Fe-Cr-Ni-Si shape memory alloys with excellent stress corrosion

Metal treatment – Stock – Mechanical memory

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420 50, 420 51, C22C 3846, C22C 3848, C22C 3850

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active

052445135

ABSTRACT:
Ferrous group shape memory alloys consisting essentially of Cr: 16.0-21.0 wt %, Si: 3.0-7.0 wt % and Ni: 11.0-21.0 wt % and satisfying Ni wt %.gtoreq.[0.67.times.{Cr+1.2.times.(Si+Ti+Zr+Hf+V+Nb+Ta)}-] wt % and (Cr+Si) wt %.gtoreq.20 wt %, these ferrous-group shape-memory alloys having a corrosion resistance, a shape-memorizing properties, an intergranular corrosion resistance and a stress corrosion cracking resistance in nitric acid for nuclear fuel reprocessing plants and high-temperature, high-pressure water for light-water reactors.

REFERENCES:
C. W. Wegst, "Stahlschlussel, 15, Auglage". Verlan Stahlschlussel Wegst GmbH, Title page and pp. 329, 336, 372, and 408 (1989).
H. Funakubo (editor), "Shape Memory Alloys", Sangyo Tosho, Jun. 7, 1984 `Applications of Shape Memory Alloys` by U. Suzuki, pp. 113-114 and 8 (Table 1).
B. E. Wilde, "Corrosion", National Association of Corrosion Engineers (NACE).
Disclosure Bulletin, vol. 42, No. 11, Nov. 1986, pp. 678-681.
Patent Abstract of Japan, 125 C 726, Jun. 8, 1990 (corres above JP,A554).
Patent Abstract of Japn, 146 C 809, Feb. 21, 1991 (corres above JP,A 514).

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