Accession Number:

ADA207161

Title:

High Temperature Oxidation Studies on Alloys Containing Dispersed Phase Particles and Clarification of the Mechanism of Growth of SiO2

Descriptive Note:

Final rept. 15 Aug 1985-31 Dec 1988

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s):

Report Date:

1989-02-14

Pagination or Media Count:

30.0

Abstract:

In most binary transition metal alloys, additions of Cr are used to promote the formation of a protective cr2O3 layer. Once formed, this layer acts as a barrier between the metal and its environment and, thereby, prolongs service life of the alloy. The ability to form such a layer depends upon a complex interaction of variables the most influential being the concentration of Cr present in the alloy. In fact, there is a critical concentration of Cr, below which a complete, protective CR2O3 scale will not form. Under the severe conditions employed in this investigation, upwards of 18 weight percent Cr is required to form a protective layer in the binary Ni-Cr and Fe-Cr alloys.

Subject Categories:

  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE