High Temperature Fatigue of Aged Heavy Section Austenitic Stainless Steels
This work investigates two austenitic stainless steels, Sanicro 25 which is a candidate for high temperature heavy section components of future power plants and Esshete 1250 which is used as a reference material. The alloys were subjected to out-of-phase (OP) thermomechanical fatigue (TMF) testing u...
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| Format: | Article |
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MDPI AG
2021-12-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/1/84 |
| _version_ | 1797498555037908992 |
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| author | Hugo Wärner Guocai Chai Johan Moverare Mattias Calmunger |
| author_facet | Hugo Wärner Guocai Chai Johan Moverare Mattias Calmunger |
| author_sort | Hugo Wärner |
| collection | DOAJ |
| description | This work investigates two austenitic stainless steels, Sanicro 25 which is a candidate for high temperature heavy section components of future power plants and Esshete 1250 which is used as a reference material. The alloys were subjected to out-of-phase (OP) thermomechanical fatigue (TMF) testing under strain-control in the temperature range of 100 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>∘</mo></msup></semantics></math></inline-formula>C to 650 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>∘</mo></msup></semantics></math></inline-formula>C. Both unaged and aged (650 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>∘</mo></msup></semantics></math></inline-formula>C, 3000 h) TMF specimens were tested to simulate service degradation resulting from long-term usage. The scanning electron microscopy methods electron backscatter diffraction (EBSD) and energy dispersive spectroscopy (EDS) were used to analyse and discuss active failure and deformation mechanisms. The Sanicro 25 results show that the aged specimens suffered increased plastic straining and shorter TMF-life compared to the unaged specimens. The difference in TMF-life of the two test conditions was attributed to an accelerated microstructural evolution that provided decreased the effectiveness for impeding dislocation motion. Ageing did not affect the OP-TMF life of the reference material, Esshete 1250. However, the structural stability and its resistance for cyclic deformation was greatly reduced due to coarsening and cracking of the strengthening niobium carbide precipitates. Sanicro 25 showed the higher structural stability during OP-TMF testing compare with the reference material. |
| first_indexed | 2024-03-10T03:35:00Z |
| format | Article |
| id | doaj.art-ab19eeec5e354fd182010560f27637a3 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T03:35:00Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-ab19eeec5e354fd182010560f27637a32023-11-23T11:47:48ZengMDPI AGMaterials1996-19442021-12-011518410.3390/ma15010084High Temperature Fatigue of Aged Heavy Section Austenitic Stainless SteelsHugo Wärner0Guocai Chai1Johan Moverare2Mattias Calmunger3Department of Management and Engineering, Linköping University, 58183 Linköping, SwedenDepartment of Management and Engineering, Linköping University, 58183 Linköping, SwedenDepartment of Management and Engineering, Linköping University, 58183 Linköping, SwedenDepartment of Management and Engineering, Linköping University, 58183 Linköping, SwedenThis work investigates two austenitic stainless steels, Sanicro 25 which is a candidate for high temperature heavy section components of future power plants and Esshete 1250 which is used as a reference material. The alloys were subjected to out-of-phase (OP) thermomechanical fatigue (TMF) testing under strain-control in the temperature range of 100 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>∘</mo></msup></semantics></math></inline-formula>C to 650 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>∘</mo></msup></semantics></math></inline-formula>C. Both unaged and aged (650 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mo>∘</mo></msup></semantics></math></inline-formula>C, 3000 h) TMF specimens were tested to simulate service degradation resulting from long-term usage. The scanning electron microscopy methods electron backscatter diffraction (EBSD) and energy dispersive spectroscopy (EDS) were used to analyse and discuss active failure and deformation mechanisms. The Sanicro 25 results show that the aged specimens suffered increased plastic straining and shorter TMF-life compared to the unaged specimens. The difference in TMF-life of the two test conditions was attributed to an accelerated microstructural evolution that provided decreased the effectiveness for impeding dislocation motion. Ageing did not affect the OP-TMF life of the reference material, Esshete 1250. However, the structural stability and its resistance for cyclic deformation was greatly reduced due to coarsening and cracking of the strengthening niobium carbide precipitates. Sanicro 25 showed the higher structural stability during OP-TMF testing compare with the reference material.https://www.mdpi.com/1996-1944/15/1/84high temperature austenitic stainless steelsout-of-phase thermomechanical fatiguecrack propagation analysiselectron backscatter diffraction (EBSD)energy-dispersive X-ray spectroscopy (EDS) |
| spellingShingle | Hugo Wärner Guocai Chai Johan Moverare Mattias Calmunger High Temperature Fatigue of Aged Heavy Section Austenitic Stainless Steels Materials high temperature austenitic stainless steels out-of-phase thermomechanical fatigue crack propagation analysis electron backscatter diffraction (EBSD) energy-dispersive X-ray spectroscopy (EDS) |
| title | High Temperature Fatigue of Aged Heavy Section Austenitic Stainless Steels |
| title_full | High Temperature Fatigue of Aged Heavy Section Austenitic Stainless Steels |
| title_fullStr | High Temperature Fatigue of Aged Heavy Section Austenitic Stainless Steels |
| title_full_unstemmed | High Temperature Fatigue of Aged Heavy Section Austenitic Stainless Steels |
| title_short | High Temperature Fatigue of Aged Heavy Section Austenitic Stainless Steels |
| title_sort | high temperature fatigue of aged heavy section austenitic stainless steels |
| topic | high temperature austenitic stainless steels out-of-phase thermomechanical fatigue crack propagation analysis electron backscatter diffraction (EBSD) energy-dispersive X-ray spectroscopy (EDS) |
| url | https://www.mdpi.com/1996-1944/15/1/84 |
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