Analysis of Shear Localization in High-Speed Blanking of Press-Hardened 22MnB5 Steel
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Date
2025-08-26
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Abstract
High-speed blanking induces a shear localization in high-strength steels, improving the
quality of the blanked edge in terms of geometrical shape, separation surface roughness,
and shear-influenced zone close to the cut edge. High-speed blanking experiments with a
20 mm punch diameter and 8 m/s velocity of 2 mm thick 22MnB5-sheets (ultimate tensile
strength of 1550 MPa) utilizing a relative clearance of 2.5 % are carried out. Two types of
shear bands are observed in the post-process: A 'deformation shear band,' characterized by
elongated grains in shear direction, is distinguished from a ‘transformation shear band’
with a change in microstructure appearing as a white layer in optical microscopy. Previous
investigations by transmission electron microscopy showed that this white layer consists of
nanosized grains in 22MnB5 material. Light microscopic images show that the transfor mation
shear band width varies over the sheet thickness. Independent of the occurrence of a
transformation shear band, a localization with a width of less than 20 µm is observed along
the blanked edge. Fractographic analysis by scanning electron microscopy shows no evi dence
of brittle fracture. Characteristic areas of the separation surfaces coincide with the
observed two types of shear bands at the blanked edge
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Keywords
High-speed blanking, Microstructure, High-strength steels, Shear localization
Subjects based on RSWK
Mangan-Bor-Stahl, Stanzen, Formhärten, Scherung, Fraktographie, Zerstörungsfreie Werkstoffprüfung, Rasterelektronenmikroskop, Mikrostruktur