Research Catalog

Grain boundary oxidation and an analysis of the effects of pre-oxidation on subsequent fatigue life

Title: Grain boundary oxidation and an analysis of the effects of pre-oxidation on subsequent fatigue life [microform] / Yoshiki Oshida and H.W. Liu ; [performing organization: Syracuse University?].
Author: Oshida, Yoshiki.
Publication: Syracuse, N.Y. : Syracuse University ; [Cleveland, Ohio] : National Aeronautics and Space Administration, Lewis Research Center, [1986]

Details

Additional Authors

Description

i, 36 p. : ill.

Summary

"The effects of preoxidation on subsequent fatigue life were studied. Surface oxidation and grain boundary oxidation of a nickel-base superalloy (TAZ-8A) were studied at 600 to 1000° C for 10 to 1000 hours in air. Surface oxides were identified and the kinetics of surface oxidation was discussed. Grain boundary oxide penetration and morphology were studied. Pancake type grain boundary oxide penetrates deeper and its size is larger, therefore, it is more detrimental to fatigue life than cone-type grain boundary oxide. Oxide penetration depth, a (sub m), is related to oxidation temperature, T, and exposure time, t, by an empirical relation of the Arrhenius type. Effects of T and t on statistical variation of a (sub m) were analyzed according to the Weibull distribution function. Once the oxide is cracked, it serves as a fatigue crack nucleus. Statistical variation of the remaining fatigue life, after the formation of an oxide crack of a critical length, is related directly to the statistical variation of grain boundary oxide penetration depth."--NTIS abstract.

Series Statement

NASA contractor report ; 175051

Uniform Title

NASA contractor report ; NASA CR-175051.

Subject

Note

"February 1986."
Distributed to depository libraries in microfiche.

Bibliography (note)

Includes bibliographical references (p. 20-21).

Reproduction (note)

Microfiche.

Funding (note)

Prepared for Lewis Research Center under grant

Call Number

GPO Microfiche NAS 1.26:175051

OCLC

marcive236142525

Author

Oshida, Yoshiki.

Title

Grain boundary oxidation and an analysis of the effects of pre-oxidation on subsequent fatigue life [microform] / Yoshiki Oshida and H.W. Liu ; [performing organization: Syracuse University?].

Imprint

Syracuse, N.Y. : Syracuse University ; [Cleveland, Ohio] : National Aeronautics and Space Administration, Lewis Research Center, [1986]

Series

NASA contractor report ; 175051

NASA contractor report ; NASA CR-175051.

Bibliography

Includes bibliographical references (p. 20-21).

Reproduction

Microfiche. [Washington, D.C. : National Aeronautics and Space Administration], 1986. 1 microfiche : negative.

Funding

Prepared for Lewis Research Center under grant NAG 3-348

Indexed Term

[NASAT headings] Fatigue life; Grain boundaries; Heat resistant alloys; Oxidation; Crack propagation; Creep properties; Loads (Forces); Morphology; Nickel alloys; X ray spectroscopy

[IAC headings] Nickel alloys, TAZ-8A, Fatigue test, Temp 500 to 899 C, Temp 900 to 1199 C, Air, Oxidation, Surface studies, Grain boundaries, Penetration, Statistical analysis, Electron diffraction, Chromium addition, Chromium depletion, Activation energy, Fatigue crack growth rate, Weibull plot, Regression analysis

Added Author

Liu, H. W. (Hao Wen), 1926-

Syracuse University.

Lewis Research Center.

Other Form:

Online version: Oshida, Yoshiki. Grain boundary oxidation and an analysis of the effects of pre-oxidation on subsequent fatigue life. (OCoLC)796086879

Gpo Item No.

0830-H-14 (MF)

Sudoc No.

NAS 1.26:175051

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