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 : SEP 1972

Pagination or Media Count : 142

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