Super Alloy D-979 is stocked by 1 North American distributors and produced by 0 large mills. Distributors will offer small quantity buys while mills will generally only sell large quantities, with delivery times anywhere from 10 to 50 weeks depending on size and form required
This material is stocked primarily in Casting Products by 1 distributors.
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Specifications
The following specifications cover Super Alloy D-979
No Specifications.
Property Results
Chemistry Data : [top]
Aluminum
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Boron
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Carbon
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Chromium
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Iron
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Manganese
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Molybdenum
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Nickel
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Balance |
Silicon
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Titanium
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Tungsten
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Principal Design Features
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A complex chemistry nickel-chromium-molybdenum-tungsten alloy with precipitation hardening additions.
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Applications
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Gas turbine hot section components for high strength at high temperatures.
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Machinability
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Conventional machining techniques used for iron based alloys may be used. This alloy does work-harden during machining and has higher strength and "gumminess" not typical of steels. Heavy duty machining equipment and tooling should be used to minimize chatter or work-hardening of the alloy ahead of the cutting.
Most any commercial coolant may be used in the machining operations. Water-base coolants are preferred for high speed operations such as turning, grinding, or milling. Heavy lubricants work best for drilling, tapping, broaching or boring.
Turning: Carbide tools are recommended for turning with a continuous cut. High-speed steel tooling should be used for interrupted cuts and for smooth finishing to close tolerance. Tools should have a positive rake angle. Cutting speeds and feeds are in the following ranges:
For High-Speed Steel Tools For Carbide Tooling
Depth Surface Feed Depth Surface Feed
of cut speed in inches of cut speed in inches
inches feet/min. per rev. inches feet/min. per rev.
0.250" 25-35 0.030 0.250" 150-200 0.020
0.050" 50-60 0.010 0.050" 325-375 0.008
Drilling: Steady feed rates must be used to avoid work hardening due to dwelling of the drill on the metal. Rigid set-ups are essential with as short a stub drill as feasible. Heavy-duty, high-speed steel drills with a heavy web are recommended. Feeds vary from 0.0007 inch per rev. for holes of less than 1/16" diameter, 0.003 inch per rev. for 1/4" dia., to 0.010 inch per rev. for holes of 7/8"diameter.
Milling: To obtain good accuracy and a smooth finish it is essential to have rigid machines and fixtures and sharp cutting tools. High-speed steel cutters such as M-2 or M-10 work best with cutting speeds of 30-40 feet per minute and feed of 0.004"-0.006" per cutting tooth.
Grinding: The alloy should be wet ground and aluminum oxide wheels or belts are preferred.
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Forming
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This alloy has good ductility and may be readily formed by all conventional methods. Because the alloy is stronger than regular steel it requires more powerful equipment to accomplish forming. Heavy-duty lubricants should be used during cold forming. It is essential to thoroughly clean the part of all traces of lubricant after forming as embrittlement of the alloy may occur at high temperatures if lubricant is left on.
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Heat Treatment
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Solution anneal at 1900 F and oil quench. Precipitation harden at 1550 F for 6 hours, air cool and then 1300 F for 16 hours and air cool.
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Cold Working
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Cold forming may be done using standard tooling although plain carbon tool steels are not recommended for forming as they tend to produce galling. Soft die materials (bronze, zinc alloys, etc.) minimize galling and produce good finishes, but die life is somewhat short. For long production runs the alloy tool steels ( D-2, D-3) and high-speed steels (T-1, M-2, M-10) give good results especially if hard chromium plated to reduce galling.
Tooling should be such as to allow for liberal clearances and radii. Heavy duty lubricants should be used to minimize galling in all forming operations.
Bending of sheet or plate through 180 degrees is generally limited to a bend radius of 1 T for material up to 1/8" thick and 2 T for material thicker than 1/8".
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Annealing
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Solution anneal at 1900 F for at least one hour and oil quench.
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Hardening
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See "Heat Treat".
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Physical Data : [top]
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Density (lb / cu. in.)
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0.296
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Specific Gravity
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8.25
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Specific Heat (Btu/lb/Deg F - [32-212 Deg F])
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0.11
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Thermal Conductivity
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87
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Mean Coeff Thermal Expansion
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7.6
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Modulus of Elasticity Tension
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30
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Mechanical Data : [top]
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MSO currently has no data available for this grade.
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Videos :
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MSO currently has no videos available for this grade.
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Disclaimer
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This publication may include technical inaccuracies or typographical errors. Changes may be periodically made to the information herein.
