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Etude et compréhension des mécanismes de vieillissement des alliages de plomb-calcium

Abstract : The data available in the literature about ageing and overageing of lead-calcium alloys are often incomplete and inconsistent. It is undoubtedly due to the experimental difficulties encounted to observe the structure transformations which are numerous. As a result there is a certain confusion among the results of the different autors. Moreover, small variations in the process parameters and chemical composition may have some influence on the alloy behaviour. This work enabled us to obtain a set of TTT diagrams, more realistic and accurate than the ones available in the literature. Experimental techniques developed (particularly the preservation of the cold chain with is essential for the guaranty of the results repeatability), enabled particularly the study of the first transformations and better control the five stages of ageing and overageing. Our work have enabled to determine precisely the kinetics and the mechanisms of the transformations. This work constitutes a thorough analysis of the ageing and overageing of theses alloys.
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Submitted on : Tuesday, June 12, 2007 - 8:00:00 AM
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  • HAL Id : pastel-00002514, version 1


Frédéric Rossi. Etude et compréhension des mécanismes de vieillissement des alliages de plomb-calcium. Sciences de l'ingénieur [physics]. Arts et Métiers ParisTech, 2006. Français. ⟨NNT : 2006ENAM0070⟩. ⟨pastel-00002514⟩



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