EP2268841A1 - Composant de palier - Google Patents

Composant de palier

Info

Publication number
EP2268841A1
EP2268841A1 EP09726170A EP09726170A EP2268841A1 EP 2268841 A1 EP2268841 A1 EP 2268841A1 EP 09726170 A EP09726170 A EP 09726170A EP 09726170 A EP09726170 A EP 09726170A EP 2268841 A1 EP2268841 A1 EP 2268841A1
Authority
EP
European Patent Office
Prior art keywords
bearing component
bainite
cobalt
aluminium
chromium
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Withdrawn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
EP09726170A
Other languages
German (de)
English (en)
Inventor
Mohamed Sherif
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.)
SKF AB
Original Assignee
SKF AB
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 SKF AB filed Critical SKF AB
Priority to EP09726170A priority Critical patent/EP2268841A1/fr
Publication of EP2268841A1 publication Critical patent/EP2268841A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
    • 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
    • C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/62—Selection of substances

Definitions

  • the present invention relates generally to the field of metallurgy and to a bearing component such as a rolling element or ring formed from a bearing steel comprising lower bainite as the predominant phase.
  • Rolling element bearings are devices that permit constrained relative motion between two parts.
  • Rolling element bearings comprise inner and outer raceways and a plurality of rolling elements (balls or rollers) disposed therebetween.
  • rolling elements balls or rollers
  • Through-hardened components differ from case-hardened components in that the hardness is uniform or substantially uniform throughout the component. Through-hardened components are also generally cheaper to manufacture than case-hardened components because they avoid the complex heat-treatments associated with carburizing, for example.
  • two heat- treating methods are available: martensite hardening or austempering. Component properties such as toughness, hardness, microstructure, retained austenite content, and dimensional stability are associated with or affected by the particular type of heat treatment employed.
  • the martensite through-hardening process involves austenitising the steel prior to quenching below the martensite start temperature.
  • the steel may then be low- temperature tempered to stabilize the microstructure.
  • the bainite through-hardening process involves austenitising the steel prior to quenching above the martensite start temperature. Following quenching, an isothermal bainite transformation is performed. Bainite through-hardening is sometimes preferred in steels instead of martensite through- hardening. This is because a bainitic structure may possess superior mechanical properties, for example toughness and crack propagation resistance.
  • WO 01/79568 describes a method for the production of a part for a rolling bearing. Summary
  • the present invention provides a bearing component formed from a steel composition comprising:
  • the bearing component is formed from the alloy as herein described and preferably comprises lower bainite as the main phase (typically at least 60% bainite, more typically at least 80% bainite) or as essentially the only phase (i.e. > 95% bainite) .
  • Bainite is preferably obtained by carrying out the transformation at a relatively low temperature, typically less than 350 0 C, more typically from 110 to 325°C.
  • the low transformation temperature is that the plates of bainite are very fine.
  • the material preferably has a microstructure comprising plates of bainite of less than 100 nm, typically from 10 to 50 nm, more typically from 20 to 40 nm.
  • the plates of bainite are typically interspersed with retained austenite.
  • the bainite typically forms at least 60% of the microstructure, more typically at least 80%.
  • the steel is preferably essentially carbide-free.
  • the microstructure will comprises less than 5% carbides, more typically less than 3%.
  • the steel typically has an ultimate tensile strength of 2500 MPa, a hardness at 600-670 HV, and toughness in excess of 30-40 MPam 1/2 .
  • the microstructure and resulting mechanical properties lead to improved rolling contact fatigue performance in the bearing component.
  • the steel composition preferably comprises 0.7 - 1.1 wt . % carbon, more preferably from 0.75 to 1.05 wt . % carbon. In combination with the other alloying elements, this results in the desired fine (lower) bainite microstructure. Carbon acts to lower the bainite transformation temperature.
  • the steel composition preferably comprises 0.25 - 2 wt . % silicon, more preferably from 0.25 - 1 wt . % silicon, still more preferably from 0.4 - 1 wt.% silicon. In combination with the other alloying elements, this results in the desired fine carbide-free microstructure (or essentially carbide-free) . Silicon helps to suppress the precipitation of cementite. However, too high a silicon content may result in undesirable surface oxides and a poor surface finish. For this reason, the maximum silicon content is 2 wt.%, more preferably 1 wt.%.
