The Effect of Temperature and Phase Shift on the Thermomechanical Fatigue of Nickel-Based Superalloy
In this paper, the minimum temperature and phase shift effects on the thermo–mechanical fatigue (TMF) behavior of Inconel 713LC are investigated. TMF tests were performed under 0° (in-phase-IP) and +180° (out-of-phase-OP) phase shifts between mechanical strain and temperature. Cylindrical specimens...
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MDPI AG
2022-06-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/6/993 |
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| author | Ivo Šulák Karel Hrbáček Karel Obrtlík |
| author_facet | Ivo Šulák Karel Hrbáček Karel Obrtlík |
| author_sort | Ivo Šulák |
| collection | DOAJ |
| description | In this paper, the minimum temperature and phase shift effects on the thermo–mechanical fatigue (TMF) behavior of Inconel 713LC are investigated. TMF tests were performed under 0° (in-phase-IP) and +180° (out-of-phase-OP) phase shifts between mechanical strain and temperature. Cylindrical specimens were cycled at constant mechanical strain amplitude with a strain ratio of R<sub>ε</sub> = −1. Tests were performed with temperature ranges of 300–900 °C and 500–900 °C. The heating and cooling rate was 5 °C/s. Fatigue hardening/softening curves and fatigue life data were assessed. Results show that out-of-phase loading was less damaging than in-phase loading. Scanning electron microscopy (SEM) examination of metallographic sections indicated that the life-reducing damage mechanism was intergranular cavitation under in-phase loading. Transmission electron microscopy (TEM) revealed honeycomb structures for IP loading. The plastic strain localization into persistent slip bands was typical for OP loading. For out-of-phase loading, fatigue damage appeared to be dominant. The increase in the temperature range led to a significant decrease in fatigue life. The reduction of fatigue life was far more pronounced for out-of-phase loading. This can be ascribed to the accelerated crack propagation at high tensile stress under out-of-phase loading as well as the amount of accommodated plastic strain deformation. Based on the SEM scrutiny of metallographic sections and TEM observations of dislocation arrangement, the prevailing damage mechanisms were documented and the lifetime behavior was accordingly discussed. |
| first_indexed | 2024-03-09T23:02:53Z |
| format | Article |
| id | doaj.art-5027a0728a7d4603aa1ad6fcbc4b8aef |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T23:02:53Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-5027a0728a7d4603aa1ad6fcbc4b8aef2023-11-23T17:58:30ZengMDPI AGMetals2075-47012022-06-0112699310.3390/met12060993The Effect of Temperature and Phase Shift on the Thermomechanical Fatigue of Nickel-Based SuperalloyIvo Šulák0Karel Hrbáček1Karel Obrtlík2Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech RepublicInstitute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech RepublicInstitute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, 616 00 Brno, Czech RepublicIn this paper, the minimum temperature and phase shift effects on the thermo–mechanical fatigue (TMF) behavior of Inconel 713LC are investigated. TMF tests were performed under 0° (in-phase-IP) and +180° (out-of-phase-OP) phase shifts between mechanical strain and temperature. Cylindrical specimens were cycled at constant mechanical strain amplitude with a strain ratio of R<sub>ε</sub> = −1. Tests were performed with temperature ranges of 300–900 °C and 500–900 °C. The heating and cooling rate was 5 °C/s. Fatigue hardening/softening curves and fatigue life data were assessed. Results show that out-of-phase loading was less damaging than in-phase loading. Scanning electron microscopy (SEM) examination of metallographic sections indicated that the life-reducing damage mechanism was intergranular cavitation under in-phase loading. Transmission electron microscopy (TEM) revealed honeycomb structures for IP loading. The plastic strain localization into persistent slip bands was typical for OP loading. For out-of-phase loading, fatigue damage appeared to be dominant. The increase in the temperature range led to a significant decrease in fatigue life. The reduction of fatigue life was far more pronounced for out-of-phase loading. This can be ascribed to the accelerated crack propagation at high tensile stress under out-of-phase loading as well as the amount of accommodated plastic strain deformation. Based on the SEM scrutiny of metallographic sections and TEM observations of dislocation arrangement, the prevailing damage mechanisms were documented and the lifetime behavior was accordingly discussed.https://www.mdpi.com/2075-4701/12/6/993nickel-based superalloyhigh-temperature fatiguein-phaseout-of-phasecyclic stress–strain curvesfatigue life curves |
| spellingShingle | Ivo Šulák Karel Hrbáček Karel Obrtlík The Effect of Temperature and Phase Shift on the Thermomechanical Fatigue of Nickel-Based Superalloy Metals nickel-based superalloy high-temperature fatigue in-phase out-of-phase cyclic stress–strain curves fatigue life curves |
| title | The Effect of Temperature and Phase Shift on the Thermomechanical Fatigue of Nickel-Based Superalloy |
| title_full | The Effect of Temperature and Phase Shift on the Thermomechanical Fatigue of Nickel-Based Superalloy |
| title_fullStr | The Effect of Temperature and Phase Shift on the Thermomechanical Fatigue of Nickel-Based Superalloy |
| title_full_unstemmed | The Effect of Temperature and Phase Shift on the Thermomechanical Fatigue of Nickel-Based Superalloy |
| title_short | The Effect of Temperature and Phase Shift on the Thermomechanical Fatigue of Nickel-Based Superalloy |
| title_sort | effect of temperature and phase shift on the thermomechanical fatigue of nickel based superalloy |
| topic | nickel-based superalloy high-temperature fatigue in-phase out-of-phase cyclic stress–strain curves fatigue life curves |
| url | https://www.mdpi.com/2075-4701/12/6/993 |
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