As-cast microstructure characteristics of K439B nickel-based superalloy thin- walled castings of different thickness
K439B is a new type of nickel-based superalloy with a service temperature up to 800 ℃. In the face of the demand for mass reduction of aircraft， the structure of its components is developing in the direction of thin-wall. Thus， it is necessary to study the microstructure of the K439B alloy thin-wall...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Journal of Materials Engineering
2025-01-01
|
| Series: | Cailiao gongcheng |
| Subjects: | |
| Online Access: | https://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2023.000808 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832592336690872320 |
|---|---|
| author | ZHOU Depeng SUI Dashan MA Jinyuan GUI Daxing DONG Anping SUN Baode |
| author_facet | ZHOU Depeng SUI Dashan MA Jinyuan GUI Daxing DONG Anping SUN Baode |
| author_sort | ZHOU Depeng |
| collection | DOAJ |
| description | K439B is a new type of nickel-based superalloy with a service temperature up to 800 ℃. In the face of the demand for mass reduction of aircraft， the structure of its components is developing in the direction of thin-wall. Thus， it is necessary to study the microstructure of the K439B alloy thin-walled castings. For this purpose， the thin-wall castings with wall thicknesses of 1 mm and 2 mm are designed， and gravity investment casting experiments and numerical simulations are conducted. Comparative analysis of the as-cast microstructure of the castings shows that the growth directions of the dendrites in both 1 mm and 2 mm thin-wall are along the shell wall pointing to the center， the difference is that the growth directions of the dendrites in the 1 mm thin-wall are closer to the vertical angle with the wall. The average primary dendrite arm spacings （PDAS） are 60.64 μm for 1 mm thin-wall and 46.23 μm for 2 mm thin-wall， respectively. The average secondary dendrite arm spacings （SDAS） are 19.31 μm for 1 mm thin-wall and 22.69 μm for 2 mm thin-wall， separately. Meanwhile， the average grain size of the 1 mm thin-wall is 216.61 μm， and the corresponding size of the 2 mm thin-wall is 239.11 μm. Combined with numerical simulation analysis， it is shown that the relationship trend between dendrite arm spacings， temperature gradient， and cooling rate basically matches the existing empirical formula， but the relationship between PDAS and temperature gradient and cooling rate no longer simply matches the formula when the wall thickness is reduced to a certain critical thickness. These results of the experimental and simulation analysis could provide a reference to rationally design the casting process for the K439B nickel-based superalloy thin-walled casting crafts. |
| format | Article |
| id | doaj-art-205894ba0dd94a76aafebb53351637f7 |
| institution | Kabale University |
| issn | 1001-4381 |
| language | zho |
| publishDate | 2025-01-01 |
| publisher | Journal of Materials Engineering |
| record_format | Article |
| series | Cailiao gongcheng |
| spelling | doaj-art-205894ba0dd94a76aafebb53351637f72025-01-21T09:44:41ZzhoJournal of Materials EngineeringCailiao gongcheng1001-43812025-01-01531919810.11868/j.issn.1001-4381.2023.0008081001-4381（2025）01-0091-08As-cast microstructure characteristics of K439B nickel-based superalloy thin- walled castings of different thicknessZHOU Depeng0SUI Dashan1MA Jinyuan2GUI Daxing3DONG Anping4SUN Baode5Institute of Forming Technology & Equipment，School of Materials Science and Engineering，Shanghai Jiao Tong University，Shanghai 200030，ChinaInstitute of Forming Technology & Equipment，School of Materials Science and Engineering，Shanghai Jiao Tong University，Shanghai 200030，ChinaInstitute of Forming Technology & Equipment，School of Materials Science and Engineering，Shanghai Jiao Tong University，Shanghai 200030，ChinaShanghai Xinlanhai Automation Technology Co.，Ltd.