  • the steel composition preferably comprises 0.25 - 1.9 wt.% manganese, more preferably from 0.25 - 1.8 wt.% manganese, still more preferably from 0.25 - 1.7 wt.% manganese.
  • Manganese acts to increase the stability of austenite relative to ferrite.
  • the steel composition preferably comprises 0.95 to 2.05 wt . % chromium, more preferably from 0.95 - 1.5 wt.% chromium, still more preferably from 0.95 - 1.4 wt.% chromium, still more preferably 0.95 - 1.3 wt.% chromium. Chromium acts to increase hardenability and reduce the bainite start temperature .
  • the steel composition comprises one or both of:
  • the steel composition comprises one or both of:
  • the steel composition comprises one or both of:
  • the steel composition comprises one or both of:
  • Aluminium has been found to improve the intrinsic toughness of the bearing component, possibly due to it suppressing carbide formation.
  • Cobalt has been found to improve the corrosion resistance of the bearing component. This is very important for bearing components for wind turbines or marine pods, for example. Such bearings may become contaminated by sea water, which can drastically reduce the service life of the bearing.
  • the alloy preferably also comprises from 0.05 - 0.5 wt . % molybdenum.
  • Molybdenum acts to avoid austenite grain boundary embrittlement owing to impurities such as, for example, phosphorus. Molybdenum also acts to increase hardenability and reduce the bainite start temperature
  • the steel for use in the bearing component according to the present invention may contain unavoidable impurities, although, in total, these are unlikely to exceed 0.5 wt . % of the composition.
  • the alloys Preferably, contain unavoidable impurities in an amount of not more than 0.3 wt . % of the composition, more preferably not more than 0.1 wt . % of the composition.
  • the phosphorous and sulphur contents are preferably kept to a minimum.
  • the alloys according to the present invention may consist essentially of the recited elements. It will therefore be appreciated that in addition to those elements which are mandatory other non-specified elements may be present in the composition provided that the essential characteristics of the composition are not materially affected by their presence .
  • the bearing component according to the present invention is formed from a steel that transforms to bainite at a temperature of typically 110 to 350 0 C, more typically 115 to 250 0 C.
  • the transformation time for complete bainite formation is typically from 3 hours to 80 days, more typically from 6 hours to 60 days.
  • the transformation time depends on the transformation temperature: the time is longer for lower temperatures.
  • the amount of bainite that is formed depends on the transformation temperature: more bainite is formed at lower temperatures.
  • the amount of retained austenite increases for higher transformation temperatures .
  • the process for the manufacture of the steel for the bearing component avoids rapid cooling so that residual stresses can be avoided in large component pieces.
  • Suitable bainitic steel compositions for use in the present invention include (the balance being Fe) :
  • various mechanical properties can be improved by carrying out any of the conventional post-bainite transformation steps.
  • the yield strength can be improved by carrying out a post-bainite transformation deformation step followed by tempering.
  • the bearing component may be part of a rolling element bearing, for example the bearing inner or outer ring, or the ball or roller element.
  • the bearing component could also be part of a linear bearing such as ball and roller screws.
  • the present invention also provides a bearing comprising a bearing component as herein described.

Landscapes

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

Abstract

La présente invention porte sur un composant de palier formé à partir d'une composition d'acier comprenant : (a) de 0,5 à 1,2 % en poids de carbone, (b) de 0,15 à 2 % en poids de silicium, (c) de 0,25 à 2 % en poids de manganèse, (d) de 0,85 à 3 % en poids de chrome, (e) facultativement un ou plusieurs des éléments suivants : de 0 à 5 % en poids de cobalt, de 0 à 2 % en poids d'aluminium, de 0 à 0,6 % en poids de molybdène, de 0 à 0,5 % en poids de nickel, de 0 à 0,2 % en poids de vanadium, de 0 à 0,1 % en poids de soufre, de 0 à 0,1 % en poids de phosphore et (f) le reste étant du fer, conjointement avec des impuretés inévitables.
EP09726170A 2008-03-25 2009-03-25 Composant de palier Withdrawn EP2268841A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09726170A EP2268841A1 (fr) 2008-03-25 2009-03-25 Composant de palier

