Evaluation of Multicomponent Nickel Base LI2 and Other Intermetallic Alloys as High Temperature Structural Materials

1986 ◽  
Vol 81 ◽  
Author(s):  
D. M. Shah ◽  
D. N. Duhl
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Single Crystals ◽  
Impact Resistance ◽  
High Strength ◽  
Structural Materials ◽  
Nickel Base Superalloy ◽  
Intermetallic Alloys ◽  
Nickel Base ◽  
Base Superalloy

AbstractMulticomponent nickel base intermetallics with the L12 structure were evaluated as high temperature structural materials. The compounds were based on the γ' composition of PWA 1480, a high strength single crystal nickel base superalloy. The best balance of properties in the compound was achieved with <111> oriented single crystals but no significant advantage could be demonstrated over the precipitation hardened superalloys. Insufficient impact resistance was a major deficiency of the L12 compounds. Other nickel base intermetallics were also evaluated but showed little advantage over superalloys.

Formation and role of dislocation networks during high temperature creep of a single crystal nickel–base superalloy

2000 ◽  
Vol 279 (1-2) ◽  
pp. 160-165 ◽  
Author(s):  
Tian Sugui ◽  
Zhou Huihua ◽  
Zhang Jinghua ◽  
Yang Hongcai ◽  
Xu Yongbo ◽  
...  
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Nickel Base Superalloy ◽  
High Temperature Creep ◽  
Temperature Creep ◽  
Nickel Base ◽  
Base Superalloy

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.

ALTEMP 718 ALLOY

Alloy Digest ◽  
1994 ◽  
Vol 43 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Nickel Base Superalloy ◽  
Temperature Performance ◽  
Nickel Base ◽  
Base Superalloy

Abstract ALTEMP 718 ALLOY is an austenitic nickel-base superalloy used in applications requiring high strength to approximately 1400 F (760 C) and oxidation resistance to approximately 1800 F (982 C). The alloy is age-hardenable. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as heat treating and joining. Filing Code: Ni-444. Producer or source: Allegheny Ludlum Corporation.

Low Cycle Fatigue of Single Crystal Nickel-Base Superalloy CMSX-4 Coated With a New Coating IC1

Materials ◽  
2005 ◽  
Author(s):  
Svjetlana Stekovic
Keyword(s):  
Fatigue Life ◽  
Single Crystal ◽  
Low Cycle Fatigue ◽  
High Strength ◽  
Nickel Base Superalloy ◽  
Cycle Fatigue ◽  
Ductile To Brittle Transition ◽  
Nickel Base ◽  
Oxidation And Corrosion ◽  
Base Superalloy

High strength nickel base superalloys have often been used in turbine blades because of their superior performances at high temperatures. One of them is CMSX-4, an ultra high strength, single crystal. CMSX-4 is a second generation rhenium-containing, nickel-base superalloy capable of high temperature and stress operations of at least 1150 °C [1]. The superalloy has limited oxidation and corrosion resistance at the high temperatures and to improve the oxidation and corrosion resistance, the base material is protected with coatings [2]. However, coatings exhibit a ductile-to-brittle transition temperature (DBTT) which causes early cracking of the coating and failure due to fatigue. The paper details low cycle fatigue (LCF) properties and degradation mechanisms of uncoated and IC1 coated single crystal CMSX-4. The tests were performed at two temperatures, 500 °C and 900 °C. Cylindrical solid specimens were cyclically deformed with fully reversed tension-compression loading with total strain amplitude control and at a constant strain rate of 10−4s−5 in air atmosphere without any dwell time. At 500 °C the coating has a detrimental effect on the fatigue life of CMSX-4 while at 900 °C IC1 does improve the fatigue life of the superalloy. The reduction of the fatigue life can be related to early cracking of the coating under its ductile to brittle transition temperature while the beneficial effect of the coating at 900 °C may be due to slower propagation of cracks caused by oxidation at the front of the crack tip.

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