By A. Niku-Lari
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1: . . -' ; ■ ;! · it ... _ 1 ^- ΞΞΞ J. ' i l . . 1- t k~: LJf \k %A 3fc" -"-- j j „ ! 4... :':'. f — -— i , l - j 1- 1 ! X ll\ l- Ί, l 1J - Ü3 Fig. 12. X-ray diffractogram (obtained by Cr - K^c radiation) of plasma nitrided surface layer of crankshaft material : 18h at 490 C in 70*N2 + 30*Ha gas mixture at 3mbar. Dynam ical strength is the indica tor of t he r esis tance against fl uctu ating part fr acture in the stress the struc tural condi tions. It is most prec isely ob tain ed a t va ryin g stres ses by part.
5 Fig. 2. P. et le % N pour 3 traitements de carbonitruration (acier 27CD4) On observe une saturation lorsque la teneur en azote est voisine de 0,3 7o, cette invariance de MS avec la teneur en azote, ä teneur en carbone quasi constante, peut s'interpreter par une saturation de I'austenite en elements interstitiels qui la stabilise. A ce stade, on peut emettre les hypotheses suivantes : 1. L'azote entre en combinaison avec le chrome pour former des nitrures ou des carbonitrures; cependant nous n'avons pratiquement pas observe ce type de precipites pour les echantillons etudies.
4. By regulating the process parameters of plasma nitriding it is possible to obtain the required t" o r E monophase compound layer on diffused nitrided layer or diffused nitrided layer only, which is impossible in the gas nitriding process. 5. For the specified temperature of nitriding, it is necessery to determine the optimal process duration; the fatigue strength is not increased in the same relation with the increase of the nitriding duration. We have found that fatigue resistance maximum values were obtained for a certain optimum nitriding time which was understandable from the aspect of nitride precipitates formation.