High-speed bearing applicable materials

High-speed bearing applicable material material has its unique aspects of high-speed bearing. When the DMN value is small, the damage form of bearing can be surface or subsurface fatigue spalling, and when the DMN value more than 2. 5 million, the further development of fatigue crack layer is, serious when inner ring can fall off into pieces. In response, high toughness, internal surface strength can be used on the surface of hardened steel ring. Typical of this kind of steel products such as AISI8620, CBS600, CBSl000M and VASCOX - 2, etc. High-speed bearing sometimes due to the high temperature itself, or work in high temperature environment, but the requirement is different than the average high temperature conditions. For example,; To work under temperature of 220 ℃ high-speed bearing, but requests the 315 ℃ high temperature material choice, this is because the high-speed bearing requires higher hot hardness, resistance at high speed effect caused by the deformation trend. Commonly used high temperature high-speed bearing steel with M50, M2, WB49 and M315, among them with the method of vacuum induction melting and then use the method of vacuum arc remelting M50 steel, use the method of vacuum induction melting of M50 steel life expectancy increased by more than five times, and widely applied. Although high-speed bearing does not seem directly involves the corrosion problem, but there are quite a few proportion in the high-speed bearing failure due to material corrosion, when meet this kind of problem, can use corrosion resistant alloy, chromium ion injection of M50 steel and silicon nitride ceramic material of bearings. High-speed bearing cage requirements with high strength material, can be used in demanding situation AMS4616 silicon bronze, S - Monel alloy, etc. The most commonly used is iron alloy AISl4340 ( AMS6415) For heat treatment hardness in the range of HRC28 ~ 36. In order to further improve the friction characteristics of cage, often on its surface coated with a layer of 20 to 50 microns of the silver film ( For example AMS2412 and 2410) 。 Ceramic materials in the application in high speed bearing is expected to have larger, the silicon nitride Si3N4 material life expectancy is higher than the M50 steel, while the proportion was only 40% of the steel, have been used to make even ring, roller and confirmed that have excellent corrosion resistant, high speed, high temperature adaptability and only the manufacturing cost is very high.