GB572861A - Improvements in nickel and cobalt alloys - Google Patents

Abstract

572,861. Alloys; annealing. MOND NICKEL CO., Ltd. (International Nickel Co., Inc:). April 9, 1942, No. 4688. [Classes 72 and 82 (i)] [Also in Group XXII] An age-hardenable alloy containing at least 45 per cent of nickel, or of nickel and up to 10 per cent of cobalt, and which may contain also up to 45 per cent of iron, up to 45 per cent of chromium, up to 10 per cent of manganese, up to 8 per cent of copper, and up to 5, per cent of other elements, contains also aluminium and either silicon or titanium or both, the aluminium content exceeding the combined silicon and titanium content, and the ratio of the nickel plus cobalt content to the content of aluminium plus silicon plus twice the square root of the titanium being between 11 and 20 to 1, preferably between 13 and 17 to 1. Up to 0.5 per cent of carbon may be present. 'The alloys may be softened by quenching or rapidly cooling from over 1500‹ F. They may then be deformed cold, machined, and hardened by reheating to 1100-1500‹ F. for up to 24 hours and cooling slowly. Cold working may be applied before or after the age-hardening. Certain of the alloys may be hot-worked at 1900-2400‹ F., others at 1400-2450‹ F. According to the Provisional Specification, any two or all three of the elements aluminium, silicon and titanium may be used.