SYMPOSIA PAPER Published: 01 January 1968

Statistical Study of Factors Influencing Impact Strength of Turbine Generator Rotors—Influence of Temper Embrittlement


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.

Author Information

Comon, J.
Société des Forges et Ateliers du Creusot, France
Martin, P., F.
Bastien, P., G.
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Developed by Committee: A01
Pages: 74–89
DOI: 10.1520/STP46476S
ISBN-EB: 978-0-8031-6804-6
ISBN-13: 978-0-8031-6628-8