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Study of strain-induced martensite in an austenitic stainless steel after low temperature deformation

Grant number: 17/17446-2
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): October 01, 2017
Effective date (End): September 30, 2018
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
Principal Investigator:Kahl Dick Zilnyk
Grantee:Gabriel Vinicius Assai Vaz
Home Institution: Instituto Federal de Educação, Ciência e Tecnologia de São Paulo (IFSP). Campus Itapetininga. Itapetininga , SP, Brazil

Abstract

Austenitic stainless steels are materials with high resistance to corrosion and oxidation, thus possessing several specific applications. The high concentration of alloying elements in these materials causes the austenitic phase to be found at room temperature, but in a metastable condition. Due to this metastability, the austenite can undergo a phase transformation when plastically deformed, giving rise to the strain-induced martensite. Besides the chemical composition, one of the most important factors for the formation of the strain-induced martensite is the temperature. In the present project we intend to deform, by means of uniaxial tensile testing, specimens of an AISI 304 austenitic stainless steel at ambient temperature and at low temperatures to evaluate the effect of temperature on the formation of strain-induced martensite. The microstructure of the tested material will be characterized by optical microscopy and X-ray diffraction, allowing the determination of the phase transformation kinetics and the nature (cubic or hexagonal) of the induced martensite. (AU)