ISSN:
1573-8973
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions 1. Diffusion coating of heat resistant alloys with aluminum leads to complex changes in the concentration of elements in the diffusion zone. In iron-base alloys the concentrations of iron and chromium in the intermetallic zone decrease sharply, while the amount of nickel increases sharply near the boundary of the intermetallic zone with the mixed zone. In the nickel-base alloy the amount of nickel decreases and also that of chromium, molybdenum, cobalt, and tungsten. The amount of aluminum in the coating on iron-base alloys is higher than for the nickel-base alloy (25–35% and 20–25% respectively). 2. The principal phases in the coating on iron-base alloys are phases with varying concentrations of aluminum \3- FeAl, Fe3Al; the principal phases in coatings on a nickel alloy are NiAl and Ni3Al. As the aluminum concentration decreases from the surface into the depth of the diffusion coating the FeAl phase transforms to Fe3Al, with a zone in which both phases exist. 3. After testing at 1000\dgC the concentration of aluminum at the surface and in the diffusion zone decreases due to redistribution of aluminum to lower depths. The distributions of other alloying elements and types of phases in the intermetallic (outer) zone remain the same.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00651784
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