TEM investigation of the tempering behaviour of the maraging PH 17.4 Mo stainless steel |
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| Authors: | C. Servant El H. Gherbi G. Cizeron |
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| Affiliation: | (1) Laboratoire de Métallurgie Structurale, Université Paris-Sud Centre d'Orsay, Bât 413, UA CNRS 1107, 91405 Orsay Cedex, France;(2) Laboratoire de Structure des Matériaux Métalliques, Université Paris-Sud Centre d'Orsay, Bât 465, 91405 Orsay Cedex, France |
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| Abstract: | The PH 17-4 Mo steel (Z6 CND 17.04.02), used in the steam generator of nuclear reactors, was investigated in order to determine the structural evolution occurring during tempering carried out under various conditions of duration and temperature. The formation and growth of different types of carbides such as Mo2C, M23C6 and M7C3 and of Fe2Mo intermetallic compound were studied and also of reversed austenite. A small secondary hardening peak was observed for tempering close to 400' C which is related to the Mo2C carbide precipitation; beyond this temperature, softening occurs. |
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