Conclusions
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1.
Three stages of aging are observed in cast maraging steel Kh14K9N6M5 quenched to martensite and retained austenite. In the first state (up to 550°) martensite decomposes into two solid solutions — ferromagnetic, rich in iron, and nonferromagnetic, rich in chromium, with highly dispersed R phase in the latter. In the second state (550°, 3–50 h) the two solid solutions and R phase that can be detected in powder patterns are retained. In the third stage only the intermetallic R phase is precipitated (at temperatures 600 and 550° for 100 h).
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2.
The highest strength corresponds to decomposition of the solid solution with formation of α phase rich in chromium and with highly dispersed R phase in it.
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Additional information
All-Union Scientific-Research Institute of Aviation Materials. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 39–42, October, 1974.
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Lashko, N.F., Zaslavskaya, L.V., Nikol'skaya, V.L. et al. Phase composition, structure, and properties of maraging steel Kh14K9N6M5. Met Sci Heat Treat 16, 856–859 (1974). https://doi.org/10.1007/BF00664252
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DOI: https://doi.org/10.1007/BF00664252