Embrittlement of Precipitation Hardenable Nickel-Base Alloys by Oxygen

1971 ◽  
Vol 93 (2) ◽  
pp. 225-230 ◽  
Author(s):  
M. Prager ◽  
G. Sines
Keyword(s):  
Grain Size ◽  
Surface Energy ◽  
Base Alloy ◽  
Tensile Tests ◽  
Inert Atmosphere ◽  
Nickel Base Alloy ◽  
Gamma Prime ◽  
Tensile Fractures ◽  
Nickel Base ◽  
Short Time

A study was made of the embrittling effects of oxygen on Rene´ 41, a nickel-base alloy hardened by precipitation of gamma prime. In short time tensile tests in air it was found that from 750 to 900 deg C oxygen promoted initiation and rapid propagation of intergranular cracks, while in the absence of oxygen, tensile fractures were transgranular and ductility was much improved. Sensitivity to embrittlement by oxygen decreases with coarsening of gamma prime. When gamma prime is hyperfine, probably less than 100 Å, embrittlement is greatest and follows the predictions of a Petch-Stroh model for the initiation of cracks ahead of pile-ups of dislocations. In accordance with the model, the ductility of Rene´ 41 increased in proportion of the reciprocal of the square roo of grain size. Calculated on the basis of the model, the surface energy of Rene´ 41 in air was 400 ergs/cm2, considerably lower than would be expected for an alloy of nickel in an inert atmosphere.

INCONEL ALLOY 604

Alloy Digest ◽  
1962 ◽  
Vol 11 (3) ◽  
Keyword(s):  
Tensile Strength ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Rupture Strength ◽  
Base Alloy ◽  
Heat Treating ◽  
Nickel Base Alloy ◽  
Inconel Alloy ◽  
Nickel Base ◽  
Short Time

Abstract INCONEL Alloy 604, nickel-base alloy, has better high temperature properties than Inconel Alloy, particularly where rupture strength, creep, and short-time tensile strength are necessary. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-70. Producer or source: Huntington Alloy Products Division, An INCO Company.

INCONEL 600

Alloy Digest ◽  
1960 ◽  
Vol 9 (3) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Rupture Strength ◽  
Base Alloy ◽  
Heat Treating ◽  
Nickel Base Alloy ◽  
Inconel Alloy ◽  
Inconel 600 ◽  
Nickel Base ◽  
Short Time

Abstract INCONEL 600 nickel-base alloy has better high temperature properties than Inconel alloy, particularly where rupture strength, creep and short-time tensile are necessary. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-56. Producer or source: Huntington Alloy Products Division, An INCO Company.

ALLVAC 718-OP

Alloy Digest ◽  
2003 ◽  
Vol 52 (3) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Base Alloy ◽  
Melting Process ◽  
Heat Treating ◽  
Nickel Base Alloy ◽  
Gamma Prime ◽  
Temperature Performance ◽  
Nickel Base

Abstract Allvac 718-OP is a versatile alloy that is vacuum induction melted followed by a consumable melting process. The alloy is a special chemistry vacuum melted version of standard Allvac 718. It is a precipitation-hardenable, nickel-base alloy that can be used from -253 deg C (-423 deg F) to 704 deg C (1300 deg F). The main hardening constituent is a niobium-containing gamma prime precipitate. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-605. Producer or source: Allvac Metals Company.

Metallurgical Assessment of Degradation of a Gas Turbine Bucket Made of Inconel 738LC Alloy After 24000 H in Service

2004 ◽  
Author(s):  
Zdzislaw Mazur ◽  
Alberto Luna-Rami´rez ◽  
Julio A. Jua´rez-Islas
Keyword(s):  
Gas Turbine ◽  
Base Alloy ◽  
Nickel Base Alloy ◽  
Gamma Prime ◽  
Size Characterization ◽  
Nickel Base ◽  
Degradation Degree ◽  
Inconel 738Lc ◽  
Turbine Bucket ◽  
Blade Coating

The assessment of service induced degradation of nickel-base alloy Inconel 738LC of the gas turbine blade airfoil hot section, after 24000 hours of operation at high temperature is presented. The assessment include the blade coating degradation, changes of the gamma prime (γ′) phase (aging and coarsening), carbides and brittle phases precipitation, grain type and size characterization, and evaluation of interface coating/base alloy and cracks. The results of blade hot section (airfoil) microstructural assessment are compared to the cold reference zone (bucket root) to show the degradation degree of the alloy and its lifetime consumed. Finally, conclusions are presented indicating the alloy main microstructure elements which influence of blade behavior and the factors that can be used to determine the grade of material deterioration and lifetime consumed.

