Relationship of bainitic microstructure to impact toughness in Cr-Mo and Cr-W steels

Conference · Wed Jul 01 04:00:00 EDT 1992

OSTI ID:10165200

Klueh, R. L.; Alexander, D. J.

Non-classical bainite microstructures can develop during continuous cooling of low-carbon alloy steels. These differ from classical upper and lower bainite developed by isothermal transformation. Two non-classical bainite microstructures were produced in a 3Cr-1.5Mo0.25V-0.lC steel using different cooling rates after austenitizing--water quenching and air cooling. The carbide-free acicular bainite formed in the quenched steel had a lower ductile-brittle transition temperature (DBTT) than the granular bainite formed in the air-cooled steel. With increasing tempering parameter (defined bv tempering time and temperature), the DBTT of both decreased and approached a common value, although the final value occurred at a much lower tempering parameter for the quenched steel than for the air-cooled steel. The upper-shelf energy was similarly affected by microstructure. These observations along with similar observations in two Cr-W steels indicate that control of the bainite microstructure can be used to optimize strength and toughness.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 10165200
• Report Number(s): CONF-920722--3; ON: DE92017828
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102
360103
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700480
BAINITE
CHARPY TEST
CHROMIUM BASE ALLOYS
CHROMIUM-MOLYBDENUM STEELS
COMPONENT DEVELOPMENT
DUCTILE-BRITTLE TRANSITIONS
IMPACT STRENGTH
MATERIALS STUDIES
MECHANICAL PROPERTIES
MICROSTRUCTURE
STRUCTURE AND PHASE STUDIES
THERMONUCLEAR REACTOR MATERIALS
TUNGSTEN ALLOYS