Spring Design Considerations - Effect of Heat Treatment on Modulus of Rigidity and Damping Decrement in Torsion of Cold Drawn Wire

Effect of Heat Treatment on Modulus of Rigidity and Damping Decrement in Torsion of Cold-Drawn Wire

(All results from torsion pendulum at about 1 cps)

Size, in.	Condition	Modulus of Rigidity, 10³ksi	Damping Decrement in Torsion x 10^-4
0.037	No.1 Temper	10.5	12.3
0.037	No. 1 Temper+ 1350°F/16 hr	10.95	6.01
0.037	No. 1 Temper+ 2100°F/2 hr, A.C.+ 1550°F/24 hr, A.C.+ 1300°F/20 hr, A.C	11.91	10.06
0.149	1900°F+C.D.15%+1350°F/16 hr, A.C.	11.21	9.12
0.149	2000°F+C.D.15%+1350°F/16 hr, A.C.	11.24	7.16
0.149	1900°F+C.D.15%+2100°F/2 hr, A.C.,+ 1550°F/24 hr, A.C.,+1300°F/20 hr,A.C.	11.77	6.66
0.149	2000°F+C.D.15%+2100°F/2 hr, A.C.+ 1550°F/24 hr, A.C.+1300°F/20 hr, A.C.	11.8	4.79
0.149	2100°F+C.D.15%+2100°F/2 hr, A.C.+ 1550°F/24 hr, A.C.+1300°F/20 hr, A.C.	11.8	4.75
0.149	Annealed + 65% Reduction	10.07	8.89

After heat treatment, alloy X-750 springs will have a thin oxide coating. This oxide is beneficial in aiding resistance to many corrosive environments and need not be removed. Pickling after precipitation treating may cause an acid attack on the grain boundaries or result in pitting.

Removing the oxide by mechanical means lowers relaxation resistance.

When possible, springs should be used with the oxide on. If they must be cleaned, treatment in a reducing bath (sodium hydride) followed by water quenching and rinsing gives a good surface.

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Inconel X-750 Springs

Spring Design Considerations - Effect of Heat Treatment on Modulus of Rigidity and Damping Decrement in Torsion of Cold Drawn Wire

Effect of Heat Treatment on Modulus of Rigidity and Damping Decrement in Torsion of Cold-Drawn Wire

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