In situ Transmission Electron Microscopy Tensile Tests of a Peak- to Overaged γ′-strengthened Nickel Base Alloy

2005 ◽  
Vol 20 (7) ◽  
pp. 1722-1727 ◽  
Author(s):  
Dietmar Baither ◽  
Volker Mohles ◽  
Eckhard Nembach
Keyword(s):  
Base Alloy ◽  
Tensile Tests ◽  
Nickel Base Alloy ◽  
Transition Range ◽  
Polycrystalline Specimen ◽  
Thin Foils ◽  
Transmission Electron ◽  
Nickel Base

The commercial nickel base alloy NIMONIC PE16 is strengthened by nano-scale spherical coherent precipitates of the intermetallic γ′-phase Ni3(Al,Ti). A bulk polycrystalline specimen of NIMONIC PE16 was aged such that it was in the transition range from the peak- to the overaged state. This transition limits the duration of technically useful aging treatments of structural particle strengthened materials. Thin foils prepared from this specimen were stretched inside a transmission electron microscope, and the dislocation processes were observed under full load. Two dislocations with identical Burgers vectors of the type 1/2〈110〉 form a pair and glide together. The leading 1/2〈110〉 dislocation bypasses the γ′-precipitates and the trailing one shears them. These dislocation processes are also discussed with reference to the results of computer simulations.

The Nature of Delta Phase Precipitation in Inconel 718

1982 ◽  
Vol 40 ◽  
pp. 724-725
Author(s):  
L. S. Lin ◽  
C. C. Law
Keyword(s):  
Inconel 718 ◽  
Base Alloy ◽  
High Strength ◽  
Physical Metallurgy ◽  
Nickel Base Alloy ◽  
Phase Precipitation ◽  
Weight Percentage ◽  
Delta Phase ◽  
The Subject ◽  
Nickel Base

Inconel 718, a precipitation hardenable nickel-base alloy, is a versatile high strength, weldable wrought alloy that is used in the gas turbine industry for components operated at temperatures up to about 1300°F. The nominal chemical composition is 0.6A1-0.9Ti-19.OCr-18.0Fe-3Mo-5.2(Cb + Ta)- 0.1C with the balance Ni (in weight percentage). The physical metallurgy of IN 718 has been the subject of a number of investigations and it is now established that hardening is due, primarily, to the formation of metastable, disc-shaped γ" an ordered body-centered tetragonal structure (DO2 2 type superlattice).

ALTEMP HX

Alloy Digest ◽  
1993 ◽  
Vol 42 (10) ◽  
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Base Alloy ◽  
Heat Treating ◽  
Nickel Base Alloy ◽  
Temperature Performance ◽  
Nickel Base

Abstract ALTEMP HX is an austenitic nickel-base alloy designed for outstanding oxidation and strength at high temperatures. The alloy is solid-solution strengthened. Applications include uses in the aerospace, heat treatment and petrochemical markets. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness and creep. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, and joining. Filing Code: Ni-442. Producer or source: Allegheny Ludlum Corporation.

DELORO 716 PM

Alloy Digest ◽  
1993 ◽  
Vol 42 (7) ◽  
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Base Alloy ◽  
Nickel Base Alloy ◽  
Temperature Performance ◽  
Nickel Base

Abstract DELORO 716 PM is a nickel-base alloy recommended for handling conditions of wear, erosion, heat and corrosion when impact is also a consideration. This datasheet provides information on composition, physical properties, and hardness. It also includes information on high temperature performance and wear resistance as well as machining and joining. Filing Code: Ni-435. Producer or source: Deloro Stellite Inc.

MAR-M Alloy 200

Alloy Digest ◽  
1965 ◽  
Vol 14 (11) ◽  
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Turbine Blade ◽  
Base Alloy ◽  
Heat Treating ◽  
Nickel Base Alloy ◽  
Temperature Performance ◽  
Nickel Base

Abstract MAR-M Alloy 200 is a nickel-base alloy designed primarily as a cast turbine blade material which retains useful strength up to 1900 F. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on high temperature performance as well as heat treating and joining. Filing Code: Ni-107. Producer or source: Martin Metals Company.

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