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The authors present a statistical analysis of the results of Charpy V-notch transition temperature obtained on 115 Ni-Cr-Mo-V, Cr-Mo, and Cr-Mo-V rotors. Because heat treatment of these forgings includes a slow cooling after tempering, a particular study or reversible temper embrittlement is made separately. The lowest transition temperature in the regenerated state (without embrittlement) is achieved by lowering the phosphorus and carbon contents, raising alloying element percentages, and accelerating the quench rate. The embrittlement is reduced by keeping phosphorus and arsenic contents to a minimum, and tempering temperature to a maximum, and replacing chromium, nickel, molybdenum, and especially manganese by carbon and vanadium. The tin and antimony contents do not vary sufficiently to enable the authors to determine their effect.
temper embrittlement, mechanical properties, statistical analysis correlation, brittle fracture, rotating generators, appearance, transition temperature, evaluation
Research engineer, head, and scientific managerpersonal member ASTM, Société des Forges et Ateliers du Creusot,
Martin, P. F.
Bastien, P. G.