Temperature and strain rate effects on the mechanical behavior of dual phase steel
Artikel i vetenskaplig tidskrift, 2015

The effect of temperature and strain rate on the mechanical behavior of a commercial dual phase steel (DP 800) has been investigated experimentally by uniaxial tensile tests in this study, covering temperatures (−60 °C to 100 °C) and strain rates (1×10–4 to 1×10+2 s−1) encompassing conditions experienced in automotive crash situations. Yield and ultimate tensile strength, ductility, temperature effects and strain rate sensitivity have been determined and discussed. It was found that the Voce equation [σ=σs−(σs−σ0)exp(−εθ0/σs))] can be satisfactorily applied to describe the tensile flow curves by means of a modified Kocks–Mecking model. In this model the parameter θ0 is fixed, whereas both σ0 and σs consist of athermal and thermal stress components. The athermal component is only weakly dependent on temperature through the elastic shear modulus μ. The thermal stress component is governed by temperature and strain rate. Statistical analysis based on the experimental data has allowed all parameters in the Voce equation to be quantified.

Strain rate

Tensile properties

Dual phase steel

Temperature

Ductility

Voce equation

Författare

Yu Cao

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Birger Karlsson

Chalmers, Material- och tillverkningsteknik, Materialteknologi

Johan Ahlström

Chalmers, Material- och tillverkningsteknik, Materialteknologi

Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

0921-5093 (ISSN)

Vol. 636 124-132

Drivkrafter

Hållbar utveckling

Ämneskategorier

Materialteknik

Styrkeområden

Transport

Materialvetenskap

Fundament

Grundläggande vetenskaper

DOI

10.1016/j.msea.2015.03.019