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Characterization of 7-mm-Thick Hot-Rolled Ultrahigh-Strength Steel Used in Warm Forming

This article describes the mechanical material characterization of a novel 7 mm thick Ultra High Strength Steel grade, WARMLIGHT-980 (UTS 980 MPa), intended for warm forming processes in the temperature range of 430 to 580°C. The aim is to produce lighter parts with high stiffness and good fatigue properties targeted for the Heavy-Duty Vehicle sector. The elastoplastic properties as well as the ductile failure properties were therefore determined at the enhanced temperatures for future use in numerical simulations of e.g. warm forming operations. The failure strains at various stress triaxialities were extracted from digital image correlation of different specimen geometries. Due to the thickness (7 mm), impractically large specimens would be needed, therefore downsized 1.2 mm specimens were produced. The use of smaller and thinner specimens has been confirmed by comparing the work hardening up to necking obtained in uniaxial tensile tests (1.2- and 7-mm thickness). The enhanced temperatures were obtained by inductive heating and the homogeneous temperature distribution was validated by thermal photography.

DOI Number: 10.33313/512/B1001
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2024 CHS2 Conference Proceedings
PR-512-B1001
Fredrik Larsson, Samuel Hammarberg, Jorgen Kajberg
May 27, 2024
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