Conclusions
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1.
The concentration of aging initiators and the treatment have a considerable effect on the relaxation resistance of precipitation-hardening Fe−Ni alloys. The optimal concentration of aging initiators (Ti and Al) in Fe−Ni alloys depends on the parameters of the treatment and the operating conditions (operating temperature and stress level).
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2.
The optimal concentration of titanium ensuring the highest low-temperature and moderate-temperature relaxation resistance of Fe−Ni alloys is 2.5–3.2% after DHT and 1.0–2.2% after MTT.
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3.
Aluminum replacing titanium in Fe−Ni alloys effectively increases the low-temperature and moderate-temperature relaxation resistance of bands subjected to DHT and the low-temperature relaxation resistance of bands subjected to MTT, and weakens the dependence of the relative stress relaxation on the parameters of MTT and the initial stress.
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Literature cited
A. G. Rakhshtadt, Spring Steels and Alloys [in Russian], Metallurgiya, Moscow, (1971).
Precision Alloys. Handbook [in Russian], Metallurgiya, Moscow (1974), p. 351.
A. M. Tseitlin and V. Ya. Zubov, in: Relaxation Phenomena in Solids [in Russian], Metallurgiya, Moscow (1968), p. 267.
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B. Clark and F. Pickering, J. Iron Steel Inst.,205, 70 (1967).
Additional information
Ural Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 43–45, December, 1978.
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Khomenko, O.A., Sazykina, A.V. Effect of titanium and aluminum on the relaxation resistance of austenitic Fe−Ni alloys. Met Sci Heat Treat 20, 1011–1014 (1978). https://doi.org/10.1007/BF00703279
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DOI: https://doi.org/10.1007/BF00703279