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Microstructure observation and quantification of the liquid fraction of M2 steel grade in the semi-solid state, combining confocallaser scanning microscopy and X-ray microtomography

Article dans une revue avec comité de lecture
Author
GU, Guochao
107452 Laboratoire de Conception Fabrication Commande [LCFC]
ccPESCI, Raphaël
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
ccLANGLOIS, Laurent
107452 Laboratoire de Conception Fabrication Commande [LCFC]
ccBECKER, Eric
107452 Laboratoire de Conception Fabrication Commande [LCFC]
ccBIGOT, Regis
107452 Laboratoire de Conception Fabrication Commande [LCFC]
GUO, M.X.

URI
http://hdl.handle.net/10985/9001
DOI
10.1016/j.actamat.2013.11.075
Date
2014
Journal
Acta Materialia

Abstract

Microstructure is of crucial importance to the flow behavior of semi-solid slurries during the thixoforging process. Therefore, a thorough understanding of the microstructure evolution is required. In order to achieve this, high temperature confocal laser scanning microscopy (CLSM) and high energy X-ray microtomography were used to investigate the microstructure evolution of several steel grades (M2, 100Cr6 and C38LTT) during the heating process from as-received conditions to the semi-solid state. It was found that the microstructure development of M2 can be directly studied at high temperature via these two techniques. Two types of small carbides (MC and M6C) were present in the as-received state, while totally new interconnected carbides of specific size and composition were formed from liquid zones after cooling. It was also noted using CLSM that the diffusion rate of the alloying elements during the cooling of M2 was very low. This confirms that the volume fraction of the liquid phase of M2 at high temperature can be evaluated by threedimensional X-ray microtomography in situ at high temperature and on quenched specimens. Contrary to M2, the microstructure of the steel grades 100Cr6 and C38LTT in the semi-solid state can only be revealed by CLSM at high temperature. All these observations are discussed in terms of microstructural development and liquid fraction during heating.

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