High strain rate torsional behavior of an ultrahigh carbon steel (1.8 pct C-1.6 pct Al) at elevated temperature
- CSIC, Madrid (Spain). Dept. of Physical Metallurgy
- INASMET, San Sebastian (Spain)
- Stanford Univ., CA (United States). Dept. of Materials Science and Engineering
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 1,150 C and in the strain rate range from 0.2 to 26 s{sup {minus}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 1,050 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 1,050 C and of a thin network of proeutectoid carbides when cooled from 1,150 C. High hardness in the range of Rockwell C 42 to 50 are obtained for such structures.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 544065
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 9 Vol. 28; ISSN 1073-5623; ISSN MMTAEB
- Country of Publication:
- United States
- Language:
- English
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