Effect of withdrawal rate on the microsegregation, thermophysical properties and spatial orientation of a Ni3Al based single crystal superalloy

The third generation single crystal superalloy DD9 was processed with different withdrawal rates and the effect of withdrawal rate on the tensile and stress rupture properties of the alloy was investigated. The relation between the mechanical properties and microstructure of the alloy with different withdrawal rates was discussed. The results showed that the withdrawal rate had a little effect on the tensile properties at 25 of the alloy. The tensile strength at 980 and stress rupture life at 1120/140MPa of DD9 alloy all increased with the increasing of withdrawal rate. The γ precipitates of specimen tensile at 25 had a little extension in the stress orientation. The extension of γ precipitates in the stress orientation at 980 was much more than that at 25. The vertical γ matrix at 980 became thinner and horizontal γ matrix became thicker slightly. The γ precipitates of those had rafted in a direction transverse to the applied stress.

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Misorientation induced by withdrawal rate transition and its effect on intermediate temperature stress rupture properties of a Ni3Al based single crystal superalloy

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2015.02.226 ◽

2015 ◽

Vol 637 ◽

pp. 77-83 ◽

Cited By ~ 16

Author(s):

Cheng Ai ◽

Jian Zhou ◽

Heng Zhang ◽

Yanling Pei ◽

Shusuo Li ◽

...

Keyword(s):

Single Crystal ◽

Temperature Stress ◽

Stress Rupture ◽

Intermediate Temperature ◽

Single Crystal Superalloy ◽

Withdrawal Rate ◽

Stress Rupture Properties ◽

Rupture Properties

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Effect of the withdrawal rate on the microstructure and thermal durability of a third-generation single crystal superalloy

Progress in Natural Science Materials International ◽

10.1016/j.pnsc.2021.04.010 ◽

2021 ◽

Author(s):

Yunsong Zhao ◽

Mai Zhang ◽

Luyan Yang ◽

Yuanyuan Guo ◽

Jian Zhang ◽

...

Keyword(s):

Single Crystal ◽

Single Crystal Superalloy ◽

Withdrawal Rate ◽

Third Generation ◽

Thermal Durability

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Interface Morphologies and Microstructure of a Single Crystal Superalloy under High Thermal Gradient Directional Solidification

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.665 ◽

2005 ◽

Vol 475-479 ◽

pp. 665-668 ◽

Cited By ~ 3

Author(s):

Lin Liu ◽

Jun Zhang ◽

Taiwen Hang ◽

Heng Zhi Fu

Keyword(s):

Single Crystal ◽

Directional Solidification ◽

Cooling Rate ◽

Thermal Gradient ◽

Cellular Structure ◽

Single Crystal Superalloy ◽

Withdrawal Rate ◽

High Rate ◽

High Thermal Gradient ◽

Withdrawal Speed

The interface morphologies single crystal superalloys CMSX-2 has been studied over a range of cooling rate with large variations in withdrawal speed in directional solidification. The superfine cellular structure was obtained under both high thermal gradient up to 1000K/cm and fast withdrawal rate up to 1mm/sec. The high rate directional solidification results in reduction in primary and secondary dendrite arm spacing, refinement of λ’ phase, reduced microsegregation of alloying elements and smaller size of γ-γ’ eutectics.

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