EP3060688A1 - Procédé thermique et dispositif pour augmenter localement la solidité de la couche marginale d'un élément structural à paroi épaisse - Google Patents

Procédé thermique et dispositif pour augmenter localement la solidité de la couche marginale d'un élément structural à paroi épaisse

Info

Publication number
EP3060688A1
EP3060688A1 EP14789199.8A EP14789199A EP3060688A1 EP 3060688 A1 EP3060688 A1 EP 3060688A1 EP 14789199 A EP14789199 A EP 14789199A EP 3060688 A1 EP3060688 A1 EP 3060688A1
Authority
EP
European Patent Office
Prior art keywords
component
quenching
temperature
internal geometry
region
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Withdrawn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
EP14789199.8A
Other languages
German (de)
English (en)
Inventor
Elisabeth Herz
Thomas Krug
Jochen Schwarzer
Juergen Hoffmeister
Hermann Autenrieth
Volker Schulze
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3060688A1 publication Critical patent/EP3060688A1/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Withdrawn legal-status Critical Current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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/14—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes
    • 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
    • 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
    • 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
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • 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
    • C21D2221/00—Treating localised areas of an article
    • C21D2221/10—Differential treatment of inner with respect to outer regions, e.g. core and periphery, respectively
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes

Definitions

  • the present invention relates to a thermal process for local
  • the invention also relates to a device for carrying out such a method.
  • Injection systems and hydraulic components are made of steel components that are subjected to high pressure locally. This concerns in particular the internal geometry of such components, such as
  • Randetzverfestr inside pressure-loaded components is the autofrettage, in which once before the beginning of the operating load a far above the subsequent operating pressure lying Recktik is applied. Due to the
  • the present invention is directed to a thermal process for locally increasing the strength in the area of the internal geometry of a component, in order to introduce life-prolonging compressive residual stresses therein.
  • the prerequisite for this is that the internal geometry
  • the invention includes the technical teaching that the following method steps are carried out for producing a surface-layer-solidified component: Heating the entire component (1) to a temperature of
  • the thermal process according to the invention additionally the microstructural properties of the component can be set locally by heat treatment targeted by a local martensitic curing is performed. Furthermore, the system pressure of the medium compared to the autofrettage can be set lower, which leads to a reduction of the sealing requirements and a lower tool wear.
  • the inventive method is based in principle on each regulated separate cooling of the boundary layer and
  • the local quenching of the component is in the range of
  • quenching agent is preferably a water-air mixture is used.
  • a pure gas quenching which is particularly suitable for components with low material thicknesses.
  • oils or saline media with different temperature control.
  • inventive method can be carried out within a single device.
  • Such a device preferably consists essentially of a heating unit for heating the entire component to the above-mentioned temperature in the range between 820-1050 ° C.
  • a heating unit can be designed, for example, as an inductive heating unit. However, it is also conceivable to conduct a conductive heating or heating by thermal radiation in an oven.
  • the device comprises a quenching unit for supplying the quenching agent for the local quenching in the region of the internal geometry of the component to the specified temperature between 150 to 450 ° C.
  • Quenching unit is preferably arranged locally above the component and connected to one side of the continuous internal geometry, for example a bore.
  • the quenching agent can thus pass from there the inner geometry and leave the component at the other end of the passage again. There are therefore several in the case of bore intersections
  • the quenching unit providing the quenching means may be equipped with a cooling device.
  • the device may further comprise a pumping device to supply the quenching agent to the continuous internal geometry of the component.
  • a pumping device to supply the quenching agent to the continuous internal geometry of the component.
  • At least one temperature sensor is provided, which arranged at least on the outer lateral surface, detects the prevailing temperature there. Since it is possible to perform the quenching process with a tempered quenching agent, the measurement in the range of
  • the inventive method can also be used as a purely controlled Process be performed. Instead of continuously lowering the temperature at the surface layer, it can also be kept isothermal.
  • the inventive method is transferable to a wide range of materials.
  • the material 50CrMo4 is used, in which a significant local increase in the strength of the edge layer in geometry can be achieved with the method according to the invention.
  • the prerequisite is always a structural transformation and a sufficiently sluggish bainitic transformation behavior of the material.
  • Figure 1 is a schematic representation of a device for local
  • Figure 3 is a graphical representation of the temperature-time course in the implementation of the invention
  • the device for locally increasing the strength of a continuous internal geometry 2 in the form of a through bore in a component 1 formed as a cylindrical sleeve consists of an inductive heating unit 3 surrounding the component 1, which heats the component 1 to the starting temperature in the region between 820 serves up to 1050 ° C.
  • the component 1 is constructed with a wall thickness of several millimeters quite thick-walled and consists of a martensitic curable
  • a quenching unit 4 for supplying a
  • Quenching agent arranged in the form of a water-air mixture. While the temperature of the quenching agent is known and at least the
  • the temperature of the component 1 is determined in the outer jacket region by a temperature sensor 5 arranged there.
  • the temperature sensor 5 is provided in an electronic control unit (not shown) for controlling a slow cooling of the component 1 from internal geometry, through which the quenchant flows, to the outer jacket area, after initially by supplying the
  • the parameters temperature of the quenching agent, temperature of the component and its geometric dimensions are essential for controlling the
  • Another parameter is the flow velocity of the
  • Quenching agent through the internal geometry 2 of the component 1, which is controlled by a pump 7 integrated in the quenching unit 4.
  • a pump 7 integrated in the quenching unit 4.
  • the quenching agent arrives at the component 1. An on the
  • Quenching unit 4 on the outlet side arranged valve 9 is provided for the connection and disconnection of the coolant flow and is electromagnetically controlled via the electronic control unit to the flow of the
  • the component 1 shown here in partial section has a solidified edge layer P1 after the thermal treatment
  • martensitic steel in the area of the internal geometry 2 and over an outer shell region P2 of bainitic to martensitic steel.
  • the component is first during the thermal process for local increase in consolidation heated to 820-1050 ° C. After this temperature has been reached constant, ie, the component has been thoroughly warmed, local quenching takes place in the region of the internal geometry of the component by rapid quenching of the temperature to 150 to 450 ° C. in the peripheral layer P1 of the internal geometry through the quenching agent flowing therethrough. In contrast, the jacket region P2 is cooled more slowly with a temperature gradient of 1 to 100 ° C per second. This results in a contrast solidified edge layer PL Subsequently, the component is cooled to room temperature.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

