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Hot rolled commercial metastable austenitic steel 0.8C-18Cr-10Ni-0.1Ti(Russian industrial name 08X18H10T, analog 321L) with strongly elongated thindelta-ferrite particles in its microstructure was the object of investigations.The lengths of these delta-particles were up to 500 mkm, the thickness was 10mkm. The formation of the strain-induced martensite as well as the grinding ofthe austenite and of the delta-ferrite grains take place during ECAP. Duringthe annealing of the UFG steel, the formation of the delta-phase particlestakes place. These particles affect the grain boundary migration and thestrength of the steel. However, a reduction of the Hall-Petch coefficient ascompared to the coarse-grained (CG) steel due to the fragmentation of thedelta-ferrite particles was observed. The samples of the UFG steel were foundto have 2-3 times higher stress relaxation resistance as compared to the CGsteel (a higher macroelasticity stress and a lower stress relaxationmagnitude). The differences in the stress relaxation resistance of the UFG andCG steels were investigated. ECAP was shown to result in an increase in thecorrosion rate and in an increased tendency to the intergranular corrosion(IGC). The reduction of the corrosion resistance of the UFG steel was found tooriginate from the increase in the fraction of the strain-induced martensiteduring ECAP.

Effect of ECAP and heat treatment on mechanical properties, stress  relaxation behavior and corrosion resistance of a 321-type austenitic steel  with increased delta-ferrite content