Characterisation of Residual Stresses in Machined Surfaces of a High Strength Nickel-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.

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Notch fatigue crack initiation studies in a high strength nickel base superalloy

Engineering Fracture Mechanics ◽

10.1016/0013-7944(87)90047-6 ◽

1987 ◽

Vol 28 (5-6) ◽

pp. 485-503 ◽

Cited By ~ 4

Author(s):

L.F. Coffin

Keyword(s):

Fatigue Crack ◽

Crack Initiation ◽

Fatigue Crack Initiation ◽

High Strength ◽

Nickel Base Superalloy ◽

Nickel Base ◽

Base Superalloy

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An experimental and numerical analysis of residual stresses in a TIG weldment of a single crystal nickel-base superalloy

Journal of Manufacturing Processes ◽

10.1016/j.jmapro.2020.02.007 ◽

2020 ◽

Vol 53 ◽

pp. 190-200 ◽

Cited By ~ 5

Author(s):

Jingwei Chen ◽

Enrico Salvati ◽

Fatih Uzun ◽

Chrysanthi Papadaki ◽

Zifan Wang ◽

...

Keyword(s):

Numerical Analysis ◽

Residual Stresses ◽

Single Crystal ◽

Nickel Base Superalloy ◽

Nickel Base ◽

Base Superalloy

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MAR-M Alloy 421

Alloy Digest ◽

10.31399/asm.ad.ni0141 ◽

1968 ◽

Vol 17 (12) ◽

Keyword(s):

Corrosion Resistance ◽

Physical Properties ◽

Surface Treatment ◽

Gas Turbine ◽

High Strength ◽

Heat Treating ◽

Good Combination ◽

Nickel Base Superalloy ◽

Nickel Base ◽

Base Superalloy

Abstract MAR-M Alloy 421 is a precipitation hardened nickel-base superalloy developed to provide a good combination of high strength, ductility, sulfidation resistance, and stability. It is recommended for gas turbine applications. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on corrosion resistance as well as casting, forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-141. Producer or source: Martin Metals Division.

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SPECIAL METALS INCONEL 740H

Alloy Digest ◽

10.31399/asm.ad.ni0762 ◽

2020 ◽

Vol 69 (9) ◽

Keyword(s):

Corrosion Resistance ◽

Power Plants ◽

Elevated Temperatures ◽

Coal Ash ◽

High Strength ◽

Heat Treating ◽

Nickel Base Superalloy ◽

Unique Combination ◽

Nickel Base ◽

Base Superalloy

Abstract Special Metals Inconel 740H (UNS N07740) is a precipitation hardenable, nickel-base superalloy that offers a unique combination of high strength and creep resistance at elevated temperatures along with resistance to coal ash corrosion. This alloy was originally targeted for use in advanced ultra-supercritical (A-USC) power plants. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: Ni-762. Producer or source: Special Metals Corporation.

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Experimental Study on Cutting Force in Machining Nickel Base Superalloy

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.455.379 ◽

2010 ◽

Vol 455 ◽

pp. 379-382

Author(s):

X.Y. Wang ◽

S.Q. Pang ◽

Q.X. Yu

Keyword(s):

Cutting Force ◽

Elevated Temperatures ◽

High Strength ◽

Cutting Parameters ◽

Advanced Materials ◽

Nickel Base Superalloy ◽

Nickel Based Superalloy ◽

Actual Production ◽

Nickel Base ◽

Base Superalloy

Studies on cutting force lead an extremely important guiding significance in the actual producing. Nickel base superalloy is widely in the manufacture of components for some important industrial areas, because of their ability to retain high-strength at elevated temperatures. It possesses excellent performance as a class of advanced materials. Because of its very poor machinability, the study on cutting force in machining nickel-based superalloy in the actual production or scientific research is relatively less. In this paper, Author aim at two kinds of typical difficult-to-machining materials nickel base superalloy (GH4169, K24). Contrasting with other typical materials ,such as 45# steel and high strength steel 35CrMnSi，study the law of cutting force effected by cutting parameters under the conditions of turning . Intuitive analysis of cutting force changes with the cutting parameters, as well as these characteristics on three-axis force of each type of material, that is to improve its processability and to provide guidance to actual production has a positive significance.

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ALTEMP 718 ALLOY

Alloy Digest ◽

10.31399/asm.ad.ni0444 ◽

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.

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

Materials ◽

10.1115/imece2005-81065 ◽

2005 ◽

Cited By ~ 3

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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