Conclusions
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1.
The addition of 5% Cr to Fe−Ni−Ti alloys lowers Ms, which substantially broadens the temperature range for aging of the alloys without danger of α phase being formed or of heterogeneous decomposition in grain boundaries.
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2.
The strength characteristics of the Fe−Ni−Cr−Ti alloys resulting from aging are 40–60% higher than for similar alloys without chromium, with no change of the ductility in either case.
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3.
The combination of aging and plastic deformation strengthens Fe−Ni−Cr−Ti alloys more than the alloys without chromium. With optima conditions of the combined treatment it is possible to obtain high strength characteristics for Fe−Ni−Cr−Ti alloys (σb = 135−165 kg/mm2, σ0.2 = 125−145 kg/mm2), without formation of ferromagnetic phase.
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4.
The elongation of Fe−Ni−Cr−Ti alloys after the combined thermomechanical treatment is considerably lower than for similar alloys without chromium, which is due to the absence of the γ»α transformation during tensile tests.
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Literature cited
K. A. Malyshev and A. I. Uvarov, "Increase in strength during aging of austenitic steels", Metal. i Term. Obrabotka Metal., 7, 52–55 (1971).
Additional information
Institute of Physics of Metals, Academy of Sciences of the USSR. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 11, pp. 11–16, November, 1974.
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Malyshev, K.A., Uvarov, A.I. Mechanical properties of N27T3 alloys with chromium. Met Sci Heat Treat 16, 916–919 (1974). https://doi.org/10.1007/BF00663794
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DOI: https://doi.org/10.1007/BF00663794