Título

Effects of Test Temperature and Strain-rate on the Flow Curve of a SUS 301 Foil under Tension and an Analysis of Them by the Proposed Constitutional Equations

Autoria

TAKIMOTO, AKIO

TAKIMOTO, AKIO

Eu sou esse autor

DOI

10.5151/2594-5327-49v2-193-206

Downloads

Resumo

Resumo (conforme o texto original): A SUS 301 Stainless foil of 50 µm thickness has been deformed under tension at various temperatures between 20 °C and -190 °C, changing a strain-rate from the static values (ε̇ = 7E) to the dynamic ones (2×10³, 5×10³ s⁻¹). The volume fraction of strain-induced martensite is analyzed by x-ray diffraction and is expressed as a function of the total plastic strain, which is approximated well by a modified equation for a shear band intersection mechanism (SBIM). The coefficients in the equation are examined to change continuously with respect to temperature and strain-rate. The complex flow curves of them are controlled by each phase stress and strain, volume fractions of coexisting austenite and martensite and the transformation strain. The curves are fitted well by the proposed constitutional equations for a variable volume model (VVM), which include the above terms and the SBIM relation. Using the regressed coefficients in equations for VVM, the transformation strain as well as the stress and strain contributed by each phase to the total stress and strain are calculated as functions of the applied plastic strain, and a mechanically balanced condition in stress and strain of two phases at a given plastic strain is analyzed at each test condition.

Palavras-chave

SUS 301 foil, Flow curve, Strain-induced martensite, Temperature effect, Strain-rate, Shear band intersection mechanism, Variable volume model, X-ray diffraction