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Effect of cooling rate and resulting microstructure on tensile properties and deformation mechanisms of an advanced PM nickel-based superalloy

Huang, Hailiang ; Liu, Guoquan ; Wang, Hao ; Wang, Zhicheng ; Zhang, Hongfei ; Shao, Yinlong ; Hu, Benfu

Journal of alloys and compounds, 2019-10, Vol.805, p.1254-1259 [Periódico revisado por pares]

Lausanne: Elsevier B.V

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Título:
Effect of cooling rate and resulting microstructure on tensile properties and deformation mechanisms of an advanced PM nickel-based superalloy
Autor: Huang, Hailiang ; Liu, Guoquan ; Wang, Hao ; Wang, Zhicheng ; Zhang, Hongfei ; Shao, Yinlong ; Hu, Benfu
Assuntos: Chemical precipitation ; Cooling ; Cooling effects ; Cooling rate ; Deformation effects ; Deformation mechanism ; Deformation mechanisms ; Microstructure ; Morphology ; Nickel ; Nickel base alloys ; PM nickel-base superalloy ; Powder metallurgy ; Precipitates ; Shearing ; Solution heat treatment ; Stacking faults ; Superalloys ; Tensile deformation ; Tensile properties ; γ′ precipitation
É parte de: Journal of alloys and compounds, 2019-10, Vol.805, p.1254-1259
Descrição: The powder metallurgy (PM) nickel-based superalloy FGH98 was subjected to solution treatment followed by cooling at three different rates, and the effects of the cooling rate on the microstructure and tensile properties of the alloy at 750 °C were investigated. The results show that as the cooling rate decreases, the average size of secondary γ′ precipitates increases, and the morphology of the secondary γ′ precipitates changes from a near-cuboidal shape to a butterfly shape. As the size of the γ′ precipitates increases, the localized slip occurs more difficultly resulting in improved plasticity. It is found that stacking fault (SF) shearing and microtwinning are the dominant mechanisms of 750 °C tensile deformation for the FGH98 alloy with fine and coarse γ′ precipitates respectively. The increase of γ′ precipitates size is suggested to promote the mechanism transition from SF shearing to microtwinning. •Larger γ′ phase size reduces the local slip and improves plasticity.•SF shearing is the main deformation mechanism in the fine γ′ phase alloy.•Microtwinning is the main deformation mechanism in the coarse γ′ phase alloy.•Larger γ′ phase size promotes the transition from SF shearing to microtwinning.
Editor: Lausanne: Elsevier B.V
Idioma: Inglês

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Effect of cooling rate and resulting microstructure on tensile properties and deformation mechanisms of an advanced PM nickel-based superalloy

Huang, Hailiang ; Liu, Guoquan ; Wang, Hao ; Wang, Zhicheng ; Zhang, Hongfei ; Shao, Yinlong ; Hu, Benfu

Lausanne: Elsevier B.V

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