scholarly journals Alloying effects of refractory elements in the dislocation of Ni-based single crystal superalloys

2016 ◽  
Vol 26 (6) ◽  
pp. 636-642 ◽  
Author(s):  
Shiyu Ma ◽  
Jianxin Zhang
Keyword(s):  
Single Crystal ◽  
Refractory Elements ◽  
Alloying Effects

scholarly journals Alloying Effects on Surface Stability and Creep Strength of Nickel Based Single Crystal Superalloys Containing 12 Mass% Cr

2000 ◽  
Author(s):  
Y. Murata ◽  
R. Hashizume ◽  
A. Yoshinari ◽  
N. Aoki ◽  
M. Morinaga ◽  
...  
Keyword(s):  
Single Crystal ◽  
Creep Strength ◽  
Surface Stability ◽  
Alloying Effects

scholarly journals The Interdiffusion Behavior of NiCoCrAlYHf Coating Deposited by Arc Ion Plating on Carburized Ni-Based Single Crystal Superalloy

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7401
Author(s):  
Zun Chen ◽  
Jinyan Zhong ◽  
Shanglin Yang ◽  
Songmei Li ◽  
Jianhua Liu ◽  
...  
Keyword(s):  
Single Crystal ◽  
Cyclic Oxidation ◽  
Oxidation Time ◽  
Single Crystal Superalloy ◽  
Outward Diffusion ◽  
Arc Ion Plating ◽  
Ion Plating ◽  
Refractory Elements ◽  
Carburized Layer ◽  
Interdiffusion Coefficients

In the present study, arc ion plating (AIP) was used to prepare a NiCoCrAlYHf coating (HY5 coating) on a carburized third-generation single-crystal superalloy DD10. The interdiffusion behavior of the carburized superalloy with an HY5 coating was investigated for a 1000 h oxidation time at 1100 °C. Carburization enhanced the interfacial bonding force and improved the microstructure of the NiCoCrAlYHf coating. An interdiffusion zone (IDZ) formed after a 300 h oxidation time, and the formation of a carburized layer effectively suppressed an inward diffusion of cobalt, aluminium, and chromium to the DD10 superalloy as well as an outward diffusion of nickel and refractory elements for instance rhenium and tungsten to the HY5 coating that occurred in static air at 1100 °C. The roles of the carburized layer in affecting thermal cyclic oxidation and element interdiffusion were studied. Subsequently, a modified form of the Boltzmann–Matano analysis was used to present the interdiffusion coefficients of aluminium.

Effect of Ru on Microstructure of a Single Crystal Nickel-Base Superalloy

2007 ◽  
Vol 546-549 ◽  
pp. 1195-1200 ◽  
Author(s):  
Wen You Ma ◽  
Ya Fang Han ◽  
Shu Suo Li ◽  
Yun Rong Zheng ◽  
Sheng Kai Gong
Keyword(s):  
Growth Rate ◽  
High Temperature ◽  
Single Crystal ◽  
Nickel Base Superalloy ◽  
High Temperature Exposure ◽  
Refractory Elements ◽  
Tcp Phase ◽  
Nickel Base ◽  
Temperature Exposure ◽  
Base Superalloy

The effect of Ru on the microstructure of a high content refractory elements nickel base Superalloy has been studied in the present investigation. The results showed that, the adding of 3%Ru did not prevent the precipitation of TCP phase during high temperature exposure, and even accelerated the formation of TCP phase,however the addition of Ru decreased the growth rate of μ phase significantly. In addition, the adding of Ru decreased the solving temperature of γ/γ′ eutectic by 5°C, and increased the tendency of γ′ rafting during high temperature exposure.

scholarly journals Development of Single-Crystal Ni-Base Superalloys Based on Multi-criteria Numerical Optimization and Efficient Use of Refractory Elements

2018 ◽  
Vol 49 (9) ◽  
pp. 4134-4145 ◽  
Author(s):  
M. Markl ◽  
A. Müller ◽  
N. Ritter ◽  
M. Hofmeister ◽  
D. Naujoks ◽  
...  
Keyword(s):  
Single Crystal ◽  
Numerical Optimization ◽  
Refractory Elements

Alloying Effect on the Microstructure and Property of Single Crystal Ni3Al Alloys

1988 ◽  
Vol 133 ◽  
Author(s):  
Zhang Jishan ◽  
Zhang Zhiya ◽  
Tang Yajun ◽  
Zhang Jinghua ◽  
Yu Yang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Al Alloys ◽  
Nickel Base Superalloy ◽  
Al Alloy ◽  
Alloying Effect ◽  
Temperature Range ◽  
Cr Content ◽  
Nickel Base ◽  
Alloying Effects ◽  
Base Superalloy

