Metallographic examination of response of 3 Cr-1. 5 Mo steel to heat treatment
The influence of austenitizing temperature, cooling rate, and tempering conditions on the microstructure of 3 Cr-1.5 Mo steels was examined in order to establish the heat treatment needed to produce fine-grained bainitic microstructures. Most of the work was performed on samples from an 8-ton commercial heat of a composition developed by the Climax Molybdenum Company that contained a manganese addition for hardenability and a vanadium addition for strength. This material was examined in both the normalized-and-tempered and the quenched-and-tempered conditions. The material was found to be fully bainitic in both the coarse- and fine-grained conditions. Additional studies were performed on another 8-ton commercial heat of a composition developed by the University of California, Berkeley, that contained more nickel and less manganese. This material also possessed adequate hardenability to produce bainitic microstructures for cooling conditions that would result in some proeutectoid ferrite in standard 2.25 Cr-1 Mo steel. Both compositions developed the microstructures and concomitant strength and toughness needed to be competitive with other developing microalloyed steels for use in hydrogen service. 17 refs., 15 figs., 5 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6468926
- Report Number(s):
- ORNL/TM-9691; ON: DE86004589
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360100* -- Metals & Alloys
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
COAL GASIFICATION PLANTS
CONTAINERS
CRYSTAL STRUCTURE
DATA
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
HARDNESS
HEAT TREATMENTS
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
METALLOGRAPHY
MICROSCOPY
MICROSTRUCTURE
NUMERICAL DATA
PRESSURE VESSELS
SCANNING ELECTRON MICROSCOPY
STEELS
TENSILE PROPERTIES
TESTING
WELDABILITY
010404 -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360100* -- Metals & Alloys
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
COAL GASIFICATION PLANTS
CONTAINERS
CRYSTAL STRUCTURE
DATA
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
HARDNESS
HEAT TREATMENTS
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
METALLOGRAPHY
MICROSCOPY
MICROSTRUCTURE
NUMERICAL DATA
PRESSURE VESSELS
SCANNING ELECTRON MICROSCOPY
STEELS
TENSILE PROPERTIES
TESTING
WELDABILITY