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP08251054 2008-03-25
PCT/EP2009/002176 WO2009118166A1 (fr) 2008-03-25 2009-03-25 Composant de palier
EP09726170A EP2268841A1 (fr) 2008-03-25 2009-03-25 Composant de palier

Publications (1)

Publication Number Publication Date
EP2268841A1 true EP2268841A1 (fr) 2011-01-05

Family

ID=40757182

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09726170A Withdrawn EP2268841A1 (fr) 2008-03-25 2009-03-25 Composant de palier

Country Status (4)

Country Link
US (1) US20110052442A1 (fr)
EP (1) EP2268841A1 (fr)
CN (1) CN102046828A (fr)
WO (1) WO2009118166A1 (fr)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2732188A1 (fr) 2008-07-31 2010-02-04 The Secretary Of State For Defence Acier bainitique et ses procedes de fabrication
EP2987873A3 (fr) * 2009-07-22 2016-04-13 NTN Corporation Procédé de traitement thermique d'un élément en forme d'anneau, élément en forme d'anneau et son procédé de production, anneau de palier et son procédé de production, palier de roulement
CN102251197B (zh) * 2010-05-20 2013-01-23 宝山钢铁股份有限公司 一种高碳铬轴承钢及其制造方法
CN103237914A (zh) * 2010-12-13 2013-08-07 Skf公司 用于高温连接工艺的钢和部件
CN103314119B (zh) 2011-01-21 2015-09-02 Ntn株式会社 套圈的制造方法、套圈及滚动轴承
WO2012158089A1 (fr) 2011-05-17 2012-11-22 Aktiebolaget Skf Acier à roulement amélioré
CN102268601B (zh) * 2011-08-09 2013-02-20 上海捷如重工机电设备有限公司 50Cr3MoV支承辊用钢和热处理方法
WO2013060866A1 (fr) * 2011-10-28 2013-05-02 Aktiebolaget Skf Composant porteur
DE102012204618A1 (de) * 2012-03-22 2013-09-26 Schaeffler Technologies AG & Co. KG Wälzlager mit einem Lagerring mit gehärteter Randzone
DE102012017143B3 (de) * 2012-08-30 2014-03-27 Technische Universität Clausthal Verfahren zum Herstellen eines Bauteils mit bainitischem Gefüge und entsprechendes Bauteil
CN102953006B (zh) * 2012-10-19 2014-08-06 燕山大学 整体硬贝氏体轴承钢及其制造方法
WO2015113574A1 (fr) * 2014-01-29 2015-08-06 Aktiebolaget Skf Alliage d'acier
RU2578873C1 (ru) * 2014-11-25 2016-03-27 федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Пермский национальный исследовательский политехнический университет" Сталь с бейнитной структурой
GB2532761A (en) * 2014-11-27 2016-06-01 Skf Ab Bearing steel
GB201421047D0 (en) * 2014-11-27 2015-01-14 Skf Ab Bearing steel
GB2535782A (en) * 2015-02-27 2016-08-31 Skf Ab Bearing Steel
DE102016208682A1 (de) * 2015-05-25 2016-12-15 Aktiebolaget Skf Methode zur Verbesserung der Struktur einer Stahlkomponente nach einem Erhitzen und Stahlkomponente, die durch die Methode erlangt wird
GB201521947D0 (en) * 2015-12-14 2016-01-27 Skf Ab Bearing steel
CN105387073A (zh) * 2015-12-30 2016-03-09 哈尔滨工业大学 一种带有耐高温固定架的钴系钢圆锥滚子轴承
CN105908075A (zh) * 2016-05-31 2016-08-31 安徽潜山轴承制造有限公司 一种合金钢轴承座的铸造工艺
DE102016223680A1 (de) * 2016-11-29 2018-05-30 Schaeffler Technologies AG & Co. KG Verfahren zur Herstellung eines Wälzlagerbauteils
CN108061097A (zh) * 2017-12-14 2018-05-22 昆山拓可机械有限公司 一种无铅滑动轴瓦及生产工艺
CN110029272B (zh) * 2019-04-17 2020-07-03 燕山大学 高韧性轴承的组织调控方法及纳米贝氏体轴承用钢
KR102239184B1 (ko) * 2019-09-04 2021-04-12 주식회사 포스코 강도 및 저온 충격인성이 우수한 강재 및 이의 제조방법
DE102020202739A1 (de) 2020-03-04 2021-09-09 Mahle International Gmbh Gesintertes Lagerbuchsenmaterial, Gleitlager, Brennkraftmaschine und elektrische Maschine
CN111763889A (zh) * 2020-06-02 2020-10-13 钢铁研究总院 一种高碳轴承钢及其制备方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2352726A (en) 1999-08-04 2001-02-07 Secr Defence A steel and a heat treatment for steels

