STP1419

    Wear and Corrosion Resistant PM Tool Steels for Advanced Bearing Applications

    Published: Jan 2002


      Format Pages Price  
    PDF Version (380K) 13 $25   ADD TO CART
    Complete Source PDF (13M) 13 $143   ADD TO CART


    Abstract

    Candidate materials for the hardened steel raceways in ceramic-ball hybrid bearings, as well as steel components for other advanced bearing designs, are being increasingly specified to be capable of attaining combinations of material properties that have not previously been required of traditional bearing steels such as 52100, M50, and 440C. The desired properties may include one or more of the following: greater attainable hardness for higher static load capacity, good hot hardness and material stability at elevated operating temperatures, better adhesive and abrasive wear resistance to minimize galling or raceway damage under contaminated running conditions, good corrosion resistance for bearings which may be exposed to corrosive operating or storage environments, adequate shock loading survivability for potential satellite launching, and of course good fatigue life characteristics.

    A number of recent bearing industry publications have discussed some of the properties and laboratory bearing test results for CPM® VIM CRU® 20™3, which is a cobalt-free high-carbide-volume PM high speed steel with 66 HRC minimum attainable hardness capability and good hot hardness characteristics. Although this material remains one of the leading candidates for the hardened steel raceways in several of the hybrid bearing designs developed to date, it has low chromium content and therefore inadequate corrosion resistance for the operating conditions or storage environments anticipated for other bearing applications.

    This paper discusses the potential application of more recently developed high-chromium and high-vanadium PM tool steels for advanced bearing designs where the alloying has been designed to achieve a unique combination of corrosion resistance, high attainable hardness, and exceptional wear resistance.

    Keywords:

    PM, particle metallurgy, tool steel, bearing steel, corrosion resistanc, wear resistance, impact toughness, bend fracture strength


    Author Information:

    Kajinic, A
    Research Engineer and President, Crucible Research Division, Pittsburgh, PA

    Dixon, RB
    Research Engineer and President, Crucible Research Division, Pittsburgh, PA

    Hann, BA
    Process Engineer, Crucible Compaction Metals Division, Oakdale, PA


    Paper ID: STP10865S

    Committee/Subcommittee: A01.28

    DOI: 10.1520/STP10865S


    CrossRef ASTM International is a member of CrossRef.