The early stages of tempering in a 3Cr-1. 5Mo steel
In 1959 Baker and Nutting established that the carbides precipitated during the tempering of bainitic 2.25Cr-1Mo pressure vessel steels followed the sequence M/sub 3/C, Mo/sub 2/C, M/sub 7/C/sub 3/, M/sub 23/C/sub 6/ and M/sub 6/C. Titchmarsh and later Pilling and Ridley identified characteristic energy dispersive X-ray spectra for these carbides. Recent studies of the early stages of tempering in a 3Cr-1.5Mo steel have revealed a carbide, containing both chromium and molybdenum, which does not correspond to the above characteristic spectra. Convergent beam electron diffraction (CBED) and energy dispersive X-ray (EDX) analyses have been carried out to investigate the structure and composition of this carbide and also to study the change in tempering kinetics produced by additions of chromium and molybdenum to 2.25Cr-1Mo pressure vessel steels.
- Research Organization:
- Department of Materials Science, University of Southern California, Los Angeles, CA 90089-0241
- OSTI ID:
- 5702011
- Journal Information:
- Scr. Metall.; (United States), Journal Name: Scr. Metall.; (United States) Vol. 20:2; ISSN SCRMB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
360102 -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CARBIDES
CARBON COMPOUNDS
CHROMIUM ADDITIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
COHERENT SCATTERING
CONTAINERS
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRON DIFFRACTION
EMBRITTLEMENT
HEAT AFFECTED ZONE
HEAT TREATMENTS
HIGH TEMPERATURE
HYDROGEN EMBRITTLEMENT
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MICROSTRUCTURE
MOLYBDENUM ADDITIONS
MOLYBDENUM ALLOYS
MOLYBDENUM CARBIDES
MOLYBDENUM COMPOUNDS
PRESSURE EFFECTS
PRESSURE VESSELS
REFRACTORY METAL COMPOUNDS
SCATTERING
STEELS
TEMPERATURE EFFECTS
TEMPERING
TRANSITION ELEMENT COMPOUNDS
WELDED JOINTS
X-RAY DIFFRACTION
ZONES