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Elastic Anisotrophy and Residual Stress in Textured Production Electrolytic Chromium Coatings on Steel

Published online by Cambridge University Press:  06 March 2019

S. L. Lee
Affiliation:
U. S. Army Armament Research Development and Engineering Center Benet Laboratories Waterliet, NY 12189-4050
G. P. Capsimalis
Affiliation:
U. S. Army Armament Research Development and Engineering Center Benet Laboratories Waterliet, NY 12189-4050
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Abstract

Production electrolytic chromium coatings suffer from cracks, which result from high internal stresses generated during the electrolytic crystallization process. This paper characterizes the anisotropy, texture and residual stress state in high contraction chromium coatings on steel-Strong <111> fiber texture, almost perfect in-plane azimuthal symmetry, and high surface residual stresses were observed. Anisotropy factor and aggregate elastic moduli were calculated from single crystal elastic constants. A matrix inversion method was developed to solve for biaxial residual stress and unstrained lattice parameter in textured chromium coatings. Assuming an isotropic elastic Hill-Neerfeld model, residual stress was also evaluated using the sin2ψ method adapted to multiple families of reflections.

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Type
Research Article
Copyright
Copyright © International Centre for Diffraction Data 1995

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