There is a continuing requirement for improved bearing performance for both commercial and military applications. Service temperatures are increasing steadily due to increased power requirements and corrosion of components remains a major concern as well, particularly for bearings in military systems. In our ongoing study, a number of different coatings were applied to VIM–VAR M50 bearing steel to improve both corrosion resistance and rolling contact fatigue behaviour. This report deals with coatings from the ion beam assisted deposition (I BAD) of TiN, details of the coating process, and test results obtained. The rolling contact fatigue performance of IBAD TiN coated M50 samples, measured with a ball/rod tester at a contact Hertzian stress of 5420 MN m-2, is discussed. Preliminary data on corrosion properties are also presented.
This work represents one phase of a comprehensive gear and bearing materials programme, involving both substrates and coatings. The programme is directed at enhancing both the performance and durability of gears and bearings for insertion into military systems. This paper deals specifically with the Pyrowear 675 alloy, a carburising stainless steel recently developed by Carpenter Technology Corp. The rolling contact fatigue (RCF) performance of steel specimens with four different heat treatments is presented. The optimum heat treatment produced a fivefold increase in both B10 and B50 lifetimes compared with M50 steel, the standard turbine engine bearing steel. Thus, the improved RCF performance combined with good corrosion resistance make Pyrowear 675 alloy an attractive candidate for advanced bearing applications.
The Jarrell-Ash-Lang goniometer (manufactured by Picker X-Ray since 1970) is equipped with a Schneeberger stage to provide the accurate translational motion necessary for x-ray topographs. The commercial model produces striations on the topographs perpendicular to the scanning direction. These are caused by a torque exerted on the stage by the drive mechanism. This difficulty has been remedied by design changes.
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