Static Recovery and the Orthogonal Strain Path Change Effect in IF Steel

Abstract:

Tensile tests have been carried out in the rolling and transverse directions of 'interstitialfree' (IF) steel cold rolled to a strain of εh= -0.18. Tests in the transverse direction showed the characteristic features of the orthogonal strain path change effect, with an initially increased flow stress- compared to tests in the rolling direction- followed by a transient regime of very low strain hardening. Tests were also carried out following recovery annealing of the prestrained sheet at 500°C and 600°C. Static recovery had a marked effect on the strain-induced anisotropy, but this was not eliminated even when the cell structure generated by prestraining haD condensed to one consisting of low-angle boundaries. This supports the view that the length scale, with respect to active slip systems, between boundary obstacles is a significant factor in the orthogonal path change effect.

• Periodical: Materials Science Forum (Volume 550)
• Pages: 141-148
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.550.141
• Online since: July 2007
• Authors: Pete S. Bate, Ian Brough, S. Morse
• Keywords: Anisotropy, IF Steel, Static Recovery, Strain Path

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