An Investigation Into Martensitic
Transformation In Hot Stamping Process
Author(s)
M. Naderi & W. Bleck
Abstract
The main target of the hot stamping process is to get fully martensitic
microstructure in the end product. In the current study, the hot stamping process
is simulated by the simultaneous forming and quenching experiments. This is
done through uniaxial compression tests at high temperatures by a dilatometry
machine. The effects of process parameters like strain, strain rate, initial
deformation temperature and austenization soaking time and mainly the applied
force, on martensitic transformation of the ultra high strength boron steel are
investigated. Besides, the presence of other phases like bainite and ferrite and
their effects on martensitic transformation is considered. It is concluded that by
increasing strain rate and initial deformation temperature, martensite content,
hardness and martensite start temperature (Ms) are increased. On the contrary, by
applying higher deformations, the above mentioned properties are decreased. It is
also concluded that, regardless of the process parameters, higher applied forces
deteriorate the successful martensitic transformation during the hot stamping
process.
Keywords: hot stamping, boron steel, martensitic transformation.
1 Introduction
In hot stamping process, the material is subjected to a high temperature
austenization and subsequently formed. Then, it is cooled in the die rapidly
enough to ensure the formation of martensite. In this process the material is
subjected to the thermo-mechanical treatment in the austenite region. This
thermo-mechanical treatment will influence the final microstructure and
properties of the material.
Keywords
hot stamping, boron steel, martensitic transformation.
Related Book
Other papers in this volume
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