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V. E. Arkhipov A. A. Ablaev L. T. Krasnov M. I. Oparin V. A. Frolov 《Metal Science and Heat Treatment》1990,32(7):511-513
Conclusions Hardening with the use of light-beam heating may find practical use since it causes an increase in hardness and wear resistance of the surface of high-strength cast irons and light-beam treatment is possible both with use of absorbing coatings and without them.Repair Part All-Union Scientific and Production Union. Moscow Aviation Technology Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 34–36, July, 1990. 相似文献
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We analyze the effect of the degree of isolation of a cut point on the number of states P(U, ) of a probabilistic automaton representing the language U. We give an example of a language Un consisting of words of length n such that there exist numbers < for which P(Un, )/P(Un, )0 as n.Translated from Kibernetika, No. 3, pp. 21–25, May–June, 1989. 相似文献
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| 1. | Lowering the content of chromium and carbon in powder materials of the system Ni–Cr–B–Si reduces the proneness to cracking of built-up coatings. |
| 2. | Preliminary heating of the specimen (part) to 100–150°C eliminates almost completely the proneness to cracking of built-up coatings when the facing materials are nickel base powders of the self-fluxing class. |
| 3. | In regard to corrosion resistance built-up coatings are not inferior to galvanized chromium coatings and are better than alloy steel 38KhMYuA. Such coatings have long life even when there are cracks on the surface. |
| 4. | Built-up coatings have good seizing resistance both at room temperature and at elevated temperatures, and their wear resistance is one order of magnitude better than the wear resistance of steel 45 heat-treated to HRC 51–53. |
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