Abstract
Tensile and creep properties were determined on a V-Ti-B-modified 2.25Cr-lMo steel. The modified 2.25Cr-lMo steel had about 0.2 pct V added for improved elevated-temperature strength. Boron was added to improve the hardenability, thus allowing thicker sections to be quenched or normalized to completely bainitic microstructures. Lower carbon and silicon concentrations were used (~0.1 pct C and 0.02 pct Si) than in standard 2.25Cr-lMo steel. The modified steel had substantially better stress-rupture properties than did a standard 2.25Cr-lMo steel (both with bainitic microstructures) with equivalent tensile properties — especially at the lowest stresses and highest temperatures. Comparative transmission electron microscopy studies of the standard and modified 2.25Cr- lMo steels indicated that the differences involved the carbide precipitates and the dislocation substructures present in the steels.
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Klueh, R.L., Swindeman, R.W. The microstructure and mechanical properties of a modified 2.25Cr-lMo steel. Metall Trans A 17, 1027–1034 (1986). https://doi.org/10.1007/BF02661268
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DOI: https://doi.org/10.1007/BF02661268