X-Ray Texture Analysis on Cyclic Shearring Deformation due to Rolling Contact Fatigue
Kenji KASHIWAYA and Yukio SATOH
Abstract:Shearing deformation due to high cyclic rolling contact fatigue formes a unique texture below the contact surface. It is measured by means of X-ray diffraction and expresses as a pole figure. The pole figure shows a pattern which looks like that of a single crystal. That results from the deformation under the rule of the crystallographic easy slip plane/direction. Rolling contact fatigue tests with a pair of cylindrical test pieces made of cobalt, pearlitic steel and iron are performed in order to clarify the shearing plane/direction experimentally for development of the contact mechanics. The test pieces made of cobalt whose crystal structure is h.c.p. and whose crystallograpfic easy slip plane is only the bottom plane (0001) are used for determination of the shearing plane. The pole figure of the pearlitic steel reveals that the ferrite layer sandwiched between@cementite plates in pearlite deforms as a result of a crystal easy slip ƒ¿Fe{211}<111> and that the shearing direction is the rolling direction on the shearing plane mentioned above. Furthermore, the shearing deformation of iron as a result of crystal easy slips (110)[111] and (110)[111] is clarified by the X-ray texture analysis. Key Words:X-ray diffraction, Texture, Rolling contact fatigue, Shearing deformation, Crystal slip plane/direction, Contact mechanics