High-speed bearings suitable materials
    High-speed bearing timber has its unique aspects . When dmn value is small , can destroy forms bearing surface or subsurface fatigue spalling , and when the value of more than 2.5 million dmn , fatigue cracks will develop in depth layer , the inner will to block severe spalling . In this regard, the surface can be high strength, high toughness inside surface hardened steel ferrule . Typical of such steels such as AISI8620, CBS600, CBSl000M and VASCOX-2 and so on .
    Sometimes because of their high-speed bearings , high temperature, or in high temperature environments , but lower than the general requirements of high temperature conditions vary. For example , ; temperature of the high speed bearings 220 ℃ under working , but requires at 315 ℃ High temperature materials , because high-speed bearings require a higher temperature hardness , tendency to resist deformation at high speed caused by the effect . Used under high temperature and high bearing steel has M50, M2, WB49 and M315 , of which method to use vacuum induction melting followed by vacuum arc remelting method M50 steel than simply using vacuum induction melting method M50 steel life expectancy has increased more than five -fold therefore used more often.
    Although not directly involved in high-speed bearings seem to corrosion problems , but there are quite a few high-speed bearings proportion of corrosion due to material failure in the face of such problems can be corrosion-resistant alloys , steel and silicon nitride ceramic injection M50 chromium ions and other materials for bearings .
    High-speed bearing retainer for high strength materials used in situations that require high silicon bronze can be AMS 4616 , S- Monel alloy. The most common is the use of iron-based alloy AISl4340 (AMS6415), requires heat treatment in the range of hardness of HRC28 ~ 36 . In order to further improve the friction characteristics of the cage , which is usually also plated on silver film layer 20-50μm (eg AMS2412 and 2410 ) .     Ceramic materials in the high-speed bearing is expected to have greater prospects , wherein the silicon nitride Si3N4 materials life higher than M50 steel , and its proportion is only 40% of the steel has been used to manufacture or rolling the rings, and proved to have excellent speed, adaptability and high temperature corrosion resistance , but the current high manufacturing costs .
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