| Autor: |
Kabanov, I. V., Mel'kumov, I. N., Mochalova, T. B., Maslenkov, S. B., Maslenkova, E. A. |
| Zdroj: |
Metal Science and Heat Treatment; June 1990, Vol. 32 Issue: 6 p440-444, 5p |
| Abstrakt: |
Conclusions 1.Heat treatment in air of heat-resistant alloys alloyed only with aluminum is unavoid-ably accompanied by the loss of C, B, Cr, and Al. The degree of burning-off of Cr and Al is insignificant, while the concentration of C and B in the surface layer decreases 2.5- and 20-fold, respectively. The thickness of the zone depleted in boron after the standard regimen of heat treatment is 3–4 mm.2.Loss of carbon and boron is accompanied by increase in the concentration of nitrogen and oxygen in the surface layer, and the appearance of µ-phase.3.Depletion of alloying elements in the surface layer leads to grain coarsening, and lowering of the mechanical properties.4.Heat treatment in vacuum guarantees the preservation of a uniform grain structure throughout the entire cross section of the specimen.5.Heat treatment of heat-resistant nickel alloys alloyed only with aluminum must be carried out under conditions which prevent the burning-out of alloying elements, i.e., in vaccum or inert atmosphere. |
| Databáze: |
Supplemental Index |
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