Hardening Mechanisms in a Cobalt-Base Superalloy

reportActive / Technical Report | Accesssion Number: AD0635249 | Open PDF

Abstract:

A study was made of the heat treatment response and hardening mechanism of an experimental cobalt-base superalloy, AR-213. Solution treatment temperatures in the range of 1800 to 2250 F and aging temperatures from 1200 to 1900 F were investigated. Selected aged specimens corresponding to the 2200 F solution treatment were intensively studied using optical and electron microscopy and x-ray techniques to determine the hardening mechanism. The results of the study show that a maximum aged hardness of R sub C 47 is obtainable. The hardening mechanism is the precipitation of CoA1 from the supersaturated matrix at temperatures between 1400 and 1600 F. This precipitate overages relatively rapidly at temperatures above 1600 F. A tantalum-zirconium carbonitride was also present in the alloy in a surprisingly large amount.

Author(s):
Lee, Charles S.
Author Organization(s):
ARIZONA UNIV TUCSON
Funding Organization(s):
Department of the Air Force, Washington, DC
Document Type:
Technical Report/Master's Thesis
Publication Date:
1965 Jan 01
Pagination:
149

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution Code:
A - Approved For Public Release
Distribution Statement: Public Release.
Copyright: Not Copyrighted

RECORD

Collection: TRECMS
Identifying Numbers
Contract Number(s):
AF 33(608)-1205
 Subject Terms
Subject Categories:
Materials
Modernization Areas:
Microelectronics
Communities of Interest:
Descriptor(s):
chemistry, solid solutions, crystal structure, chemical synthesis, electron microscopy, materials, dispersion hardening, physical metallurgy, x-ray diffraction, alloys, chemical analysis, heat treatment, melting point, microscopes, microscopy, phase diagrams, precipitation
Update Date:
2023 Nov 30