The effect of molybdenum on γ′ coarsening and on elevated-temperature hardness in some experimental nickel-base superalloys |
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Authors: | V Biss D L Sponseller |
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Affiliation: | (1) Climax Molybdenum Company of Michigan, an AMAX subsidiary, Ann Arbor, Michigan |
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Abstract: | The coarsening of γ′ and the elevated-temperature hardness have been studied as a function of molybdenum content, time, and
temperature in experimental wrought nickel-base superalloys. The alloys were selected from a systematic series containing
3, 4 1/2, and 6 wt pct Al and 1 wt pct Al plus 3 1/2 wt pct Ti. Each of the aluminum (plus titanium) series consisted of four
alloys containing 0, 2, 5, and 8 wt pct Mo. The alloys were solution-treated plus aged up to 112 h at 1700°F (925°C) and up
to 1000 h at 1400°F (760°C). Molybdenum retards the coarsening of γ′ on aging; this retarding effect is most pronounced in
alloys containing 6 wt pct Al. The coarsening of γ′ particles follows Ostwald ripening kinetics. Hardness testingin vacuo at temperatures up to 1750°F (955°C) shows that molybdenum also increases the elevated-temperature hardness significantly.
The relation of elevated-temperature hardness to the volume fraction of γ′ is considered, and the influence of aluminum and
titanium contents is discussed. |
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