L'invention concerne un procédé thermique et un dispositif pour augmenter localement la solidité de la couche marginale (P1) d'une géométrie intérieure (2) traversante, soumise à de fortes pressions, d'un élément structural (1) à paroi épaisse à base d'un matériau acier pouvant être trempé pour former de l'acier martensitique, ledit procédé comprenant les étapes suivantes : porter l'ensemble de l'élément structural (1) à une température de l'ordre de 820 à 1050°C, effectuer une trempe locale dans la zone de la géométrie intérieure (2) de l'élément structural pour parvenir à une température de l'ordre de 150 à 450, refroidir lentement l'élément structural (1), de la zone de la géométrie intérieure (2) à la zone d'enveloppe (P2) extérieure, avec un gradient de température allant de 1 à 100°C par seconde, jusqu'à obtention d'un équilibre des températures, puis effectuer une trempe finale dudit élément structural (1) pour parvenir à température ambiante.
EP14789199.8A 2013-10-22 2014-10-10 Procédé thermique et dispositif pour augmenter localement la solidité de la couche marginale d'un élément structural à paroi épaisse Withdrawn EP3060688A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310221397 DE102013221397A1 (de) 2013-10-22 2013-10-22 Thermisches Verfahren und Vorrichtung zur lokalen Festigkeitssteigerung der Randschicht bei einem dickwandigen Bauteil
PCT/EP2014/071760 WO2015058977A1 (fr) 2013-10-22 2014-10-10 Procédé thermique et dispositif pour augmenter localement la solidité de la couche marginale d'un élément structural à paroi épaisse

Publications (1)

Publication Number Publication Date
EP3060688A1 true EP3060688A1 (fr) 2016-08-31

Family

ID=51794851

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14789199.8A Withdrawn EP3060688A1 (fr) 2013-10-22 2014-10-10 Procédé thermique et dispositif pour augmenter localement la solidité de la couche marginale d'un élément structural à paroi épaisse

Country Status (4)

Country Link
EP (1) EP3060688A1 (fr)
CN (1) CN105658823B (fr)
DE (1) DE102013221397A1 (fr)
WO (1) WO2015058977A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ308471B6 (cs) * 2019-08-19 2020-09-02 Západočeská Univerzita V Plzni Způsob výroby ocelových dílů z AHS oceli řízeným lokálním ochlazováním médiem, využívající tvorbu vícefázové struktury s přerušovaným chlazením na požadované teplotě
CN110912362B (zh) * 2019-11-13 2021-06-22 南京航空航天大学 一种双性能磁阻电机高速转子铁芯热处理装置及方法
DE102022204920A1 (de) 2022-05-18 2023-11-23 Volkswagen Aktiengesellschaft Verfahren und Vorrichtung zum Abschreckhärten von Bauteilen mit Durchgangsöffnung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE918641C (de) * 1950-12-06 1954-09-30 Basf Ag Verguetungsverfahren fuer lange Rohre, insbesondere fuer hohe Drucke
DE1608329B2 (de) * 1968-03-14 1973-04-12 Vorrichtung fuer die induktionshaertung von mit axialbohrung versehenen stahlwalzen
JP3851488B2 (ja) * 2000-04-25 2006-11-29 高周波熱錬株式会社 誘導加熱による中空円筒部材の外面焼入治具
CN2883394Y (zh) * 2006-04-07 2007-03-28 张光荣 柱状内孔圈套类零件的淬火装置
DE102006047929A1 (de) * 2006-10-10 2008-04-17 Robert Bosch Gmbh Verfahren zur Wärmebehandlung
AU2009218189B2 (en) * 2008-02-27 2014-05-22 Nippon Steel Corporation Cooling system and cooling method of rolling steel
US9085811B2 (en) * 2010-04-09 2015-07-21 Hitachi-Ge Nuclear Energy, Ltd. Method for improving residual stress in pipe and method for construction management

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2015058977A1 *

Also Published As

Publication number Publication date
DE102013221397A1 (de) 2015-04-23
CN105658823A (zh) 2016-06-08
WO2015058977A1 (fr) 2015-04-30
CN105658823B (zh) 2018-10-09

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