Suppression of liquation cracking susceptibility via pre-weld heat treatment for manufacturing of CM247LC superalloy turbine blade welds
In this study, the weldability of as-cast CM247LC superalloy was metallurgically evaluated for turbine blade applications in terms of its hot cracking behavior and susceptibility. For this purpose, a real blade was manufactured using a directional solidification casting process, and gas tungsten arc...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2021-11-01
|
| Series: | Journal of Advanced Joining Processes |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666330921000297 |
| _version_ | 1818905082937212928 |
|---|---|
| author | Eun-Joon Chun Ye-Seon Jeong Kyeong-Min Kim Hyungsoo Lee Seong-Moon Seo |
| author_facet | Eun-Joon Chun Ye-Seon Jeong Kyeong-Min Kim Hyungsoo Lee Seong-Moon Seo |
| author_sort | Eun-Joon Chun |
| collection | DOAJ |
| description | In this study, the weldability of as-cast CM247LC superalloy was metallurgically evaluated for turbine blade applications in terms of its hot cracking behavior and susceptibility. For this purpose, a real blade was manufactured using a directional solidification casting process, and gas tungsten arc welding was performed at the tip and cavity of the upper blade. Hot cracking was confirmed in the heat-affected zone of the gas tungsten arc welds, and the cracks were characterized as liquation cracks. Metallurgical solutions to suppress the liquation cracking susceptibility were derived via visualization-based spot-Varestraint test. The alloy subjected to aging treatment exhibited the lowest liquation cracking susceptibility (liquation cracking temperature range: 66 K), while the as-cast alloy specimen exhibited the highest (liquation cracking temperature range: 620 K). The metallurgical mechanisms of the liquation cracking susceptibility of as-cast CM247LC welds were elucidated via microstructural analyses and thermodynamic calculations. The suppressed liquation cracking susceptibility of the aged CM247LC could be explained as follows: (i) reduced MC-type carbide, which lowered the local solidus temperature compared with the equilibrium solidus temperature of CM247LC and (ii) increased solidus temperature owing to γ’ precipitation γ’ within the γ matrix. To validate the suppressed liquation cracking susceptibility of the aged CM247LC specimen in real welding, it was subjected to gas tungsten arc welding. The results indicated considerable suppression of liquation cracking compared with as-cast welds; in particular, the reduced liquation cracking temperature range was well-reflected in the welding. |
| first_indexed | 2024-12-19T21:17:41Z |
| format | Article |
| id | doaj.art-bcc8d9f3b84b464da1a6abe2a0a8e084 |
| institution | Directory Open Access Journal |
| issn | 2666-3309 |
| language | English |
| last_indexed | 2024-12-19T21:17:41Z |
| publishDate | 2021-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Advanced Joining Processes |
| spelling | doaj.art-bcc8d9f3b84b464da1a6abe2a0a8e0842022-12-21T20:05:19ZengElsevierJournal of Advanced Joining Processes2666-33092021-11-014100069Suppression of liquation cracking susceptibility via pre-weld heat treatment for manufacturing of CM247LC superalloy turbine blade weldsEun-Joon Chun0Ye-Seon Jeong1Kyeong-Min Kim2Hyungsoo Lee3Seong-Moon Seo4Department of Advanced Materials Science and Engineering, Kyungnam University, Changwon 51767, Republic of Korea; Department of Mechatronics Engineering, Kyungnam University, Changwon 51767, Republic of Korea; Corresponding author at: Department of Advanced Materials Science and Engineering, Kyungnam University, Changwon 51767, Republic of Korea.Department of Mechatronics Engineering, Kyungnam University, Changwon 51767, Republic of KoreaDepartment of Mechatronics Engineering, Kyungnam University, Changwon 51767, Republic of KoreaHigh Temperature Materials Group, Korea Institute of Materials Science, Changwon 51508, Republic of KoreaHigh Temperature Materials Group, Korea Institute of Materials Science, Changwon 51508, Republic of