Accession Number:

AD0752930

Title:

The Solutioning and Aging Reactions and their Effect on Hardness and Microstructure in some Columbium Base Alloys.

Descriptive Note:

Technical rept.,

Corporate Author:

CINCINNATI UNIV OHIO DEPT OF MATERIALS SCIENCE AND METALLURGICAL ENGINEERING

Personal Author(s):

• Birla,N. C.
• Hoch,M.

Report Date:

1972-09-01

Pagination or Media Count:

142.0

Abstract:

A study was made to investigate the solutioning and aging reactions and their effects on microstructure and hardness in twenty-four experimental columbium-base alloys, involving Cb-C, Cb-Si-C, Cb-15Hf-C, Cb-15Hf-C-Si, Cb-33Hf-C and Cb-33Hf-C-Si systems. The aging reactions in the Cb-15Hf-C, Cb-15Hf-C-Si, and Cb-33Hf-C-Si alloys are characterized by precipitation of the complex monocarbide Cb, Hf C, O, N phase. Replacement of some of the carbon by silicon in the Cb-15Hf-1C alloys raises the overaging temperature from 800 C to 1000 C and leads to strength retention for longer times than the alloys which contain carbon only. Author

Descriptors:

• (*NIOBIUM ALLOYS
• AGING(MATERIALS))
• HAFNIUM ALLOYS
• CARBON ALLOYS
• SILICON ALLOYS
• HARDNESS
• MICROSTRUCTURE
• SOLUTION HEAT TREATMENT

Subject Categories:

• Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE