Deformation induced martensitic transformation in stainless steels

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 378; no. 1; pp. 308 - 313
• Main Authors: Nagy, E., Mertinger, V., Tranta, F., Sólyom, J.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 25-07-2004; Elsevier
• Subjects: Applied sciences; Cross-disciplinary physics: materials science; rheology; Elasticity. Plasticity; Exact sciences and technology; Martensitic transformation; Martensitic transformations; Materials science; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Texture; TRIP steels; Martensitic transformation; Texture; TRIP steels; Austenitic stainless steel; Temperature; Microstructure; Uniaxial load; X ray diffraction; Tension test; Pole figures; Orientation relation; Strain rate
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2003.11.074

Deformation induced martensitic transformation was investigated in metastable austenitic stainless steel. This steel can present a microstructure of austenite (γ), α′ martensite and non magnetic ε martensite. Uni-axial tensile test was used for loading at different temperatures below room temperature (from −120 to 20
°C). During the deformation the transformation takes place at certain places in an anisotropic way and texture also develops. Quantitative phase analysis was done by X-ray diffraction (XRD) and magnetic methods while the texture was described by X-ray diffraction using a special inverse pole figure. The quantitative phase analysis has shown that the formation of α′ and ε martensite from austenite is the function of deformation rate, and deformation temperature. The transformation of the textured austenite takes place in an anisotropic way and a well defined crystallographic relationship between the parent and α′ martensite phase has been measured.