apparaît clairement pour la chaleur latente de fusion. La valeur de cette propriété critique varie fortement selon les auteurs. Nous avons choisi la valeur de 272 kJ/kg, proposée par Ballantyne, qui est aussi égale à la moyenne pondérée de toutes les chaleurs latentes de fusion des éléments composant l'alliage 718 ,
il existe un bon accord entre tous les auteurs en ce qui concerne les valeurs de l'émissivité, de la viscosité dynamique et du coefficient d'expansion thermique, si bien que ces propriétés ont été fixées respectivement à 0 ,
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