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Metals and Materials International , 2019년, pp.846 - 859   http://dx.doi.org/10.1007/s12540-019-00255-w
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On the Reversion and Recrystallization of Austenite in the Interstitially Alloyed Ni-Free Nano/Ultrafi ne Grained Austenitic Stainless Steels
On the Reversion and Recrystallization of Austenite in the Interstitially Alloyed Ni-Free Nano/Ultrafi ne Grained Austenitic Stainless Steels

D. Rasouli  A. Kermanpur  E. Ghassemali  A. Najafizadeh 
  • 초록

    The martensite reversion treatment was conducted on two grades of Ni-free austenitic stainless steels interstitially alloyed withC and N. The hot rolled sheets of steels were cold rolled up to 80% thickness reduction to acquire strain-induced α′-martensiteand subsequently reversion annealed at temperatures from 700 to 850 °C for 1 to 1000 s to revert the α′-martensite to austenite. Microstructural evolution was investigated using optical microscopy, X-ray diff raction, electron backscatter diff raction,and magnetic measurement techniques. Mechanical properties were measured using tensile tests at room temperature. The resultant microstructures contained both reverted and recrystallized austenite when reverted at 700 and 750 °C withthe annealing time less than 100 s. A nonuniform grain structure was characterized under these conditions consisting ofnano/ultrafi ne grains formed via α′-martensite reversion and coarser grains by recrystallization of the retained austenite. However, a more uniform austenite grain size with average size of 1 μm was obtained at 850 °C for 1000 s. The specimenshaving nonuniform grain structure exhibited excellent combinations of strength and ductility. A variety of mechanical propertieswas achieved depending on the annealing condition. The work hardening behavior aff ected UTS and ductility of thestudied steels. The shift of the work hardening peaks to the higher strains was found suitable for ductility. Addition of C toN-containing Ni-free steels deteriorated mechanical properties. Best combination of strength and elongation was obtainedin the test material with lower C/N ratio.


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