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1. (US20060060268) Method of making high strength bainite article, and article made thereby

Office : United States of America
Application Number: 11227354 Application Date: 15.09.2005
Publication Number: 20060060268 Publication Date: 23.03.2006
Publication Kind : A1
IPC:
C21D 1/18
C21D 1/20
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
1
General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering
18
Hardening; Quenching with or without subsequent tempering
C CHEMISTRY; METALLURGY
21
METALLURGY OF IRON
D
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
1
General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering
18
Hardening; Quenching with or without subsequent tempering
19
by interrupted quenching
20
Isothermal quenching, e.g. bainitic hardening
Applicants: MACHROWICZ TAD
LANDINO BRANDON
Inventors: Machrowicz Tad
Landino Brandon
Agents: GIFFORD, KRASS, GROH, SPRINKLE & CITKOWSKI, P.C
Priority Data: 60610720 17.09.2004 US
Title: (EN) Method of making high strength bainite article, and article made thereby
Abstract: front page image
(EN)

A bainite phase is formed in a body of a ferrous alloy by heating the workpiece to a temperature above an austenizing temperature of the alloy and thereafter contacting the workpiece with a quenching medium. Heat is input to the workpiece during at least a portion of the time it is in contact with the quenching medium. The quenching medium and/or the source of heat are regulated so that they work in combination to maintain the workpiece at a holding temperature which is no more than 350° C. but above the temperature at which the martensite phase forms in the alloy. After maintaining the alloy at the holding temperature for a predetermined period of time, it is cooled to ambient. Also disclosed are systems for implementing the method.


Also published as:
KR1020070099539EP1797205JP2008519154US20060060570US20080053579CN101365399
WO/2007/001374