，Shanghai 201203，ChinaShanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming，School of Materials Science and Engineering， Shanghai Jiao Tong University，Shanghai 200240，ChinaShanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming，School of Materials Science and Engineering， Shanghai Jiao Tong University，Shanghai 200240，ChinaK439B is a new type of nickel-based superalloy with a service temperature up to 800 ℃. In the face of the demand for mass reduction of aircraft， the structure of its components is developing in the direction of thin-wall. Thus， it is necessary to study the microstructure of the K439B alloy thin-walled castings. For this purpose， the thin-wall castings with wall thicknesses of 1 mm and 2 mm are designed， and gravity investment casting experiments and numerical simulations are conducted. Comparative analysis of the as-cast microstructure of the castings shows that the growth directions of the dendrites in both 1 mm and 2 mm thin-wall are along the shell wall pointing to the center， the difference is that the growth directions of the dendrites in the 1 mm thin-wall are closer to the vertical angle with the wall. The average primary dendrite arm spacings （PDAS） are 60.64 μm for 1 mm thin-wall and 46.23 μm for 2 mm thin-wall， respectively. The average secondary dendrite arm spacings （SDAS） are 19.31 μm for 1 mm thin-wall and 22.69 μm for 2 mm thin-wall， separately. Meanwhile， the average grain size of the 1 mm thin-wall is 216.61 μm， and the corresponding size of the 2 mm thin-wall is 239.11 μm. Combined with numerical simulation analysis， it is shown that the relationship trend between dendrite arm spacings， temperature gradient， and cooling rate basically matches the existing empirical formula， but the relationship between PDAS and temperature gradient and cooling rate no longer simply matches the formula when the wall thickness is reduced to a certain critical thickness. These results of the experimental and simulation analysis could provide a reference to rationally design the casting process for the K439B nickel-based superalloy thin-walled casting crafts.https://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2023.000808k439b nickel-based superalloythin-wall castingdendrite arm spacinggrain sizenumerical simulation |
| spellingShingle | ZHOU Depeng SUI Dashan MA Jinyuan GUI Daxing DONG Anping SUN Baode As-cast microstructure characteristics of K439B nickel-based superalloy thin- walled castings of different thickness Cailiao gongcheng k439b nickel-based superalloy thin-wall casting dendrite arm spacing grain size numerical simulation |
| title | As-cast microstructure characteristics of K439B nickel-based superalloy thin- walled castings of different thickness |
| title_full | As-cast microstructure characteristics of K439B nickel-based superalloy thin- walled castings of different thickness |
| title_fullStr | As-cast microstructure characteristics of K439B nickel-based superalloy thin- walled castings of different thickness |
| title_full_unstemmed | As-cast microstructure characteristics of K439B nickel-based superalloy thin- walled castings of different thickness |
| title_short | As-cast microstructure characteristics of K439B nickel-based superalloy thin- walled castings of different thickness |
| title_sort | as cast microstructure characteristics of k439b nickel based superalloy thin walled castings of different thickness |
| topic | k439b nickel-based superalloy thin-wall casting dendrite arm spacing grain size numerical simulation |
| url | https://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2023.000808 |
| work_keys_str_mv | AT zhoudepeng ascastmicrostructurecharacteristicsofk439bnickelbasedsuperalloythinwalledcastingsofdifferentthickness AT suidashan ascastmicrostructurecharacteristicsofk439bnickelbasedsuperalloythinwalledcastingsofdifferentthickness AT majinyuan ascastmicrostructurecharacteristicsofk439bnickelbasedsuperalloythinwalledcastingsofdifferentthickness AT guidaxing ascastmicrostructurecharacteristicsofk439bnickelbasedsuperalloythinwalledcastingsofdifferentthickness AT donganping ascastmicrostructurecharacteristicsofk439bnickelbasedsuperalloythinwalledcastingsofdifferentthickness AT sunbaode ascastmicrostructurecharacteristicsofk439bnickelbasedsuperalloythinwalledcastingsofdifferentthickness |