Characterization of thermo-mechanical behavior and adiabatic shear band formation in a press- hardened 22MnB5 steel at different strain rates
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Date
2025-08-26
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Abstract
Adiabatic Shear Band formation is observed in high-speed shear deformation of metallic
materials, particularly in technologically relevant processes. It is characterized by the
formation of increasingly localized areas of high shear strains. Depending on the selected
process parameters, high-speed or adiabatic blanking can lead to the formation of an
adiabatic shear band in the newly generated surface. These blanked surfaces have
outstanding properties (e.g. high hardness, low rollover, low roughness, almost no burr)
and can be used directly as functional surfaces. This reduces the need for complex and
expensive, additional mechanical surface processing, significantly shortening the process
chain and thus saving energy. In this contribution, we investigate the thermo-mechanical
behavior and shear band formation of a press-hardened martensitic steel 22MnB5 under
different strain rates. Tensile and compression tests are performed at different temperatures
(in the range from 293 to 673 K) and in a wide range of nominal strain rates between 10-3
and 4∙10 3 s-1. In addition, we use S-shaped samples to introduce a simple shear stress state
to generate (adiabatic) shear bands, again while applying quasi-static and dynamic
(nominal) strain rates, respectively. The plane surface of this sample geometry enables an
in-situ observation of local strain fields by digital image correlation. We show the
mechanical similarities and differences of dynamic versus quasi-static shear experiments
using digital image correlation. Our experimental approach contributes to a deeper
understanding of the rate and stress-state dependent formation of shear bands in
press-hardened steels.
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Keywords
thermo-mechanical behavior, dynamic testing, strain rate dependency, shear band
Subjects based on RSWK
Scherband, Thermomechanische Eigenschaft, Spannungs-Dehnungs-Beziehung, Mangan-Bor-Stahl, Formhärten, Zerstörungsfreie Werkstoffprüfung, Bildkorrelation