Characteristics of as-cast and subcritically heat-treated high-chromium-molybdenum white irons for thick-section castings
The hardness, microstructure, abrasive wear resistance and mechanical properties were evaluated for four high-chromium-molybdenum irons in the as-cast condition and after various subcritical heat treatments. After pouring, the irons were cooled to simulate the mold cooling rates in either 100- or 150-mm (4- or 6-in.) -thick plates. Compositions were chosen to provide matrix microstructures which did not contain ferrrite-carbide transformation products in the mold-cooled condition. When cast and cooled as thick sections, matrix microstructures of the as-cast high-chromium-molybdenum irons contained austenite and significant quantities of martensite. Hardness of the as-cast austenitic-martensitic irons was higher than the hardness obtained for predominantly austenitic irons cast in thinner section sizes. Hardness of the irons increased after subcritical heat treatment at around 500/sup 0/C (930/sup 0/F). As-cast and subcritically heat-treated thick-section irons exhibited excellent abrasion resistance similar to that exhibited by martensitic (fully heat treated) high-chromium-molybdenum irons. Mechanical properties of the austenitic-martensitic irons were also comparable to those typically exhibited by martensitic high-chromium-molybdenum irons.
- OSTI ID:
- 5164875
- Country of Publication:
- United States
- Language:
- English
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ALLOYS
CARBIDES
CARBON COMPOUNDS
CASTING
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
COAL MINING
COPPER ALLOYS
CRYSTAL STRUCTURE
EQUIPMENT
FABRICATION
FRACTURE PROPERTIES
HARDNESS
HEAT TREATMENTS
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE ADDITIONS
MANGANESE ALLOYS
MECHANICAL PROPERTIES
MELTING
METALLOGRAPHY
MICROSTRUCTURE
MINING
PHASE TRANSFORMATIONS
SILICON ADDITIONS
SILICON ALLOYS
STEELS
WEAR RESISTANCE