EP0095470A1 - Procede pour le durcissement bainitique au moins partiel de facon isothermique d'une piece en fonte - Google Patents

Procede pour le durcissement bainitique au moins partiel de facon isothermique d'une piece en fonte

Info

Publication number
EP0095470A1
EP0095470A1 EP82903445A EP82903445A EP0095470A1 EP 0095470 A1 EP0095470 A1 EP 0095470A1 EP 82903445 A EP82903445 A EP 82903445A EP 82903445 A EP82903445 A EP 82903445A EP 0095470 A1 EP0095470 A1 EP 0095470A1
Authority
EP
European Patent Office
Prior art keywords
bath
temperature
cooling
intercooling
workpiece
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP82903445A
Other languages
German (de)
English (en)
Inventor
Wilhelm Hauke
Klaus Hornung
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Georg Fischer AG
Original Assignee
Georg Fischer AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Georg Fischer AG filed Critical Georg Fischer AG
Publication of EP0095470A1 publication Critical patent/EP0095470A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D5/00—Heat treatments of cast-iron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening

Definitions

  • the present invention relates to a method for at least partially, isothermally bainizing workpieces made of cast iron materials / and to its use for workpieces which would be produced in a fully pearlitic manner due to their insufficient cooling speed over the cross section.
  • the hitherto known bainite tempering methods are based on a critical cooling speed which results from the temperature gradient between the austenitizing and cooling bath and the workpiece diameter.
  • the temperature of the intercooling bath is adapted to the relevant wall thickness of the workpiece.
  • the cooling rates can be controlled so that even thicker wall thicknesses do not undergo pearlite transformation, at least in the peripheral zones.
  • a component with a wall thickness of approx. 30 mm made of unalloyed GGG was austenitized at approx. 900 C and then quenched in an intermediate cooling bath at 240 C. The component is then placed on a
  • HHaalltteetteemmppeerraattuu r transferred from 380 C and bainite hardened.
  • the desired bainitic structure with the known advantageous mechanical properties results at least partially over the cross section of the workpiece.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

Le procédé pour le durcissement bainitique au moins partiel de façon isothermique d'une pièce en fonte est particulièrement adapté au traitement de pièces métalliques à parois épaisses. Les pièces après un traitement austénitique sont refroidies dans un bain intermédiaire et finalement soumises à une température de durcissement bainitique jusqu'à ce que le résultat recherché soit obtenu.
EP82903445A 1981-12-03 1982-12-02 Procede pour le durcissement bainitique au moins partiel de facon isothermique d'une piece en fonte Withdrawn EP0095470A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7726/81A CH648350A5 (de) 1981-12-03 1981-12-03 Verfahren zum isothermen bainitisieren von werkstuecken aus eisenwerkstoffen.
CH7726/81 1981-12-03

Publications (1)

Publication Number Publication Date
EP0095470A1 true EP0095470A1 (fr) 1983-12-07

Family

ID=4329552

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82903445A Withdrawn EP0095470A1 (fr) 1981-12-03 1982-12-02 Procede pour le durcissement bainitique au moins partiel de facon isothermique d'une piece en fonte

Country Status (6)

Country Link
EP (1) EP0095470A1 (fr)
BR (1) BR8208004A (fr)
CA (1) CA1210672A (fr)
CH (1) CH648350A5 (fr)
IT (1) IT1153659B (fr)
WO (1) WO1983001959A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2590508B1 (fr) * 1985-11-27 1988-06-24 Pont A Mousson Procede d'obtention de pieces moulees en fonte a graphite spheroidal et fonte obtenue par ce procede
IT1216347B (it) * 1986-11-20 1990-02-22 Necchi Spa Procedimento per ottenere getti in ghisa sferoidale bainitica
FR2697535B1 (fr) * 1992-11-02 1995-01-13 Schissler Jean Marie Procédé amélioré de traitement thermique d'alliages ferreux ou non-ferreux, et son application à l'élaboration de fonte bainitique.
DE4313569C1 (de) * 1993-04-26 1994-05-26 Daimler Benz Ag Verfahren zum Härten von Kugelgraphitgußeisenteilen
SE510344C2 (sv) * 1997-08-01 1999-05-17 Ovako Steel Ab Sätt för fullständig bainithärdning av stål
DE102006059050A1 (de) * 2006-12-14 2008-06-19 Schaeffler Kg Verfahren zur Wärmebehandlung von Wälzlagerbauteilen aus durchgehärtetem, bainitischem Wälzlagerstahl
CN104294014B (zh) * 2013-07-18 2016-12-28 首都航天机械公司 中碳硅锰铬镍系低合金钢的贝氏体等温热处理方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB601588A (en) * 1943-07-06 1948-05-10 Charles Greiner Purnell Improvements in and relating to heat treatment of hardenable steel
US2258566A (en) * 1940-07-30 1941-10-07 American Steel & Wire Co Hardenable steel heat treatment
DE872956C (de) * 1943-08-28 1953-04-09 Deutsche Edelstahlwerke Ag Zwischenstufenverguetung von unlegierten und legierten Staehlen
DE2054416C3 (de) * 1970-11-05 1974-09-05 Gesellschaft Zur Foerderung Der Eisenhuettentechnik Mbh, 4000 Duesseldorf Verfahren zur Wärmebehandlung von Vergütungsstählen
US3860457A (en) * 1972-07-12 1975-01-14 Kymin Oy Kymmene Ab A ductile iron and method of making it
US3784416A (en) * 1972-09-29 1974-01-08 Canron Ltd Manufacture of white cast iron
FR2358465A1 (fr) * 1976-07-13 1978-02-10 Bochumer Eisen Heintzmann Procede et dispositif pour fabriquer des segments de profile d'acier utilises pour le soutenement de galeries souterraines
DE2853870A1 (de) * 1978-12-13 1980-07-03 Schmidt Gmbh Karl Gusseisen mit kugelgraphit mit austenitisch-bainitischem mischgefuege

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8301959A1 *

Also Published As

Publication number Publication date
IT8224385A0 (it) 1982-11-23
CA1210672A (fr) 1986-09-02
BR8208004A (pt) 1983-10-18
IT1153659B (it) 1987-01-14
IT8224385A1 (it) 1984-05-23
CH648350A5 (de) 1985-03-15
WO1983001959A1 (fr) 1983-06-09

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19830715

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB LI NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19850719

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HAUKE, WILHELM

Inventor name: HORNUNG, KLAUS