Effect of nitrogen and stacking-fault energy on twinning in [$$\bar 1$$11] single crystals of austenitic stainless steels

The dependence of critical shear stresses for twinning τ cr tw on the stacking-fault energy γ0, the nitrogen concentration C N (wt %), and the test temperature has been studied for [ $$ \bar 1 $$ 11] single crystals of austenitic stainless steels upon tensile deformation. It is shown that τ cr tw ∼ γ0/b 1 in nitrogen-free steels, while it exhibits a nonmonotonic dependence on the nitrogen concentration C N in nitrogen-alloyed steels. An increase in τ cr tw at C N = 0.3 wt % and its decrease at C N ≥ 0.5–0.7 wt % are determined by the competition of two contributions to τ cr tw , namely, a decrease in γ0 and a solid-solution hardening with increasing nitrogen concentration.

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