Effect of grain shape on the stress-rupture property of mechanically alloyed oxide dispersion strengthened Ni-base superalloy at elevated temperature

1996 ◽  
Vol 15 (2) ◽  
pp. 93-95 ◽  
Author(s):  
Lee-Ju Park ◽  
Young G. Kim ◽  
R. M. Haeberle ◽  
A. S. Watwe
Keyword(s):  
Elevated Temperature ◽  
Grain Shape ◽  
Stress Rupture ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Mechanically Alloyed ◽  
Stress Rupture Property ◽  
Base Superalloy

Fine Microstructure of a Mechanically Alloyed Oxide Dispersion Strengthened Nickel-Base Superalloy

1977 ◽  
Vol 35 ◽  
pp. 298-299
Author(s):  
Jordi Marti ◽  
Timothy E. Howson ◽  
David Kratz ◽  
John K. Tien
Keyword(s):  
Solid Solution ◽  
Volume Fraction ◽  
Stress Rupture ◽  
Oxide Dispersion Strengthened ◽  
Solid Solution Alloy ◽  
Oxide Dispersion ◽  
Creep And Stress Rupture ◽  
Mechanically Alloyed ◽  
Fine Microstructure ◽  
Nickel Base

The previous paper briefly described the fine microstructure of a mechanically alloyed oxide dispersion strengthened nickel-base solid solution. This note examines the fine microstructure of another mechanically alloyed system. This alloy differs from the one described previously in that it is more generously endowed with coherent precipitate γ forming elements A1 and Ti and it contains a higher volume fraction of the finely dispersed Y2O3 oxide. An interesting question to answer in the comparative study of the creep and stress rupture of these two ODS systems is the role of the precipitate γ' in the mechanisms of creep and stress rupture in alloys already containing oxide dispersoids.The nominal chemical composition of this alloy is Ni - 20%Cr - 2.5%Ti - 1.5% A1 - 1.3%Y203 by weight. The system receives a three stage heat treatment-- the first designed to produce a coarse grain structure similar to the solid solution alloy but with a smaller grain aspect ratio of about ten.

The Fine Microstructure of a Mechanically Alloyed Oxide Dispersion Strengthened Solid Solution

1977 ◽  
Vol 35 ◽  
pp. 264-265
Author(s):  
Jordi Marti ◽  
John E. Stulga ◽  
John K. Tien
Keyword(s):  
Solid Solution ◽  
Stress Rupture ◽  
Oxide Dispersion Strengthened ◽  
Nickel Base Superalloy ◽  
High Temperature Strength ◽  
Oxide Dispersion ◽  
Mechanically Alloyed ◽  
Base Solid Solution ◽  
Oxide Particles ◽  
Nickel Base

A recent development in powder metallurgy technology, known as mechanical alloying (1), can find applications in alloys which cannot be manufactured by conventional processes, due to high melting temperatures, chemical incompatibility of constituents in the melt, or high reactivity. The process has been utilized in the production of a nickel-base superalloy and a nickel-base solid solution which contain dispersions of fine and inert oxide particles for high temperature strength. As part of a study of the creep and stress rupture behavior of these alloys, the as-received and crept microstructures have been examined using the transmission electron microscope. This note discusses the fine-scale microstructure of the mechanically alloyed oxide dispersion strengthened (ODS) nickel-base solid solution.The alloy has a nominal chemical composition in weight percent of Ni - 20Cr - 0.5Ti - 0.3A1 with O.6Y2O3 oxide particles.

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