KoreaIn this study, the weldability of as-cast CM247LC superalloy was metallurgically evaluated for turbine blade applications in terms of its hot cracking behavior and susceptibility. For this purpose, a real blade was manufactured using a directional solidification casting process, and gas tungsten arc welding was performed at the tip and cavity of the upper blade. Hot cracking was confirmed in the heat-affected zone of the gas tungsten arc welds, and the cracks were characterized as liquation cracks. Metallurgical solutions to suppress the liquation cracking susceptibility were derived via visualization-based spot-Varestraint test. The alloy subjected to aging treatment exhibited the lowest liquation cracking susceptibility (liquation cracking temperature range: 66 K), while the as-cast alloy specimen exhibited the highest (liquation cracking temperature range: 620 K). The metallurgical mechanisms of the liquation cracking susceptibility of as-cast CM247LC welds were elucidated via microstructural analyses and thermodynamic calculations. The suppressed liquation cracking susceptibility of the aged CM247LC could be explained as follows: (i) reduced MC-type carbide, which lowered the local solidus temperature compared with the equilibrium solidus temperature of CM247LC and (ii) increased solidus temperature owing to γ’ precipitation γ’ within the γ matrix. To validate the suppressed liquation cracking susceptibility of the aged CM247LC specimen in real welding, it was subjected to gas tungsten arc welding. The results indicated considerable suppression of liquation cracking compared with as-cast welds; in particular, the reduced liquation cracking temperature range was well-reflected in the welding.http://www.sciencedirect.com/science/article/pii/S2666330921000297Turbine bladeCM247LCWeldingLiquation crackingVarestraint testLiquation cracking temperature range |
| spellingShingle | Eun-Joon Chun Ye-Seon Jeong Kyeong-Min Kim Hyungsoo Lee Seong-Moon Seo Suppression of liquation cracking susceptibility via pre-weld heat treatment for manufacturing of CM247LC superalloy turbine blade welds Journal of Advanced Joining Processes Turbine blade CM247LC Welding Liquation cracking Varestraint test Liquation cracking temperature range |
| title | Suppression of liquation cracking susceptibility via pre-weld heat treatment for manufacturing of CM247LC superalloy turbine blade welds |
| title_full | Suppression of liquation cracking susceptibility via pre-weld heat treatment for manufacturing of CM247LC superalloy turbine blade welds |
| title_fullStr | Suppression of liquation cracking susceptibility via pre-weld heat treatment for manufacturing of CM247LC superalloy turbine blade welds |
| title_full_unstemmed | Suppression of liquation cracking susceptibility via pre-weld heat treatment for manufacturing of CM247LC superalloy turbine blade welds |
| title_short | Suppression of liquation cracking susceptibility via pre-weld heat treatment for manufacturing of CM247LC superalloy turbine blade welds |
| title_sort | suppression of liquation cracking susceptibility via pre weld heat treatment for manufacturing of cm247lc superalloy turbine blade welds |
| topic | Turbine blade CM247LC Welding Liquation cracking Varestraint test Liquation cracking temperature range |
| url | http://www.sciencedirect.com/science/article/pii/S2666330921000297 |
| work_keys_str_mv | AT eunjoonchun suppressionofliquationcrackingsusceptibilityviapreweldheattreatmentformanufacturingofcm247lcsuperalloyturbinebladewelds AT yeseonjeong suppressionofliquationcrackingsusceptibilityviapreweldheattreatmentformanufacturingofcm247lcsuperalloyturbinebladewelds AT kyeongminkim suppressionofliquationcrackingsusceptibilityviapreweldheattreatmentformanufacturingofcm247lcsuperalloyturbinebladewelds AT hyungsoolee suppressionofliquationcrackingsusceptibilityviapreweldheattreatmentformanufacturingofcm247lcsuperalloyturbinebladewelds AT seongmoonseo suppressionofliquationcrackingsusceptibilityviapreweldheattreatmentformanufacturingofcm247lcsuperalloyturbinebladewelds |