Abstract
Processing and instability maps using a dynamic materials model have been developed for stainless steel type AISI 316L in the temperature range 600–1250°C and strain rate range 0·001–100 s−l with a view to optimising its hot workability. Stainless steel type AISI 316L undergoes dynamic recrystallisation, with a peak efficiency of 35% at 1250°C and 0·05 s−1, which are the optimum parameters for hot working this material. The material undergoes dynamic recovery at 900°C and 0·001 s−1. The increase in the dynamic recrystallisation and dynamic recovery temperatures in comparison with stainless steel type AISI 304L is attributed to the presence of a backstress caused by the molybdenum additions. These results are in general agreement with those reported elsewhere on stainless steel type 316 deformed in hot extrusion and hot torsion. At temperatures <850°C and strain rates >10 s −1, the material exhibits flow localisation owing to adiabatic shear band formation, whereas at higher temperatures (>850°C) and strain rates (>10 s−1) mechanical twinning and wavy slip bands are observed.MST/1769
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