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This paper describes research on 2¼Cr-1Mo steel using a heavy test block [weight approximately 4540 kg (10 000 lb)] having wall thicknesses of 15, 30, and 50 cm (6, 12, and 20 in.) (solidification moduli of 5.5, 9.5, and 13.1 cm, respectively).
The relation of solidification and secondary structures (surface, transition, and center area) versus mechanical properties after normalizing and tempering as well as in the quenched and tempered condition were studied. ISO-V-notch energy between −60 and +100°C (−76° and 212°F) at surface and center areas of the three wall thicknesses was determined.
Results of fracture toughness KIc (ASTM E 399) and crack-opening displacement (COD) (ASK-AN-220, 1976) are given. Furthermore, results of fatigue crack growth tests using specimens from the 30-cm (12-in.) casting in the oil-quenched and tempered condition are given.
2¼Cr-1Mo cast steel, heat treatment, microstructure, mechanical properties, fracture toughness, fatigue, fatigue crack growth rate
Dipl.-Ing., George Fischer Limited, Schaffhausen,
Dipl.-Ing., Stahlwerke Bochum AG, Bochum,
Dr.-Ing., Thyssen Giesserei AG, Mulheim/Ruhr,