Oxidation behaviour of NiCoCrAlYHfZr coating on a fourth generation single crystal superalloy

2021 ◽  
pp. 109522
Author(s):  
S.B. Liu ◽  
W. Li ◽  
L.B. Fu ◽  
T.G. Wang ◽  
S.M. Jiang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Oxidation Behaviour ◽  
Single Crystal Superalloy ◽  
Fourth Generation

Isothermal Oxidation of René N5 at 1150°C

2018 ◽  
Author(s):  
Megan Walker ◽  
Xiao Huang
Keyword(s):  
Single Crystal ◽  
Exposure Time ◽  
Bond Coat ◽  
Isothermal Oxidation ◽  
Oxidation Behaviour ◽  
Single Crystal Superalloy ◽  
Short Term ◽  
Alumina Layer ◽  
Spinel Layer ◽  
Oxide Spallation

In this study, single crystal superalloy René N5 was exposed in air at 1150 °C for up to 16 hours to evaluate the alloy’s short-term oxidation behaviour and the potential for developing a no-bond coat TBC system. The results showed that after 1 hour of exposure, a three layered oxide developed on the surface, consisting of spinel, Ta-containing oxide and alumina just above the substrate. After 4 hours of exposure, oxide spallation occurred; this became more pronounced after 16 hours. The oxide spallation took place between the top spinel layer and alumina layer, where Ta-rich oxide was more abundant. All samples tested for 0.5, 1, 2, 4 and 16 hours developed alumina near the substrate while the occurrence of NiO, spinel and Ta-oxides varied, depending upon the exposure time.

scholarly journals Effects of Alloying Additions on the Creep Strength of a Fourth Generation Single-Crystal Superalloy

2004 ◽  
Vol 68 (3) ◽  
pp. 206-209 ◽  
Author(s):  
Yutaka Koizumi ◽  
Toshiharu Kobayashi ◽  
Tadaharu Yokokawa ◽  
Makoto Osawa ◽  
Hiroshi Harada ◽  
...  
Keyword(s):  
Single Crystal ◽  
Creep Strength ◽  
Single Crystal Superalloy ◽  
Fourth Generation ◽  
Alloying Additions

New configuration of a [001] superdislocation formed during high-temperature creep in the γ′ phase of a single-crystal superalloy TMS-138

2006 ◽  
Vol 21 (3) ◽  
pp. 647-654 ◽  
Author(s):  
J.X. Zhang ◽  
H. Harada ◽  
Y. Koizumi
Keyword(s):  
High Temperature ◽  
Tensile Test ◽  
Single Crystal ◽  
Creep Rupture ◽  
Single Crystal Superalloy ◽  
Fourth Generation ◽  
High Temperature Creep ◽  
Burgers Vector ◽  
Temperature Creep ◽  
Interfacial Dislocations

A new configuration of a superdislocation in the γ′ phase of a fourth-generation single-crystal TMS-138 superalloy was found after creep rupture in a [001] tensile test at 1150 °C and 137 MPa. The segments of the superdislocation lie in four directions, i.e., [110], [110], [100], and [010], strictly on a (001) plane with a Burgers vectorb= [001]. This superdislocation is pure edge in character and does not dissociate into superpartials. Microstructural evidence shows that this kind of superdislocation is formed by combination of two interfacial dislocations with different Burgers vectors, i.e., 1/2[011] + 1/2[011] → [001].

Preparation and oxidation behaviour of NiCrAlYSc coatings on a Ni-based single crystal superalloy

2020 ◽  
Vol 171 ◽  
pp. 108703
Author(s):  
S.B. Liu ◽  
W. Li ◽  
J. Sun ◽  
L.B. Fu ◽  
T.G. Wang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Oxidation Behaviour ◽  
Single Crystal Superalloy
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