Title:
METHOD FOR AUSTEMPERING STEEL PARTS
Document Type and Number:
WIPO Patent Application WO2001049888
Kind Code:
A9
Abstract:
The invention relates to a method for austempering steel parts according to which the steel parts are firstly austenitized and are subsequently quenched to a starting temperature (T2) which is higher than the martensite starting temperature (TM) of the steel parts. Afterwards, a first isothermal storage of the steel parts is firstly carried out at starting temperature (T2) and over a first period ( DELTA tiso, 1). A second isothermal storage of the steel parts is then carried out over a second period ( DELTA tiso, 2) and at a finishing temperature (T3) that is higher than the starting temperature (T2). The inventive method is especially suited for rapidly austempering steel parts which makes it possible to obtain a pure bainite structure and to adjust the core hardness of the obtained steel parts by altering the starting temperature (T2), the finishing temperature (T3), the duration of the first period ( DELTA tiso, 1) and the duration of the second period ( DELTA tiso, 2).
Inventors:
FOERSTER LOTHAR (DE)
MICHALSKI MICHAEL (DE)
BECHT ANDREAS (DE)
ENGLERT KARL-OTTO (DE)
CZERINGER MICHAEL (DE)
MICHALSKI MICHAEL (DE)
BECHT ANDREAS (DE)
ENGLERT KARL-OTTO (DE)
CZERINGER MICHAEL (DE)
Application Number:
PCT/DE2000/003668
Publication Date:
June 05, 2003
Filing Date:
October 18, 2000
Export Citation:
Assignee:
BOSCH GMBH ROBERT (DE)
FOERSTER LOTHAR (DE)
MICHALSKI MICHAEL (DE)
BECHT ANDREAS (DE)
ENGLERT KARL-OTTO (DE)
CZERINGER MICHAEL (DE)
FOERSTER LOTHAR (DE)
MICHALSKI MICHAEL (DE)
BECHT ANDREAS (DE)
ENGLERT KARL-OTTO (DE)
CZERINGER MICHAEL (DE)
International Classes:
C21D1/20; C21D6/00; (IPC1-7): C21D1/20
Download PDF:
Previous Patent: METHOD FOR WORKING STEEL
Next Patent: METHOD FOR THE PRODUCTION OF BLISTER COPPER IN SUSPENSION REACTOR
Next Patent: METHOD FOR THE PRODUCTION OF BLISTER COPPER IN SUSPENSION REACTOR