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Effect of N on Phase Transformations During Martensite Thermomechanical Processing of the Nano/Ultrafine-Grained 201L Steel

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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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Acknowledgments

The authors would like to express their thanks to Dr. P. Behjati and Mr. M. Fadavi for their kind collaborations.

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Authors and Affiliations

  1. Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran

    S. Saeedipour & A. Kermanpur

  2. Foulad Institute of Technology, Fouladshahr, 84916-63763, Iran

    A. Najafizadeh

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Correspondence to S. Saeedipour.

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Saeedipour, S., Kermanpur, A. & Najafizadeh, A. Effect of N on Phase Transformations During Martensite Thermomechanical Processing of the Nano/Ultrafine-Grained 201L Steel. J. of Materi Eng and Perform 25, 5502–5512 (2016). https://doi.org/10.1007/s11665-016-2387-7

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