Spring Design Considerations - Effect of Heat Treatment on Modulus of Rigidity and Damping Decrement in Torsion of Cold Drawn Wire - Inconel 718 Springs

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Effect of Heat Treatment on Modulus of Rigidity

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  1. Spring Design Considerations
  2. Design stresses for helical springs at Elevated Temperatures
  3. Design stresses for flat springs at Elevated Temperatures
  4. Specifications for Spring Wire
  5. Room-Temperature Properties of Inconel Alloy X750 Wire for No. 1 Temper
  6. Room-Temperature Properties of Inconel Alloy X750 Wire for Spring Temper
  7. Room-Temperature Shear Properties of Inconel Alloy X750 Springs
  8. Relaxation of springs cold-coiled from No. 1 Temper wire
  9. Relaxation of springs cold-coiled from triple-heat-treated Spring Temper wire
  10. Relaxation at 1000°F vs time of Spring-Temper, triple-heat-treated springs
  11. Relaxation at 1100°F of Spring-Temper, triple-heat-treated springs
  12. Relaxation at 1200°F vs time of Spring-Temper, triple-heat- treated springs
  13. Relaxation at 1300°F of Spring-Temper, triple-heat-treated springs
  14. Fatigue strength of cold-rolled Spring-Temper strip
  15. Effect of Heat Treatment on Modulus of Rigidity and Damping Decrement in Torsion of Cold-Drawn Wire
 

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 718

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Spring Design Considerations - Effect of Heat Treatment on Modulus of Rigidity and Damping Decrement in Torsion of Cold Drawn Wire - Inconel 718 Springs
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