METHOD OF PRODUCING LARGE COMPONENT FROM AUSTEMPERED DUCTILE IRON ALLOY

PROBLEM TO BE SOLVED: To provide a method by which properties of a component formed of a ductile iron alloy and having thick sections can be promoted with an austempering process.SOLUTION: In the method, when casting the ductile iron alloy 24 containing Fe, C, Si and alloying constituents, the casti...

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Hauptverfasser:	PAROLINI JASON ROBERT, THOMASON SCOTT DENTON, THANGIRALA SUBRAHMANYAM, BOUSE GREGORY KEITH, PARK JUNYOUNG
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS BLASTING CASTING CASTING OF METALS CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING LIGHTING MACHINES OR ENGINES FOR LIQUIDS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL ENGINEERING METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS POWDER METALLURGY PRODUCING MECHANICAL POWER REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS WIND MOTORS WIND, SPRING WEIGHT AND MISCELLANEOUS MOTORS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method by which properties of a component formed of a ductile iron alloy and having thick sections can be promoted with an austempering process.SOLUTION: In the method, when casting the ductile iron alloy 24 containing Fe, C, Si and alloying constituents, the casting is solidified at a rate that inhibits segregation of the alloying 24 constituents to grain boundaries of the casting, and so that the casting contains graphite nodules having a count of greater than 100 nodules per mm. The casting is then austempered by heating to an austenitization temperature to yield a microstructure having a single-phase matrix of austenite that contains carbon, and then quenching the casting to an austempering temperature. The casting is held at the austempering temperature for a duration sufficient to yield a microstructure whose matrix is mostly ausferrite and essentially free of martensite and pearlite.