A Low Density Steel for Bearings

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A Low Density Steel for Bearings
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Low-density bearing steel: APMS conference
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A lecture given by Hongliang Yi, at the Adventures in the Physical Metallurgy of Steels (APMS) conference held in Cambridge University. The talk is about low-density steel destined for bearing applications. Both rolling contact fatigue properties and wear resistance get improved with the increase of hardness for bearings. Large carbon content can achieve high hardness by solid solution strengthening in martensite or dispersion hardening due to carbide precipitation. Carbon decreases the martensite starting temperature and therefore increases the volume fraction of untransformed austenite that is not desired in the point view of dimensional stability since the metastable austenite could be induced to transform into martensite during service, furthermore the soft retained austenite would deteriorate the overall hardness. A novel alloy design has been proposed by high aluminium addition into the classical 52100 bearing steel to achieve the following advantages. Aluminium addition decreases the density of the steel significantly, whilst it enlarges the carbon solubility in austenite by thermodynamics and therefore more carbon is permitted to be added in this new low density bearing steel to maintain or enhance the hardness compared with conventional 52100 bearing steel. In order to validate the proposed speculation, some preliminary investigation on the designed alloy with high carbon (1.2 wt%) and high aluminium(5 wt%) will be conducted in this research, which is approximate 8 wt% lighter than the conventional 52100 alloy.
Porcelain Steel Rolling (metalworking) Key (engineering) Rolling (metalworking)
Spare part Hose coupling Bill of materials
Seeschiff Widerstandsschweißen Widerstandsschweißen Steel Reibermüdung Rolling (metalworking)
Widerstandsschweißen Steel Cartridge (firearms) Rolling (metalworking) Reibermüdung
Lagerstahl Cartridge (firearms) Hose coupling
Cartridge (firearms) Chemical substance
Lagerstahl Pelzware
Fulling North American B-25 Mitchell Steel Cartridge (firearms) Pelzware
Steel Lagerstahl Ford Transit Car dealership
Cartridge (firearms) Material
Cartridge (firearms) Shot peening Hose coupling
Cartridge (firearms) Firearm Hot isostatic pressing
Typesetting Cupboard
Cartridge (firearms)
Outsourcing Cartridge (firearms)
Cartridge (firearms) Mixing (process engineering)
Airbus A300 Pattern (sewing) Cartridge (firearms)
Photocopier Steel Spaceflight
Book cover Spaceflight Internal combustion engine Water vapor
Alcohol proof
Tool Side Impact Protection System
Spare part Stationery Wind wave Northrop Grumman B-2 Spirit
Gentleman Cartridge (firearms) Alcohol proof Shot peening Musical ensemble Internal combustion engine Assault rifle
Steel Material Hot isostatic pressing
Hose coupling
Screwdriver Ford Transit Lapping Model building Pelzware
Typesetting Kopfstütze
Typesetting Steel Ford Transit Casting defect Material Chemical substance Bill of materials
Hot working Steel Hüttenindustrie Stagecoach Pressure regulator Cardboard (paper product) Fulling Cartridge (firearms) Ship naming and launching Photographic processing Endeavour (yacht) Model building Progressive lens
Cartridge (firearms) Alcohol proof
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