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By A. Niku-Lari

ISBN-10: 0080349234

ISBN-13: 9780080349237

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Upon plasma nitriding the compound layer type was determined by X-ray diffraction analysis and microstructure by optical microscopy methods. Hardness depth profile, roughness and change of crankshaft journal and pin diameters were also measured. Fatigue strength was tested on a bending fatigue machine. It was found that plasma nitrided crankshafts having 0,4 mm diffusion zone and a very thin compound layer of 760 HV0,3 hardness showed much better fatigue strength than not nitrided crankshafts and better than gas nitrided ones.

Vol. G. Press. (1966). Industrial application of induction heating. Pergamon Melander M. (1985). Theoretical and experimental study of stationary and progressive induction hardening. Jj_ Heat Treating, Vol. 4, N. , 145166. Ericcson (1983). Theoretical and experimental study of induction and laser hardening. Proc. 3th Int. Congr. Heat Treat. 85 Nemoto K. Tabuchi (1984). Thermal analysis of induction heating by the Finite Element Method using a computer. Proc. 10th UIE Congress, Stockholm, June 18-22, Poster N.

La figure 7 compare les valeurs calculees et mesurees d'austenite retenue. La correlation est cette fois tres satisfaisante surtout si 1' on tient compte des inhomogeneites de carbonitruration toujours possibles dans le cas de traitements industriels et des incertitudes sur FA et les valeurs de durete mesurees. CONCLUSIONS Dans cette etude nous avons montre l1influence de 1'azote dans le traitement de carbonitruration. Lorsque le taux d'interstitiels total est superieur a 0,9 % environ, les atomes d'azote provoquent le rejet des atomes de carbone de l'austenite.

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Advances in Surface Treatments. Technology–Applications–Effects by A. Niku-Lari

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