By A. Niku-Lari
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De Benedetti and A. Demiss coil shower Fig. 2 mm/s, P = 24 kW for different distances between coil and shower for cast iron, a) L = 15 mm; b) L =30 mm. 0 F i g . 5 - Time v a r i a t i o n of t e m p e r a t u r e a t r = 18 mm, f o r d i f f e r e n t n e t power i n p u t s f o r carbon s t e e l , a ) P = 20 kW; b) P = 24 kW; c) P = 28 kW. 0 Timets] Fig. 7 - Time variation of temperature at r = 18 mm for different between coil and shower for cast iron, a) L = 15 mm; b) L =30 mm. distances 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. : The x). T = Nj_ Ίλ + N 2 T 2 + N 3 T 3 + NA T A (Al) N^'s "shape functions" are dependent only on the space variables (r and The second step is the choice of the solution strategy of the differential equation (1) with the boundary conditions (2), (3) and (4).
Dans certaines conditions, la trempabilite peut etre localement diminuee au voisinage de la surface et conduire ä un affaiblissement de la durete superficielle. Nous nous proposons de rendre compte du role de l'azote dans les microstructures obtenues par une expression modifiee de la temperature de debut de transformation martensitique, fonction de la substitution du carbone par l'azote. 47 48 J. Lesage and A. lost Materiaux - Techniques experimentales Les aciers de type 27CD4 et 27MC5 (Norme AFNOR) ont la composition chimique donnee dans le tableau 1.
Advances in Surface Treatments. Technology–Applications–Effects by A. Niku-Lari