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Christien, F., Telling, M. T. F. & Knight, K. S. (2013) A comparison of dilatometry and in-situ neutron diffraction in tracking bulk phase transformations in a martensitic stainless steel. Mater. Charact. 82 50–57.
Added by: Laurent Cournède (2016-03-10 21:23:30) |
| Type de référence: Article DOI: 10.1016/j.matchar.2013.05.002 Numéro d'identification (ISBN etc.): 1044-5803 Clé BibTeX: Christien2013 Voir tous les détails bibliographiques  |
Catégories: ID2M Mots-clés: alloys, alpha', Austenite, austenite decomposition, conversional model, Dilatometry, expansion, High temperature, iron, Martensite, Mo, neutron diffraction, Phase transformation, rietveld method, steel, temperature Créateurs: Christien, Knight, Telling Collection: Mater. Charact. |
Consultations : 1/564
Indice de consultation : 4% Indice de popularité : 1% |
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Phase transformations in the 17-4PH martensitic stainless steel have been studied using different in-situ techniques, including dilatometry and high resolution neutron diffraction. Neutron diffraction patterns were quantitatively processed using the Rietveld refinement method, allowing the determination of the temperature-dependence of martensite (alpha', bcc) and austenite (gamma, fcc) phase fractions and lattice parameters on heating to 1000 degrees C and then cooling to room temperature. It is demonstrated in this work that dilatometry doesn't permit an accurate determination of the end temperature (Ac3) of the alpha' -{>} gamma transformation which occurs upon heating to high temperature. The analysis of neutron diffraction data has shown that the respective volumes of the two phases become very close to each other at high temperature, thus making the dilatometric technique almost insensitive in that temperature range. However, there is a very good agreement between neutron diffraction and dilatometry at lower temperature. The martensitic transformation occurring upon cooling has been analysed using the Koistinen-Marburger equation. The thermal expansion coefficients of the two phases have been determined in addition. A comparison of the results obtained in this work with data from literature is presented. (C) 2013 Elsevier Inc. All rights reserved.
Added by: Laurent Cournède |