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A flow-chart of the solution procedure is illustrated in fig. 2. RESULTS AND DISCUSSION The effect of the variation of some parameters, among the ones easy to regulate in induction hardening equipment, can be evidentiated by the use of the FEM. In Figs. 3a, 3b and 3c it is possible to recognize how deep the isothermal line of 850 deg C (assumed as the inferior limit of complete austenitisation) is as a function of the relative velocity between coil and piece, with approximatevely the same maximum surface temperature.
C. (1977), The Finite Element Method, McGraw Hill, London 28 M. Cali, B. de Benedetti and A. Demiss APPENDIX - HINTS ON FINITE ELEMENT METHOD The FEM is used in this case as a technique for solving a differential equation, with the proper boundary conditions, of a variable defined in a continuous space; the variable is the temperature. First the space domain is subdivided into sub-domains, the "Finite Elements" (FE); in the case examined each FE is a regular quadrilateral characterized by four points called nodes in the four corners.
H. Kloss (1983). HTM, Nr. 4, 170. , and K. Schloetterman (1983). Tragfaechigkeitssteigerung von Zahnraedern durch Plasmanitrieren. Industrie - Anzeiger, Nr. 13, 27. PREVISION DE LA MICROSTRUCTURE DES COUCHES OBTENUES PAR CARBONITRURATION ET TREMPE J. Lesage et A. lost Laboratoire de Metallurgie Physique, Universite de Lille 1, 59635 Villeneuve d'Ascq Cedex, France RESUME Dans ce travail, nous rendons compte du role de 1'azote dans les microstructures d'aciers carbonitrures. Une expression de la temperature MS est modifiee en fonction de la substitution du carbone par l'azote.