ABSTRACTThe alloying effects of Cr, Zr, Ta, Nb and B on the microstructure and properties of single crystal Ni3Al alloys have been studied. The strength of the alloys has been improved markedly with promising plasticity. The 0.2% yield stress of some of these alloys is higher than that of IN713C, a typical cast nickel-base superalloy, in the temperature range from 25 to 950°C and some of them reach the strength level of advanced cast nickel-base alloys such as IN100 in the high temperature range. The creep strength of these alloys is also improved markedly. The single crystal Ni3Al alloy with a high Cr content ( 7 at-%) obviously shows an intermediate temperature low plasticity behavior. Although heat treatment can only slightly improve the strength, it can double the elongation of the alloy from 25% to 50%. In the Ni3Al monocrystal containing 1.2at%Zr there exist great amounts of the low melting point Ni5 Zr-γ eutectics around the ordinary γ/γ′ eutectics. This makes it difficult to homogenize the coarse casting structures completely.

Influence of Ru on the Microstructure of Ni-Base Single Crystal Superalloys

2011 ◽  
Vol 306-307 ◽  
pp. 562-571 ◽  
Author(s):  
Fei Sun ◽  
Jian Xin Zhang
Keyword(s):  
Single Crystal ◽  
Volume Fraction ◽  
Microstructural Stability ◽  
Elevated Temperature Strength ◽  
Solid Solution Strengthening ◽  
Refractory Elements ◽  
Tcp Phases ◽  
Solution Strengthening ◽  
Strengthening Element ◽  
Partitioning Behavior

Addition of Ru in Ni-base single crystal superalloys had been used to improve the elevated temperature strength and other multiple properties. Significant decreases in stacking fault energy of the γ phase and the volume fraction of γ′ phase are observed with the addition of Ru. As well as serving as an effective solid-solution strengthening element in high refractory content Ni-base single crystal superalloys, Ru additions are able to effectively strengthen both the γ and γ′ phases and suppress the formation of TCP phases. Due to the changes in the partitioning behavior of elements and the slight decrease in the supersaturation of refractory elements in γ phase associated with Ru additions, high temperature creep resistance and the microstructural stability of the alloy are improved remarkable. The influence of Ru on the microstructure of Ni-base single crystal superalloys is reviewed.

scholarly journals Alloying Effects of Cr and Re on the Hot-corrosion of Nickel-based Single Crystal Superalloys Coated with a Na2SO4-NaCl Salt

1992 ◽  
Vol 78 (5) ◽  
pp. 821-828 ◽  
Author(s):  
Kazuhiro MATSUGI ◽  
Masahiro KAWAKAMI ◽  
Yoshinori MURATA ◽  
Masahiko MORINAGA ◽  
Natsuo YUKAWA ◽  
...  
Keyword(s):  
Single Crystal ◽  
Hot Corrosion ◽  
Alloying Effects

Alloying effects on sulphur embrittlement of the γ-γ′ interface of nickel-based single-crystal superalloys

2003 ◽  
Vol 83 (3) ◽  
pp. 177-189 ◽  
Author(s):  
Kuiying Chen ◽  
L. R. Zhao ◽  
John S. Tse
Keyword(s):  
Single Crystal ◽  
Alloying Effects

Isothermal Oxidation of Pt Modified and Ru Modified Aluminide Coating on a Fourth Generation Single Crystal Superalloy

2006 ◽  
Vol 522-523 ◽  
pp. 301-308
Author(s):  
Yuki Matsuoka ◽  
Yasuo Matsunaga ◽  
Kiyokazu Nakagawa ◽  
Shigeji Taniguchi
Keyword(s):  
Single Crystal ◽  
Aluminide Coating ◽  
Isothermal Oxidation ◽  
Single Crystal Superalloy ◽  
Fourth Generation ◽  
Outward Diffusion ◽  
Secondary Reaction Zone ◽  
Refractory Elements ◽  
Topologically Close Packed ◽  
Pt Modification

Isothermal oxidation behavior of a 4th generation Ni-base single crystal superalloy with Pt-modified and Ru-modified aluminide coating was examined in a temperature range 1223 to 1373 K in air. Both Pt and Ru modification improve the oxidation resistance of a simple aluminide coating, especially above 1273 K. They allow thin protective and continuous Al2O3 scales to be intact for at least 500 h at temperatures up to 1323 K. However, the Pt modification drastically accelerates the formation of a secondary reaction zone (SRZ). This suggests that Pt promotes the formation of a topologically close-packed phase by lowering the solubility of refractory elements in γ-Ni. In contrast, the Ru modification reduces the SRZ, and is expected to enhance the phase stability under the coating by preventing the depletion of Ru due to its outward diffusion.

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