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Crystallographic preferred orientation near the surface of a roll-forged tapered roller bearing
Abstract
The crystallographic texture of retained austenite and martensite near the surface of experimental case-carburized tapered roller bearing cones was determined in the ‘as produced’ and ‘after service’ conditions (before and after 4 × 108 cycles of rolling contact) using a cobalt x-ray source. A method of background and defocusing correction was developed which accounted extremely well for sample curvature, inexact positioning, and beam intensity which varies with incident beam direction. The texture of the near-surface martensite was determined to contain a combination of sheet textures: {031}⟨213⟩, {121}⟨123⟩, and {311}⟨121⟩ with magnitudes of approximately 1.22 times-random. The near-surface crystallographic texture of the austenite in the ‘as produced’ condition was found to contain multiple sheet textures of {313}⟨132⟩, {123}⟨032⟩, and {123}⟨331⟩ with magnitudes of approximately 1.5 times-random. The subsurface crystallographic texture of the austenite in the ‘after service’ condition was found to be void of the original sheet components and contained only the {100}⟨011⟩ sheet component with a magnitude of 1.65 times-random. The textural components of the ‘as produced’ austenite were determined to have been annihilated by deformation to form the {100}⟨011⟩ texture in austenite and by transformation of the {313}⟨132⟩ and {123}⟨032⟩ textures to martensite.
Subject Area
Metallurgy|Materials science
Recommended Citation
Snyder, Todd Warren, "Crystallographic preferred orientation near the surface of a roll-forged tapered roller bearing" (1999). ETD collection for University of Nebraska-Lincoln. AAI9942154.
https://digitalcommons.unl.edu/dissertations/AAI9942154