Abstract
Effect of N addition on microstructural evolutions and mechanical properties of a 201L austenitic stainless steel during the martensite thermomechanical treatment was investigated. The as-homogenized samples were cold-rolled by 90% thickness reduction followed by reversion annealing at 800-900 °C for different times of 15-1800 s. The microstructures were characterized by optical and scanning electron microscopy and magnetic measurement, while mechanical properties were determined by hardness and shear punch tests. It was found that N addition retards the kinetics of strain-induced martensitic transformation, but accelerates the martensite reversion. The hardness, yield and ultimate shear strengths were increased by N alloying at the expense of elongation in both solution-annealed and reversion-annealed specimens.
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