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2639985A (en) * 1951-04-30 1953-05-26 United States Steel Corp Bearing and steel therefor
US4992111A (en) * 1988-08-15 1991-02-12 N.T.N. Corporation Bearing race member and method of fabrication
JPH0633190A (ja) * 1992-07-14 1994-02-08 Sumitomo Metal Ind Ltd 長寿命軸受用鋼
JPH06271982A (ja) * 1993-03-23 1994-09-27 Kawasaki Steel Corp 繰り返し応力負荷によるミクロ組織変化の遅延特性に優れた軸受鋼
JPH06293939A (ja) * 1993-04-07 1994-10-21 Kobe Steel Ltd 高温転動疲労性に優れた軸受部品
JPH07252595A (ja) * 1994-03-11 1995-10-03 Kawasaki Steel Corp 繰り返し応力負荷によるミクロ組織変化の遅延特性に優れた軸受部材
JP3243366B2 (ja) * 1994-04-20 2002-01-07 川崎製鉄株式会社 繰り返し応力負荷によるミクロ組織変化の遅延特性に優れた軸受部材
JPH1030150A (ja) * 1996-07-19 1998-02-03 Nippon Seiko Kk 転がり軸受
JP3687275B2 (ja) * 1997-05-19 2005-08-24 大同特殊鋼株式会社 高周波輪郭焼入用非調質鋼
US6224688B1 (en) * 1997-08-18 2001-05-01 Nsk Ltd. Rolling bearing
NL1011807C2 (nl) * 1999-04-15 2001-02-05 Skf Engineering & Res Services Machinestaal en onderdeel van een wentellager.
NL1011806C2 (nl) * 1999-04-15 2000-10-17 Skf Engineering & Res Services Kogellagerstaal met een oppervlak met een onderbainitische structuur en een werkwijze voor het vervaardigen daarvan.
JP3997662B2 (ja) * 1999-08-09 2007-10-24 株式会社ジェイテクト 転がり軸受
WO2005106059A1 (fr) * 2004-04-28 2005-11-10 Jfe Steel Corporation Éléments pour construction de machine et procédé de production de ceux-ci
JP5344454B2 (ja) * 2005-11-21 2013-11-20 独立行政法人物質・材料研究機構 温間加工用鋼、その鋼を用いた温間加工方法、およびそれにより得られる鋼材ならびに鋼部品

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2352726A (en) 1999-08-04 2001-02-07 Secr Defence A steel and a heat treatment for steels

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"Cobalt", HUMAN HEALTH FACT SHEET - ARGONNE NATIONAL LABORATORY EVS, August 2005 (2005-08-01), pages 1 - 2, XP003028348
BROWN P.M. AND BAXTER D.P.: "Hyper-strength bainitic steels", AIST PROCESS METALLURGY, PRODUCT QUALITY AND APPLICATIONS PROCEEDINGS. MATERIALSSCIENCE AND TECHNOLOGY CONFERENCE, 26 September 2004 (2004-09-26), pages 433 - 436, XP009130518
See also references of WO2009118166A1

Also Published As

Publication number Publication date
CN102046828A (zh) 2011-05-04
WO2009118166A1 (fr) 2009-10-01
US20110052442A1 (en) 2011-03-03

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