TRANSFORMATION KINETICS AND HEAT TREATMENT OF U-Cr ALLOYS

Journal Article · Thu Nov 01 04:00:00 EST 1962 · Nippon Genshiryoku Gakkaishi (Japan)

DOI:https://doi.org/10.3327/jaesj.4.789· OSTI ID:4721930

Soeno, K

The kinetics of the BETA -to- alpha transformation in nucleation and growth mechanism, and the effect of the conditions of heat treatment on grain size, were studied on alloys containing from 0.25 to 1.0 at. % Cr. Nearly constant activation energies, which vary from 32 to 38 kcal/g-atom with the content of alloying element, correspond to the temperature regions below the noses of T-T-T diagrams. And more effect of isothermal transformation temperature on grain size was observed in the temperature region above the nose of T-T-T diagram than below, but the effect of the content of alloying element is not conspicuous in whole temperature region, so far as nucleation and growth mechanism is concerned. As grain size is, in general, discontinuously increased by martensitic transformation, the lower limit of temperature which produces fine structure in isothermal transformation is correspondence to the upper limit of the beginning of martensitic transformation. Ms ( BETA -to- alpha ) temperatures are determined with alloys containing from 0.25 to 1.0 at.% Cr. (auth)

• Research Organization: Hitochi Ltd., Tokyo
• Sponsoring Organization: USDOE
• NSA Number: NSA-17-008846
• OSTI ID: 4721930
• Journal Information: Nippon Genshiryoku Gakkaishi (Japan), Journal Name: Nippon Genshiryoku Gakkaishi (Japan) Vol. Vol: 4; ISSN NGEGA
• Country of Publication: Country unknown/Code not available
• Language: Japanese

Related Subjects

ALLOTROPY
CHROMIUM ALLOYS
DIAGRAMS
GRAIN SIZE
HEAT TREATMENTS
MARTENSITE
METALS, CERAMICS, AND OTHER MATERIALS
REACTION KINETICS
TEMPERATURE
URANIUM ALLOYS