Shotaro Morozumi1 and Michio Kikuchi1
1The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai
Effect of alloying elements, Cr, Fe, Mo, Nb, Ti, V and Zr, on solution and age-hardening of Ni-Be alloys was investigated by testing hardness and tensile properties at room and high temperatures, as well as by microscopic examination of the grain-boundary reaction.
The results obtained are as follows:
(1) Solution-hardening effect of the alloying elements was correlated to a factor consisting of the atomic size and amount of the alloying elements.
(2) In Ni-low Be alloys containing less than about 1 wt% of Be, age-hardenability of the alloys was improved by the alloying.
(3) While, in Ni-high Be alloys with various amounts of the alloying elements, the maximum increment of hardness attainable by aging was not so different from alloy to alloy. However, the attainable maximum hardness by aging was improved by the alloying because of the increased hardness of solution-treated alloys.
(4) Microscopic examination showed that among the alloying elements, Ti and Nb retarded the grain-boundary reaction excellently and Mo did fairly.
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