Effect of Ce on creep damage behaviors of 316LN austenitic stainless steel at 650 °C/225 MPa
The influence of trace Ce addition on the creep damage behavior of 316LN austenitic stainless steel (316LN) under 650 °C/225 MPa was investigated through microstructural characterization and first-principles calculations, and the underlying mechanism was elucidated. The results show that the additio...
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Elsevier
2025-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425007768 |
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| author | Chongqing Tan Xiaoqiang Hu Renxian Yang Dianzhong Li |
| author_facet | Chongqing Tan Xiaoqiang Hu Renxian Yang Dianzhong Li |
| author_sort | Chongqing Tan |
| collection | DOAJ |
| description | The influence of trace Ce addition on the creep damage behavior of 316LN austenitic stainless steel (316LN) under 650 °C/225 MPa was investigated through microstructural characterization and first-principles calculations, and the underlying mechanism was elucidated. The results show that the addition of 0.011 wt% Ce extends the creep rupture life of 316LN steel from 175h to 253h but significantly reduces the creep rupture strain from 62 % to 25 % and shifts the fracture mode from trans-granular to intergranular failure. The formation of intergranular cracks is closely related to the nucleation and growth behavior of cavities in the vicinity of dispersed Cr-containing M23C6 carbides. First-principles calculations reveal that the solute Ce atoms distribute along grain boundaries (GBs) independently of Cr-rich carbides, inhibiting GB migration and enhancing creep resistance. However, Ce segregation reduces the cohesive strength of GBs, making transverse GB regions with Ce segregation more susceptible to decohesion under high stress, leading to cavity nucleation. Continuous cavity nucleation weakens GB tensile strength, while interfacial cracking of the chromium carbides promotes cavity coalescence, forming intergranular microcracks. The propagation of these microcracks ultimately induces intergranular fracture and reduces creep plasticity. |
| format | Article |
| id | doaj-art-bf11318511124871abfaefc228bd5fd2 |
| institution | DOAJ |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-bf11318511124871abfaefc228bd5fd22025-08-20T03:16:46ZengElsevierJournal of Materials Research and Technology2238-78542025-05-01362169217710.1016/j.jmrt.2025.03.266Effect of Ce on creep damage behaviors of 316LN austenitic stainless steel at 650 °C/225 MPaChongqing Tan0Xiaoqiang Hu1Renxian Yang2Dianzhong Li3Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China; Corresponding author. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China; School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, ChinaThe influence of trace Ce addition on the creep damage behavior of 316LN austenitic stainless steel (316LN) under 650 °C/225 MPa was investigated through microstructural characterization and first-principles calculations, and the underlying mechanism was elucidated. The results show that the addition of 0.011 wt% Ce extends the creep rupture life of 316LN steel from 175h to 253h but significantly reduces the creep rupture strain from 62 % to 25 % and shifts the fracture mode from trans-granular to intergranular failure. The formation of intergranular cracks is closely related to the nucleation and growth behavior of cavities in the vicinity of dispersed Cr-containing M23C6 carbides. First-principles calculations reveal that the solute Ce atoms distribute along grain boundaries (GBs) independently of Cr-rich carbides, inhibiting GB migration and enhancing creep resistance. However, Ce segregation reduces the cohesive strength of GBs, making transverse GB regions with Ce segregation more susceptible to decohesion under high stress, leading to cavity nucleation. Continuous cavity nucleation weakens GB tensile strength, while interfacial cracking of the chromium carbides promotes cavity coalescence, forming intergranular microcracks. The propagation of these microcracks ultimately induces intergranular fracture and reduces creep plasticity.http://www.sciencedirect.com/science/article/pii/S2238785425007768Austenitic stainless steelCreep damageCeIntergranular cavityFirst-principles |
| spellingShingle | Chongqing Tan Xiaoqiang Hu Renxian Yang Dianzhong Li Effect of Ce on creep damage behaviors of 316LN austenitic stainless steel at 650 °C/225 MPa Journal of Materials Research and Technology Austenitic stainless steel Creep damage Ce Intergranular cavity First-principles |
| title | Effect of Ce on creep damage behaviors of 316LN austenitic stainless steel at 650 °C/225 MPa |
| title_full | Effect of Ce on creep damage behaviors of 316LN austenitic stainless steel at 650 °C/225 MPa |
| title_fullStr | Effect of Ce on creep damage behaviors of 316LN austenitic stainless steel at 650 °C/225 MPa |
| title_full_unstemmed | Effect of Ce on creep damage behaviors of 316LN austenitic stainless steel at 650 °C/225 MPa |
| title_short | Effect of Ce on creep damage behaviors of 316LN austenitic stainless steel at 650 °C/225 MPa |
| title_sort | effect of ce on creep damage behaviors of 316ln austenitic stainless steel at 650 °c 225 mpa |
| topic | Austenitic stainless steel Creep damage Ce Intergranular cavity First-principles |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425007768 |
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