QQ-N-286G
cool blow 1450 F, the material should be quenched rather than be permitted to air cool below that temperature.
6.8.3 Heating requirements. With reference to the heating times shown herein, care must be taken to obtain the proper temperature throughout the cross-section on large diameters or thicknesses. Also it should be understood that material should be brought to annealing temperature or hot working temperature as rapidly as possible to avoid aging of the material on the way
up to temperature, otherwise cracking or thermal splitting of the material might occur, particularly in subsequent hot working operations.
6.8.4 Maximum forging temperature. This material is usually hot worked at a maximum temperature of 2100 F. Heating to higher temperatures could
promote excessive grain growth and oxidation.
6.9 Heat treatment guidance. There is no one prescribed heat treatment for this alloy. Times and temperatures are approximate and may be modified to account for the size, shape, microstructure and condition of the metal to be heat treated.
6.9.1 Annealing. Unheat treated material is usually solution heat
treated by the manufacturer and should not need to be solution annealed again.
If, for any reason, it is desired to soften hard material during fabrication,
this may be accomplished by holding at 1600 - 1900 F for a time commensurate with section thickness followed by water quenching. A temperature of 1900 F
should be used followed by water quenching to final anneal cold drawn rods.
For products other than cold drawn rods, a temperature of 1800 F should be used followed by water quenching for final annealed products.
6.9.2 Age hardening Aging (hardening) may be accomplished by holding the metal at 1100 - 1125 F for 8 - 16 hours followed by furnace cooling to 900 F
at a rate of 15 to 25 F per hour and then air cooling. Age hardening may also be accomplished by holding the metal at 1100 F for a period of 16 hours, furnace cooling to 1000 F, holding for a period of 6 hours, furnace cooling to
900 F, holding for a period of 8 hours, and air cooling.
6.10 This specification covers various forms of nickel-copper-aluminum alloy for the fabrication of finished components. Component specifications should be consulted for the requirements relevant to individual products.
6.11 Subject term (key word) listing.
Rods Bars Forgings Ultrasonic
6.12 Changes from previous issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extent of the changes.
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