706 Alloy

Alloy name: 706
Diagram No.: 1082
Type of diagram: TTP
Chemical composition in weight %: See the table
Alloy group: Nickel-based alloys
Note: The “on cooling ‘TTP” diagrams of three experimental alloys and Alloy 706 : (a) alloy No.2, (b) No.4, (c) No.5 and (d) Alloy 706.
Hardness of alloy No.1 changed little and hardness of alloys Nos. 3 and 6 changed a little after a long time exposure within the range of this experiment, indicating that either 0.3% aluminum or 2.5% niobium or the combination of both is insufficient for age hardening. It should be noted that alloys Nos. 3 and 6 were a little hardened in this study, that is in case of “on cooling TTH”. On the contrary, alloys Nos. 3 and 6 were not hardened in case of usual “on heating TTH”. It suggests that the rate of formation of strengthening precipitate is higher in “on cooling TTP” than in “on heating TTP”.
The titanium-free alloys were a little hardened by the heat treatment as described above, while titanium-containing alloys, namely Nos.2, 4, 5 and Alloy 706 were all age-hardenable, indicating the formation of Gamma’ and/or Gamma” phase. The “on cooling TTH” diagrams of three experimental alloys, Nos.2,4 and 5, and Alloy 706 are shown in Figure. The highest hardness was about 400 Hv in No.5 and Alloy 706, but about 300 Hv in Nos.2 and 4. The higher hardness is attributed to niobium of those alloys, suggesting a synergetic effect between niobium and titanium. This is the same effect as “on heating TTH” diagram. On the contrary, the regions of highest hardness in “on cooling TTH” diagrams were different from those in “on heating TTH” diagram. The difference between them was especially distinct for the shorter time range at low temperature in TTH diagram. This difference is considered to be due to the precipitation of Gamma’ and/or Gamma” phase during the cooling stage from the solution treatment.
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