Journal of Applied Crystallography

Volume 41, Part 5 (October 2008)

research papers

J. Appl. Cryst. (2008). 41, 854-867 [ doi:10.1107/S0021889808023911 ]

Quantitative estimation of incompatibility stresses and elastic energy stored in ferritic steel

A. Baczmanski, P. Lipinski, A. Tidu, K. Wierzbanowski and B. Pathiraj

Abstract: Plastic incompatibility second-order stresses were determined for different orientations of a polycrystalline grain, using X-ray diffraction data and results of the self-consistent elasto-plastic model. The stresses in cold rolled ferritic steel were determined both in as-received and under tensile loaded conditions. It has been shown that the Reuss model and the self-consistent model applied to near surface volume provide the best approaches to determine diffraction elastic constants. For the first time, the elastic energy in an anisotropic material (arising from plastic incompatibilities between grains having various lattice orientations) has been determined. The second-order incompatibility stresses and stored elastic energy are presented in Euler space.

Keywords: residual stresses; X-ray diffraction; diffraction elastic constants; self-consistent model.