Abstract
The elevated temperature mechanical properties of a 1.8 pct C-1.6 pct Al ultrahigh carbon steel (UHCS-1.8C-1.6Al) is described in the temperature range from 750 °C to 1150 °C and in the strain rate range from 0.2 to 26 s−1. A torsion test apparatus was used which permitted rapid cooling (50 °C per second) immediately after fracture to establish microstructure-processing-property relations. The strength-strain rate relation of the UHCS-1.8C-1.6Al material correlates well with a lattice diffusion-controlled dislocation creep process. The present data, together with other high carbon steels data, predict that austenite containing a high amount of carbon in solution has a high stacking fault energy. The ductility of the UHCS-1.8C-1.6Al is maximum at 1050 °C. This indicates that successful deep die forging and other mechanical processing operations at high strain rates should be performed at this temperature. The microstructure of the deformed samples consisted of a matrix of pearlite with some undissolved spherical carbides when rapidly cooled from 900 °C and 1050 °C and of a thin network of proeutectoid carbides when cooled from 1150 °C. High hardnesses in the range of Rockwell C 42 to 50 are obtained for such structures.
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Carsi, M., Ruano, O.A., Peñalba, F. et al. High strain rate torsional behavior of an ultrahigh carbon steel (1.8 Pct C-1.6 Pct Al) at elevated temperature. Metall Mater Trans A 28, 1913–1920 (1997). https://doi.org/10.1007/s11661-997-0121-7
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DOI: https://doi.org/10.1007/s11661-997-0121-7