Microstructural Evolution and Mechanical Behavior of Thermally Aged Cast Duplex Stainless Steel
The microstructural evolution and mechanical behavior of cast duplex stainless steels (CDSSs) at 400 °C for different thermal aging times were investigated by transmission electron microscope (TEM) and small punch test (SPT). The results showed that the spinodal decomposition in ferrite was the main...
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| Format: | Article |
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MDPI AG
2020-12-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/24/5636 |
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| author | Zhenhua Li Ying Hu Tao Chen Xinyu Wang Pan Liu Yonghao Lu |
| author_facet | Zhenhua Li Ying Hu Tao Chen Xinyu Wang Pan Liu Yonghao Lu |
| author_sort | Zhenhua Li |
| collection | DOAJ |
| description | The microstructural evolution and mechanical behavior of cast duplex stainless steels (CDSSs) at 400 °C for different thermal aging times were investigated by transmission electron microscope (TEM) and small punch test (SPT). The results showed that the spinodal decomposition in ferrite was the main reason for the decrease in toughness, and G-phase did not play an important role in the embrittlement process. The change of membrane stretching zone (W<sub>m</sub>) played an important role in the SPT load-displacement curve before and after thermal aging. During the deformation process of W<sub>m</sub> in the SPT, for thermal aging for 10,000 h, some completely curved slip bands were generated inside the ferrite phase, which had no contact with the δ/γ phase interface and belonged to the slip bands produced by the independent deformation of ferrite. The combined effect of the curved slip bands and stress concentration led to the initiation of obvious micro-cracks at the δ/γ phase interface. The micro-cracks propagated along the ferrite phase curved slip bands, and eventually penetrated the entire hardened ferrite phase. |
| first_indexed | 2024-03-10T14:10:38Z |
| format | Article |
| id | doaj.art-4f3cff53ac1f4a96870e06aceb6251ca |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T14:10:38Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-4f3cff53ac1f4a96870e06aceb6251ca2023-11-21T00:10:27ZengMDPI AGMaterials1996-19442020-12-011324563610.3390/ma13245636Microstructural Evolution and Mechanical Behavior of Thermally Aged Cast Duplex Stainless SteelZhenhua Li0Ying Hu1Tao Chen2Xinyu Wang3Pan Liu4Yonghao Lu5State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment, China Nuclear Power Engineering Co., Ltd., Shenzhen 518172, ChinaNational Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment, China Nuclear Power Engineering Co., Ltd., Shenzhen 518172, ChinaNational Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment, China Nuclear Power Engineering Co., Ltd., Shenzhen 518172, ChinaNational Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, ChinaThe microstructural evolution and mechanical behavior of cast duplex stainless steels (CDSSs) at 400 °C for different thermal aging times were investigated by transmission electron microscope (TEM) and small punch test (SPT). The results showed that the spinodal decomposition in ferrite was the main reason for the decrease in toughness, and G-phase did not play an important role in the embrittlement process. The change of membrane stretching zone (W<sub>m</sub>) played an important role in the SPT load-displacement curve before and after thermal aging. During the deformation process of W<sub>m</sub> in the SPT, for thermal aging for 10,000 h, some completely curved slip bands were generated inside the ferrite phase, which had no contact with the δ/γ phase interface and belonged to the slip bands produced by the independent deformation of ferrite. The combined effect of the curved slip bands and stress concentration led to the initiation of obvious micro-cracks at the δ/γ phase interface. The micro-cracks propagated along the ferrite phase curved slip bands, and eventually penetrated the entire hardened ferrite phase.https://www.mdpi.com/1996-1944/13/24/5636thermal agingG-phasesmall punch testcast duplex stainless steelmechanical behavior |
| spellingShingle | Zhenhua Li Ying Hu Tao Chen Xinyu Wang Pan Liu Yonghao Lu Microstructural Evolution and Mechanical Behavior of Thermally Aged Cast Duplex Stainless Steel Materials thermal aging G-phase small punch test cast duplex stainless steel mechanical behavior |
| title | Microstructural Evolution and Mechanical Behavior of Thermally Aged Cast Duplex Stainless Steel |
| title_full | Microstructural Evolution and Mechanical Behavior of Thermally Aged Cast Duplex Stainless Steel |
| title_fullStr | Microstructural Evolution and Mechanical Behavior of Thermally Aged Cast Duplex Stainless Steel |
| title_full_unstemmed | Microstructural Evolution and Mechanical Behavior of Thermally Aged Cast Duplex Stainless Steel |
| title_short | Microstructural Evolution and Mechanical Behavior of Thermally Aged Cast Duplex Stainless Steel |
| title_sort | microstructural evolution and mechanical behavior of thermally aged cast duplex stainless steel |
| topic | thermal aging G-phase small punch test cast duplex stainless steel mechanical behavior |
| url | https://www.mdpi.com/1996-1944/13/24/5636 |
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