Grain Size Effect on the Martensite Formation in a High-Manganese TWIP Steel by the Rietveld Method

J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (2): 181-186.

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Grain Size Effect on the Martensite Formation in a High-Manganese TWIP Steel by the Rietveld Method

G. Dini¹⁾, A. Najagizadeh¹⁾, S.M. Monir-Vaghefi¹⁾, R. Ueji²⁾

1) Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
2) Department of Advanced Materials Science, Faculty of Engineering, Kagawa University, 2217-20, Hayashi-cho, Takamatsu, Kagawa, 761-0396, Japan

Received:2009-01-05 Revised:2009-07-06 Online:2010-02-28 Published:2010-02-28
Contact: G. Dini

Abstract

Abstract:

The aim of the present work was to study the effect of austenite grain size (AGS) on the martensite formation in a high-manganese twinning-induced plasticity (TWIP) steel. The results of a quantitative microstructural characterization of the steel by the whole X-ray pattern fitting Rietveld software, materials analysis using diffraction (MAUD), indicated that the volume fraction of ffbcc-martensite increases with increasing AGS. However, the value of the stacking fault probability (Psf ) does not show a large variation for samples with different values of AGS under water-quenching conditions.

Key words: Austenite grain size, Martensite formation, TWIP steel, Stacking fault probability

G. Dini, A. Najagizadeh, S.M. Monir-Vaghefi, R. Ueji. Grain Size Effect on the Martensite Formation in a High-Manganese TWIP Steel by the Rietveld Method[J]. J Mater Sci Technol, 2010, 26(2): 181-186.

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Grain Size Effect on the Martensite Formation in a High-Manganese TWIP Steel by the Rietveld Method

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