Temperature and Stress State Influence on Mechanical Properties and Damage Evolution of Dual-Phase Steels

Abstract:

Dual Phase steels are increasingly selected for structural applications including parts in automotive industry because of their interesting mechanical properties and their good formability. This work presents an experimental analysis of the evolution of microstructure of a DP1000 alloy submitted to thermomechanical loadings. Monotonous tensile tests were performed at various plastic strain levels up to fracture for temperatures ranging between 25 °C and 440 °C. A strong degradation of the mechanical properties is observed for temperatures higher than 275 °C. The evolution with plastic strains and temperature of the microstructure was studied by scanning and transmission electron microscopy. Different microstructure parameters such as volume fraction of martensite and carbide precipitation were taken into account in order to understand the mechanical behavior of DP1000 steels tested in this temperature range. The microstructural observations indicate that diminution of carbon in martensite, due to its diffusion to form carbides, could partially explain the drop in mechanical properties at around 275 °C.

• Periodical: Materials Science Forum (Volumes 783-786)
• Pages: 886-891
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.783-786.886
• Online since: May 2014
• Authors: Mayerling Martinez*, Jerôme Chottin, Eric Hug
• Keywords: Dual Phase Steel, Electron Microscopy, Formability, Mechanical Property, Steel Microstructure

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