Microstructure evolution of a pre-compression nickel-base single crystal superalloy during tensile creep

Microstructure evolution of a nickel-base single crystal superalloy during thermal exposure at 982°C was investigated. The SEM studies revealed that the size of γ' phase increased and some of which linked together with the elongation of the exposure time. There is acicular phase precipitation after the long-term ageing treatment. The TCP phase is not increased by the increment of ageing time after reaching a certain amount. There are skeleton shape carbides precipitate after 100h and 300h. The amount of precipitated carbides decreases by the elongation of ageing time.

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Investigation on γ-Channel Widening during Uniaxial Creep Test of a Ni-Base Single Crystal Superalloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.449-452.545 ◽

2004 ◽

Vol 449-452 ◽

pp. 545-548

Author(s):

Tao Jin ◽

L.R. Liu ◽

Na Ru Zhao ◽

Zhi Wang ◽

Xiao Feng Sun ◽

...

Keyword(s):

Single Crystal ◽

Single Crystal Superalloy ◽

Tensile Creep ◽

Uniaxial Tensile ◽

Creep Tests ◽

Uniaxial Creep ◽

The Mean ◽

Channel Widening ◽

Nickel Base ◽

Temperature Time

Investigation of γ -channel widening behavior in a nickel-base single crystal superalloy during uniaxial tensile creep tests was carried out. Scanning electron microscopy (SEM) was adopted to reveal the microstructural evolution of γ -channel and the dimension of γ -channel. It was found that different tests condition such as temperature, time and stress in tensile creep tests all influenced the γ -channel widening behavior, and a parabolic rate law governs the mean increase value of γ -channel width. The stress and temperature enhanced the γ -channel widening. The γ -channel widening was the result of directionally diffusion of multiatom.

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Microstructure Evolution and Strain Features of a Single Crystal Nickel Base Superalloy during Tensile/Compression Creep

Materials Science Forum ◽

10.4028/www.scientific.net/msf.546-549.1225 ◽

2007 ◽

Vol 546-549 ◽

pp. 1225-1228

Author(s):

Fan Lai Meng ◽

Su Gui Tian ◽

Ming Gang Wang ◽

Xing Fu Yu ◽

Hong Qiang Du ◽

...

Keyword(s):

Single Crystal ◽

Microstructure Evolution ◽

Tensile Creep ◽

Stress Axis ◽

Nickel Base Superalloy ◽

Direction Parallel ◽

Compression Creep ◽

Nickel Base ◽

P Type ◽

Base Superalloy

By means of tensile and compression creep testing and SEM, TEM observation, an investigation has been made into the microstructure evolution of a single crystal nickel base superalloy during tensile / compression creep. Results show that the cubic γ′ phase in the superalloy is transformed into the N-type meshlike structure along the direction vertical to stress axis during tensile creep. The cubic γ′ phase is transformed into the P-type structure along the direction parallel to stress axis during compression creep. An obvious asymmetry strain of the alloy occurs during tensile and compression creep, the formation of the needle-like γ′ rafts during compression creep is a main reason of the alloy displaying a smaller strain. During compressive creep, the deformation feature of the alloy is the <110> and (1/3) <112> super dislocations shearing into the γ′ rafts. The deformation mechanism of the alloy, in the stage state of tensile creep, is dislocation climb over the γ′ rafts.

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Creep property and microstructure evolution of a nickel-base single crystal superalloy in [011] orientation

Materials Characterization ◽

10.1016/j.matchar.2013.09.019 ◽

2013 ◽

Vol 86 ◽

pp. 177-184 ◽

Cited By ~ 17

Author(s):

G.M. Han ◽

J.J. Yu ◽

Z.Q. Hu ◽

X.F. Sun

Keyword(s):

Single Crystal ◽

Microstructure Evolution ◽

Creep Property ◽

Single Crystal Superalloy ◽

Nickel Base

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Microstructure evolution of a [011] orientation single crystal nickel-base superalloy during tensile creep

Applied Physics A ◽

10.1007/s00339-011-6302-7 ◽

2011 ◽

Vol 104 (2) ◽

pp. 643-647 ◽

Cited By ~ 12

Author(s):

Sugui Tian ◽

Yong Su ◽

Lili Yu ◽

Huichen Yu ◽

Shu Zhang ◽

...

Keyword(s):

Single Crystal ◽

Microstructure Evolution ◽

Tensile Creep ◽

Nickel Base Superalloy ◽

Nickel Base ◽

Base Superalloy

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The Influence of Thermal Exposure on the Microstructure Evolution of a Nickel-Base Single Crystal Superalloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.418-420.265 ◽

2011 ◽

Vol 418-420 ◽

pp. 265-269

Author(s):

Yu Xian Jia ◽

Tao Jin ◽

Jin Lai Liu

Keyword(s):

Single Crystal ◽

Exposure Time ◽

Microstructure Evolution ◽

Thermal Exposure ◽

Single Crystal Superalloy ◽

Matrix Channel ◽

Oriented Samples ◽

Tcp Phase ◽

Nickel Base ◽

Sem Studies

Microstructure evolution of a nickel-base single crystal superalloy on the [001], [011] and [111] orientation during thermal exposure at 1000°C was investigated. The SEM studies revealed that the size of γ' phase increased and some of which linked together with the elongation of the exposure time. After 1100h the cubic γ' phase hardly is observed, and the rafting structure becomes perfect. With growing and linking of γ' phase the γ matrix channel is widening gradually, and the direction of γ' rafts is not along one define orientation. The TCP phase is not found in the three oriented samples during the thermal exposure.

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The Effect of Tensile Stress on Oxidation Behavior of Nickel-Base Single Crystal Superalloy

Corrosion Science ◽

10.1016/j.corsci.2021.109737 ◽

2021 ◽

pp. 109737

Author(s):

Hai-Qing Pei ◽

Meng Li ◽

Ping Wang ◽

Xiao-Hu Yao ◽

Zhi-Xun Wen ◽

...

Keyword(s):

Tensile Stress ◽

Single Crystal ◽

Oxidation Behavior ◽

Single Crystal Superalloy ◽

Nickel Base

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Time Dependence of γ/γ' Lattice Mismatch in Creep-Deformed Single Crystal Superalloy SC16 at 1173 K

Materials Science Forum ◽

10.4028/www.scientific.net/msf.539-543.3059 ◽

2007 ◽

Vol 539-543 ◽

pp. 3059-3063 ◽

Cited By ~ 2

Author(s):

G. Schumacher ◽

N. Darowski ◽

I. Zizak ◽

Hellmuth Klingelhöffer ◽

W. Chen ◽

...

Keyword(s):

Single Crystal ◽

Lattice Mismatch ◽

Lattice Misfit ◽

Peak Position ◽

Single Crystal Superalloy ◽

Tensile Creep ◽

Full Width ◽

X Ray Diffraction ◽

X Ray ◽

Time Period

The profiles of 001 and 002 reflections have been measured at 1173 K as a function of time by means of X-ray diffraction (XRD) on tensile-creep deformed specimens of single crystal superalloy SC16. Decrease in line width (full width at half maximum: FWHM) by about 7 % and increase in peak position by about 3x10-4 degrees was detected after 8.5x104 s. Broadening of the 002 peak profile indicated a more negative value of the lattice misfit after the same time period. The results are discussed in the context of the anisotropic arrangement of dislocations at the γ/γ’ interfaces during creep and their rearrangement during the thermal treatment at 1173 K.

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