| Abstrakt: |
1.Calorizing of the ÉI867, ÉI929, and ZhS6K alloys at 850–1100°C for 2–8 h leads to the formation of a surface layer which considerably increases the resistance of these alloys to oxidation.2.The thickness of the layer, the incease in weight, the heat resistance, and the hardness of the three calorized alloys are the same.3.Calorizing of nickel alloys leads to an increase in the weight of the sample. The change in weight per unit surface and the depth of the layer as a function of temperature and saturation time are interdependent.4.The calorized layer has a higher microhardness than the base metal. The hardness of the first zone is H 700–850, of the second is H 700–800, and of the base metal is H 400-350. Annealing at 750°C decreases the microhardness of the first zone from H 770 to H 600 after 2 h and from H 770 to H 500 after 5 h. The hardness of the second zone remains the same.5.Calorizing of the ÉI867, ÉI929, and ZhS6K alloys at 950°C for 4 h has no effect on the mechanical properties at room temperature or at high temperature (prolonged exposure to high temperature, fatigue resistance, tensile strength, and ductility). |
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