Troisiéme Conférence Européenne sur les Matériaux et les Procédés Avancés
J. Phys. IV France 03 (1993) C7-1223-C7-1228
Prévision de la réponse à la trempe des aciers en fonction de l'efficacité des fluides de trempeG. SCHANNE, G. KELLEN and C. WEIDER
UNIMETAL Recherche, BP. 140, 57360 Amneville, France
Quenching makes it possible to obtain, on previously austenitized steel parts, special structures and mechanical characteristics by making faster cooling than in calm air. To obtain this cooling, the austenitized part is plunged into a stirred fluid maintained at low temperature. After having recalled the methods making it possible to quantify the effectiveness of the quenching fluid and to foresee the aptitude of a steel grade for quenching (or hardenability), we will specify the method developed by UNIMETAL RECHERCHE : - to control, on an instrumented furnace, the quenching parameters (mainly, fluid characteristics) - to determine the cooling curves inside cylindrical steel test bars ([MATH] 10 to 60 mm) - to measure cooling speeds (Vr) at specific points on the incident curves - to establish of the relationship between Vr and the diameter [MATH] - to enter these relations into the PREVER UNIMETAL model. This makes it possible to foresee the results of conventional tests defining hardenability (JOMINY test, U curves) This model, operational in 1993, makes it possible to avoid long and costly real tests.
© EDP Sciences 1993