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Effect of composition and heat treatment on the structure and properties of Fe−Ni−Be invar alloys

  • Precision Alloys
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Conclusions

Addition of Be (0.5–1%) to Fe−Ni invar alloys provides dispersion hardening after quenching and aging, with retention of a low (close to invar) value of LCTE. Increase of the Be concentration in alloy 36N is accompanied by an increase in LCTE in the quenched as well as the aged condition, and increase of the Ni concentration to 38–41% at a fixed concentration of Be leads to a decreased value of LCTE in the aged alloys, approaching that of the alloy 36N. The optimum composition range for Fe−Ni−Be alloys in which the best combination of properties can be obtained — low value of LCTE (α≅3.10−6, K−1) and higher strength (σ0.2≅910 N/mm2, σu≅1100 N/mm2) — was determined to be (39–40% Ni, 0.7–0.8% Be). The alloy 40NL (40% Ni, 0.8% Be) is proposed as a high strength invar alloy.

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Authors
  1. E. L. Svistunova
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  2. A. A. Gulyaev
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Additional information

I. P. Bardin Central Scientific-Research Institute for Ferrous Metallurgy (TsNIIChERMET). Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 33–36, February, 1992.

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Svistunova, E.L., Gulyaev, A.A. Effect of composition and heat treatment on the structure and properties of Fe−Ni−Be invar alloys. Met Sci Heat Treat 34, 128–132 (1992). https://doi.org/10.1007/BF00769880

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