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Alloy 625 has been used often in applications which take advantage of its fatigue resistance. The factors which influence fatigue resistance of alloy 625 sheet material at room temperature including composition, cold-work, and grain size have been examined. In particular, the properties of the UNS NO6626 alloy (restricted composition for bellows applications per AMS 5879) will be compared to UNS NO6625 (AMS 5599) and to material produced according to US Patent 4,765,956[11. Data show that UNS NO6626 alloy sheet exhibits similar performance to that of UNS NO6625 alloy sheet. Either of these materials can be at least as fatigue resistant as material produced with the patent teachings. Superalloys 718,625,706 and Various Derivatives

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Nickel Alloy 22, UNS N06022, is being evaluated for use as the material of construction in permanent containers for spent nuclear fuel in Yucca Mountain, NV. To meet nuclear design criteria, Charpy impact data were required for the N06022 plate material, but conventional full-size specimens exceed the energy capacity of typical 400 J impact test machines, which results in stopping the pendulum during the test. Half-size specimens break with about 40% of the machine energy capacity, but their use raises questions concerning energy scaling to full size equivalent data. To address this, a range of subsize specimens were tested at room temperature using a standard 400 J impact test machine, and full-size, 3/4-size, and 2/3-size specimens were tested on a high energy capacity, 950J machine. Additional tests were performed at temperatures ranging from -196 to +200°C. Impact energy and lateral expansion measurements for the various test conditions are presented, their implications are examined, and a new model for absorbed energy correlation between subsize specimens and full size conventional Charpy specimens is proposed.