba8f1f24c7894fff1113dd607a92022-12-21T22:59:54ZengMDPI AGMetals2075-47012019-08-019992110.3390/met9090921met9090921Composition Optimum Design and Strengthening and Toughening Mechanisms of New Alumina-Forming Austenitic Heat-Resistant SteelsNan Dong0Ruirui Jia1Jian Wang2Guangwei Fan3Xudong Fang4Peide Han5College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaTechnology Center, Taiyuan Iron and Steel (Group) Co., Ltd., Taiyuan 030003, ChinaTechnology Center, Taiyuan Iron and Steel (Group) Co., Ltd., Taiyuan 030003, ChinaCollege of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaIn order to promote the development of ultra-supercritical technology, the optimum composition design of three new alumina-forming austenitic heat-resistant steels, based on Fe−22Cr−25Ni (wt. %), with low cost and excellent performance, and used for 700 °C ultra-supercritical unit was carried out using Thermo-Calc software. A comparison of the mechanical properties presented that with increasing Al content, the plasticity of the system was further improved. Based on the composition system, a systematic investigation regarding the structure stability, thermodynamic properties, and mechanical properties of these new steels was carried out to reveal possible strengthening and toughening mechanisms by employing the first-principles method. Calculation results showed that when Al existed in the Fe−Cr−Ni alloy system as a solid solution, the new structures were stable, especially under high temperature. The solution of Al and Al + Si could increase the value of B/G, namely improving the plasticity of the system, particularly in case of alloying with Al + Si. The inclusion of Si in the Fe−Cr−Ni−Al system was conducive to further improving the plasticity without affecting the strength, which provided references for the subsequent optimum composition design and performance regulation of alumina-forming austenitic heat-resistant steels.https://www.mdpi.com/2075-4701/9/9/921alumina-forming austenitic heat-resistant steelsoptimum designFirst-principlesmechanical propertiesalloy elements |
| spellingShingle | Nan Dong Ruirui Jia Jian Wang Guangwei Fan Xudong Fang Peide Han Composition Optimum Design and Strengthening and Toughening Mechanisms of New Alumina-Forming Austenitic Heat-Resistant Steels Metals alumina-forming austenitic heat-resistant steels optimum design First-principles mechanical properties alloy elements |
| title | Composition Optimum Design and Strengthening and Toughening Mechanisms of New Alumina-Forming Austenitic Heat-Resistant Steels |
| title_full | Composition Optimum Design and Strengthening and Toughening Mechanisms of New Alumina-Forming Austenitic Heat-Resistant Steels |
| title_fullStr | Composition Optimum Design and Strengthening and Toughening Mechanisms of New Alumina-Forming Austenitic Heat-Resistant Steels |
| title_full_unstemmed | Composition Optimum Design and Strengthening and Toughening Mechanisms of New Alumina-Forming Austenitic Heat-Resistant Steels |
| title_short | Composition Optimum Design and Strengthening and Toughening Mechanisms of New Alumina-Forming Austenitic Heat-Resistant Steels |
| title_sort | composition optimum design and strengthening and toughening mechanisms of new alumina forming austenitic heat resistant steels |
| topic | alumina-forming austenitic heat-resistant steels optimum design First-principles mechanical properties alloy elements |
| url | https://www.mdpi.com/2075-4701/9/9/921 |
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