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Microstructure and mechanical properties of diffusion bonded single crystal to polycrystalline Ni-based superalloys joint
Highlights ► Single crystal DD3 and polycrystalline GH4169 Ni-based superalloy were diffusion bonded. ► The morphology of γ′ phase changed from cuboidal to columnar shape. ► The size of the γ′ phase in the diffusion zone was less than 1μm. ► The shear strength reached 433MPa accompanied by a dimple fracture.
Abstract Bonding of a single crystal Ni-based superalloy to a polycrystalline Ni-based superalloy was carried out through diffusion bonding and the microstructure and mechanical properties of the joint were investigated. A diffusion zone with a width of 35μm was formed due to elements diffusion. From the single crystal substrate to the diffusion zone, the shape of γ′ phase changed from cuboidal to columnar. The hardness of the diffusion zone was a bit higher, which can be attributed to the precipitation of the fine γ′-strengthening phases. The average shear strength of 433MPa was obtained and the fracture presented a plastic characteristic.
Microstructure and mechanical properties of diffusion bonded single crystal to polycrystalline Ni-based superalloys joint
Highlights ► Single crystal DD3 and polycrystalline GH4169 Ni-based superalloy were diffusion bonded. ► The morphology of γ′ phase changed from cuboidal to columnar shape. ► The size of the γ′ phase in the diffusion zone was less than 1μm. ► The shear strength reached 433MPa accompanied by a dimple fracture.
Abstract Bonding of a single crystal Ni-based superalloy to a polycrystalline Ni-based superalloy was carried out through diffusion bonding and the microstructure and mechanical properties of the joint were investigated. A diffusion zone with a width of 35μm was formed due to elements diffusion. From the single crystal substrate to the diffusion zone, the shape of γ′ phase changed from cuboidal to columnar. The hardness of the diffusion zone was a bit higher, which can be attributed to the precipitation of the fine γ′-strengthening phases. The average shear strength of 433MPa was obtained and the fracture presented a plastic characteristic.
Microstructure and mechanical properties of diffusion bonded single crystal to polycrystalline Ni-based superalloys joint
Liu, Jiakun (author) / Cao, Jian (author) / Lin, Xingtao (author) / Song, Xiaoguo (author) / Feng, Jicai (author)
2013-02-07
5 pages
Article (Journal)
Electronic Resource
English
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