Journal ArticleDOI
Effects of Argon Contamination in PM Hot Isostatically Pressed Nickel Base Superalloy
TLDR
In this article, the effects of argon contamination in PM MERL 76 hot isostatically pressed at 103·4 MPa (15 ksi) and 193·1 MPa(28 ksi).Abstract:
The effects were studied of argon contamination in PM MERL 76 hot isostatically pressed at 103·4 MPa (15 ksi) and 193·1 MPa (28 ksi). Microstructures were characterized and mechanical properties at 704°C (1300°F) were determined for material containing 59 ppm argon (by weight) in the powder container. Baseline hipped PM MERL 76 was also evaluated. The argon contamination resulted in a significant level of porosity in the final material. Contaminated PM MERL 76 hipped at 103·4 MPa (15 ksi) was 97·6% dense, and that hipped at 193·1 MPa (28 ksi) was 98·7% dense, in both cases after heat treatment. Porosity due to argon adversely affected the notch stress rupture life and tensile properties of the alloy. The creep crack growth resistance was only slightly degraded by argon contamination and the resultant distributed pores. PM/0290read more
Citations
More filters
Journal ArticleDOI
Characterization of entrapped gases in rapidly solidified powders
TL;DR: In this paper, a variety of rapidly solidified powders produced in inert gas environments were analyzed and it was shown that most of the observed gas can be accounted for by the macroscopic gas porosity; however, it is not possible to rule out that a small fraction of the gas may be present in submicroscopic form.
Journal ArticleDOI
Gas Diffusion During Containerless Hot Isostatic Pressing of Liquid‐Phase Sintered Ceramics
Oh-Hun Kwon,Gary L. Messing +1 more
TL;DR: In this article, a theoretical prediction of high-pressure gas permeation is developed based on a diffusion model for sinter-hot isostatic pressed alumina composites and pure glass samples at 1200° to 1600°C.
Book ChapterDOI
8 – Powder Metallurgy and Oxide Dispersion Processing of Superalloys
Janine C. Borofka,John K. Tien +1 more
Journal ArticleDOI
Effect of Solution Heat Treatment on the Porosity Growth of Nickel-Based P/M Superalloys
TL;DR: In this paper , the effect of solution heat treatment on the growth of the TIP of the nickel-based P/M superalloy FGH97 was investigated, and porosity growth models were constructed based on the porosity statistics combined with a nonlinear fitting method.
References
More filters
Journal ArticleDOI
Cavitation in creep
TL;DR: In this paper, the development of our present understanding of the phenomenon of creep cavitation is reviewed, and the status of research into nickel-base superalloys is reviewed with reference being made to such effects as regenerative heat-treatment.
Journal ArticleDOI
The creep fracture of wrought nickel-base alloys by a fracture mechanics approach
TL;DR: In this article, a good correlation was found between the notch properties and the creep behavior of an unnotched sample loaded to the yield strength, but their differences were due primarily to material processing history and not to composition per se.
Journal ArticleDOI
Creep crack growth in alloy 718
K. Sadananda,P. Shahinian +1 more
TL;DR: In this article, the authors studied subcritical crack growth behavior in Alloy 718 under creep conditions at 538, 649, and 760°C (1000, 1200, 1400°F) and correlated crack growth rates were correlated using both linear and nonlinear elastic fracture mechanics.
Journal ArticleDOI
Creep crack propagation by cavitation near crack tips
Rishi Raj,S. Baik +1 more
TL;DR: In this paper, a model in which cracks propagate by nucleation, growth, and coalescence with cavities in front of the crack tip is analyzed in detail and the applied stress field is assumed to be elastic or elastic-plastic, and the relaxation of stresses from the growth of cavitation damage is included in the analysis.