Characteristics of Martensitic Transformations Induced by Uni-Axial Tensile Tests in a FeMnCr Steel

Abstract:

Austenitic FeMnCr steels have high strength, high toughness and formability because of the stress-and strain-induced γ→α and γ→ε martensitic phase transformations. These are the so-called TRIP (Transformation Induced Plasticity) and TWIP (Twining induced Plasticity) effects. TWIP steels deform by both glide of individual dislocations and mechanical twinning [1]. The type and mechanism of the austenite→martensite transformation depends on the composition, deformation rate and temperature. The ratio and quantity of the resulting phases determine the properties of the product. It is known that austenitic steels can transform into α and/or ε martensite phases during plastic deformation The characteristics of the martensitic transformations induced by uni-axial tensile tests between room temperature and 200°C in a FeMnCr steel with 2,26 w% Cr content were examined. Mechanical properties as, yield stress were determined from tensile tests. Metallographic examinations, quantitative and qualitative phase analysis by X-ray diffraction were carried out on the uniformly elongated part of the samples (cross, longitudinal sections).

• Periodical: Materials Science Forum (Volume 812)
• Pages: 161-166
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.812.161
• Online since: February 2015
• Authors: Valéria Mertinger*, Erzsebet Nagy, Márton Benke, Ferenc Tranta
• Keywords: Martensitic Transformation, TRIP Steel, TWIP Steel

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