Effect of Organizational Evolution on the Stress Corrosion Cracking of the Cr-Co-Ni-Mo Series of Ultra-High Strength Stainless Steel
Different microstructures were obtained under various thermal conditions by adjusting the heat treatment parameters of the Cr-Co-Ni-Mo series of ultra-high strength stainless steel. The effect of organizational evolution on the stress corrosion cracking (SCC) of the Cr-Co-Ni-Mo series of ultra-high...
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MDPI AG
2022-01-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/2/497 |
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| author | Shuai Tian Zhenbao Liu Renli Fu Chaofang Dong Xiaohui Wang |
| author_facet | Shuai Tian Zhenbao Liu Renli Fu Chaofang Dong Xiaohui Wang |
| author_sort | Shuai Tian |
| collection | DOAJ |
| description | Different microstructures were obtained under various thermal conditions by adjusting the heat treatment parameters of the Cr-Co-Ni-Mo series of ultra-high strength stainless steel. The effect of organizational evolution on the stress corrosion cracking (SCC) of the Cr-Co-Ni-Mo series of ultra-high strength stainless steel was investigated using potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and other test methods in combination with slow strain rate tensile tests (SSRTs). The results show that the Mo- and Cr-rich clusters and precipitation of the Laves phase reduce the corrosion resistance, while increasing the austenite content can improve the corrosion resistance. The Cr-Co-Ni-Mo series of ultra-high strength stainless steel has a high SCC resistance after quenching at 1080 °C and undergoing deep cooling (DC) treatment at −73 °C. With increasing holding time, the strength of the underaged and peak-aged specimens increases, but the passivation and SCC resistance decreases. At the overaged temperature, the specimen has good SCC resistance after a short holding time, which is attributed to its higher austenite content and lower dislocation density. As a stable hydrogen trap in steel, austenite effectively improves the SCC resistance of steel. However, under the coupled action of hydrogen and stress, martensitic transformation occurs due to the decrease in the lamination energy of austenite, and the weak martensitic interface becomes the preferred location for crack initiation and propagation. |
| first_indexed | 2024-03-10T01:03:47Z |
| format | Article |
| id | doaj.art-b238effa73ce4e0fb67253f49a144894 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T01:03:47Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-b238effa73ce4e0fb67253f49a1448942023-11-23T14:30:05ZengMDPI AGMaterials1996-19442022-01-0115249710.3390/ma15020497Effect of Organizational Evolution on the Stress Corrosion Cracking of the Cr-Co-Ni-Mo Series of Ultra-High Strength Stainless SteelShuai Tian0Zhenbao Liu1Renli Fu2Chaofang Dong3Xiaohui Wang4College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaInstitute for Special Steel Institute, Central Iron and Steel Research Institute, Beijing 100081, ChinaCollege of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaCorrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute for Special Steel Institute, Central Iron and Steel Research Institute, Beijing 100081, ChinaDifferent microstructures were obtained under various thermal conditions by adjusting the heat treatment parameters of the Cr-Co-Ni-Mo series of ultra-high strength stainless steel. The effect of organizational evolution on the stress corrosion cracking (SCC) of the Cr-Co-Ni-Mo series of ultra-high strength stainless steel was investigated using potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and other test methods in combination with slow strain rate tensile tests (SSRTs). The results show that the Mo- and Cr-rich clusters and precipitation of the Laves phase reduce the corrosion resistance, while increasing the austenite content can improve the corrosion resistance. The Cr-Co-Ni-Mo series of ultra-high strength stainless steel has a high SCC resistance after quenching at 1080 °C and undergoing deep cooling (DC) treatment at −73 °C. With increasing holding time, the strength of the underaged and peak-aged specimens increases, but the passivation and SCC resistance decreases. At the overaged temperature, the specimen has good SCC resistance after a short holding time, which is attributed to its higher austenite content and lower dislocation density. As a stable hydrogen trap in steel, austenite effectively improves the SCC resistance of steel. However, under the coupled action of hydrogen and stress, martensitic transformation occurs due to the decrease in the lamination energy of austenite, and the weak martensitic interface becomes the preferred location for crack initiation and propagation.https://www.mdpi.com/1996-1944/15/2/497ultra-high strength stainless steelSCClaves phaseaustenite |
| spellingShingle | Shuai Tian Zhenbao Liu Renli Fu Chaofang Dong Xiaohui Wang Effect of Organizational Evolution on the Stress Corrosion Cracking of the Cr-Co-Ni-Mo Series of Ultra-High Strength Stainless Steel Materials ultra-high strength stainless steel SCC laves phase austenite |
| title | Effect of Organizational Evolution on the Stress Corrosion Cracking of the Cr-Co-Ni-Mo Series of Ultra-High Strength Stainless Steel |
| title_full | Effect of Organizational Evolution on the Stress Corrosion Cracking of the Cr-Co-Ni-Mo Series of Ultra-High Strength Stainless Steel |
| title_fullStr | Effect of Organizational Evolution on the Stress Corrosion Cracking of the Cr-Co-Ni-Mo Series of Ultra-High Strength Stainless Steel |
| title_full_unstemmed | Effect of Organizational Evolution on the Stress Corrosion Cracking of the Cr-Co-Ni-Mo Series of Ultra-High Strength Stainless Steel |
| title_short | Effect of Organizational Evolution on the Stress Corrosion Cracking of the Cr-Co-Ni-Mo Series of Ultra-High Strength Stainless Steel |
| title_sort | effect of organizational evolution on the stress corrosion cracking of the cr co ni mo series of ultra high strength stainless steel |
| topic | ultra-high strength stainless steel SCC laves phase austenite |
| url | https://www.mdpi.com/1996-1944/15/2/497 |
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