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The effect of the interface character of TiC particles on hydrogen trapping in steel

✍ Scribed by Sung Man Lee; Jai Young Lee


Publisher
Elsevier Science
Year
1987
Weight
819 KB
Volume
35
Category
Article
ISSN
0001-6160

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✦ Synopsis


model for hydrogen trapping of particle-matrix interface was suggested, in which the large driving force for such hydrogen trapping was associated with the lowering of interfacial free energy. The effects of the character of the precipitated Tic-matrix interface on the hydrogen trapping behavior in steel was studied by utilizing the hydrogen thermal analysis technique. Incoherent titanium carbides have a larger trap activation energy of hydrogen than semi-coherent ones. Although the particles are incoherent, the trap activation energy of hydrogen increases with increasing the precipitated particle size.

Rbum&Nous

suggerons un modble pour le piegeage de l'hydrogtne par l'interface particule/matrice, modtle dans lequel la force motrice Clevie pour ce piigeage est associte a l'abaissement de l'tnergie libre interfaciale. Nous avons Btudie les effets du caractbre de l'interface TiC precipitb/matrice sur le piegeage de l'hydrogene dans l'acier en utilisant la technique de l'analyse thermique de l'hydrogene. Les carbures de titane incoherents ont une Cnergie d'activation pour le piegeage de l'hydrogene superieure I celle des carbures semi-coherents. Bien que les particules soient incoherentes, cette energie d'activation augmente avec la taille des particules prtcipitees. Zusammenfassung-Es wird ein Model1 filr den Wasserstoffeinfang an einer Grenztlache zwischen Teilchen und Matrix vorgeschlagen, bei dem die groge treibende Kraft filr diesen Einfang von der Erniedrigung der freien Grenzfllchenenergie herriihrt. Mittels der Wasserstoff-Thermalanalyse wurde der EinfluD des Charakters der Grenzfllche Tic/Matrix untersucht. Inkohlrente Titankarbide weisen eine hohere Aktivierungsenergie fur Wasserstoffeinfang auf als semikohirente. Obwohl die Teilchen inkohlrent sind, steigt die Aktivierungsenergie fiir Wasserstoffeinfang mit der Zunahme der Gr6Be der Ausscheidungsteilchen an.


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