EVALUATION OF MICROSTRUCTURAL TRANSFORMATIONS IN 201L STAINLESS STEEL DURING ADVANCED THERMOMECHANICAL PROCESS

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REZAEE A.; NAJAFIZADEH A.; KERMANPUR A.; MOALLEMI M.

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Paper Information

Journal: JOURNAL OF NEW MATERIALS Year:2011 | Volume:1 | Issue:2 Page(s): 13-19

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Information Journal Paper

Title

EVALUATION OF MICROSTRUCTURAL TRANSFORMATIONS IN 201L STAINLESS STEEL DURING ADVANCED THERMOMECHANICAL PROCESS

Author(s)

REZAEE A. | NAJAFIZADEH A. | KERMANPUR A. | MOALLEMI M. | Issue Writer Certificate

Keywords

201L STAINLESS STEELQ3

MARTENSITEQ2

COLD ROLLINGQ2

ANNEALINGQ2

Abstract

In this study, microstructural transformations in AISI 201 L stainless steel during advanced thermomechanical process is investigated. The as-cast specimens were first homogenized at 1200oC for 15 h, and then hot forged in order to prepare a suitable microstructure for the subsequent treatment involving conventional COLD ROLLING and ANNEALING. COLD ROLLING was carried out at reductions of % 10-95. The reversion of MARTENSITE to austenite in the cold rolled specimens was carried out by ANNEALING in the temperature range of 750-900oC for different times from 15 to 1800 s. The specimen microstructures were observed by optical and scanning electron microscopy (SEM). The identification of different phases was carried out using X-ray diffraction (XRD) and Feritscope. The results showed that increasing the strain resulted in an increased volume fraction of the strain induced MARTENSITE during COLD ROLLING and a reduced MARTENSITE saturating strain. Also, the nanocrystalline austenitic structure with an average grain size of about 100 nm was obtained by ANNEALING the %95 cold rolled specimen at 850 and 900oC for 30 s.

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