Creep behaviour of alloy 690 in the temperature range 800–1000 °C
The creep behaviour of Ni-base superalloy 690 has been studied in the temperature range of 800–1000 °C, and stress range of 25–105 MPa under constant load creep conditions. The alloy follows a power-law creep behaviour in the tested conditions and obeys a Monkman-Grant relationship. All the creep da...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2022-03-01
|
| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422000606 |
| _version_ | 1818312575491768320 |
|---|---|
| author | Kumar Sourabh J.B. Singh |
| author_facet | Kumar Sourabh J.B. Singh |
| author_sort | Kumar Sourabh |
| collection | DOAJ |
| description | The creep behaviour of Ni-base superalloy 690 has been studied in the temperature range of 800–1000 °C, and stress range of 25–105 MPa under constant load creep conditions. The alloy follows a power-law creep behaviour in the tested conditions and obeys a Monkman-Grant relationship. All the creep data points lay within a ±5% scatter band of the Larson-Miller parameter vs. log stress plot. The alloy spent more than 50% of its life in the tertiary regime and failed predominantly by cavitation. Creep parameters, like apparent activation energy and stress exponent, were relatively high (∼363–498 kJ/mol and 5.5–7, respectively). A high value of the apparent activation energy has been attributed to the resistance of fine carbide particles that form during creep. The microstructural sub-structure of creep deformed samples shows subgrains separated by low angle grain boundaries and randomly oriented dislocations suggesting dislocation climb as the rate-controlling creep mechanism. |
| first_indexed | 2024-12-13T08:20:02Z |
| format | Article |
| id | doaj.art-5c40675fef8e43a98fe5cac41c14693b |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-13T08:20:02Z |
| publishDate | 2022-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-5c40675fef8e43a98fe5cac41c14693b2022-12-21T23:54:01ZengElsevierJournal of Materials Research and Technology2238-78542022-03-011715531569Creep behaviour of alloy 690 in the temperature range 800–1000 °CKumar Sourabh0J.B. Singh1Homi Bhabha National Institute, Anushakti Nagar, Mumbai, 400 094, India; Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Mumbai, 400 085, IndiaHomi Bhabha National Institute, Anushakti Nagar, Mumbai, 400 094, India; Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India; Corresponding author.The creep behaviour of Ni-base superalloy 690 has been studied in the temperature range of 800–1000 °C, and stress range of 25–105 MPa under constant load creep conditions. The alloy follows a power-law creep behaviour in the tested conditions and obeys a Monkman-Grant relationship. All the creep data points lay within a ±5% scatter band of the Larson-Miller parameter vs. log stress plot. The alloy spent more than 50% of its life in the tertiary regime and failed predominantly by cavitation. Creep parameters, like apparent activation energy and stress exponent, were relatively high (∼363–498 kJ/mol and 5.5–7, respectively). A high value of the apparent activation energy has been attributed to the resistance of fine carbide particles that form during creep. The microstructural sub-structure of creep deformed samples shows subgrains separated by low angle grain boundaries and randomly oriented dislocations suggesting dislocation climb as the rate-controlling creep mechanism.http://www.sciencedirect.com/science/article/pii/S2238785422000606Alloy 690Creep behaviourActivation energyStress exponentCreep deformation mechanism mapCreep fracture |
| spellingShingle | Kumar Sourabh J.B. Singh Creep behaviour of alloy 690 in the temperature range 800–1000 °C Journal of Materials Research and Technology Alloy 690 Creep behaviour Activation energy Stress exponent Creep deformation mechanism map Creep fracture |
| title | Creep behaviour of alloy 690 in the temperature range 800–1000 °C |
| title_full | Creep behaviour of alloy 690 in the temperature range 800–1000 °C |
| title_fullStr | Creep behaviour of alloy 690 in the temperature range 800–1000 °C |
| title_full_unstemmed | Creep behaviour of alloy 690 in the temperature range 800–1000 °C |
| title_short | Creep behaviour of alloy 690 in the temperature range 800–1000 °C |
| title_sort | creep behaviour of alloy 690 in the temperature range 800 1000 °c |
| topic | Alloy 690 Creep behaviour Activation energy Stress exponent Creep deformation mechanism map Creep fracture |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422000606 |
| work_keys_str_mv | AT kumarsourabh creepbehaviourofalloy690inthetemperaturerange8001000c AT jbsingh creepbehaviourofalloy690inthetemperaturerange8001000c |