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HAYNES® Alloys

Fatigue Properties

Strain-Controlled LCF Properties (Hot-Rolled Plate)

HAYNES® 242® alloy exhibits excellent low cycle fatigue properties at elevated temperature. Results shown below are for strain-controlled tests run in the temperature range from 800 to 1400°F (425 to 760°C). Samples were machined from plate. Tests were run with fully reversed strain (R=-1) at a frequency of 20 cpm (0.33 Hz).

242 LCF Figure 

Stress-Controlled Notched LCF Properties (Hot-Rolled Rings)

The following test results were generated from hot-rolled and fully heat-treated rings destined for actual gas turbine engine part applications. Testing was performed in the tangential direction utilizing a round test bar geometry with a double notch design (Kt=2.18). Loading was uniaxial cycling with an R-ratio of 0.05 stress and a cycle frequency of 20 cpm (0.33 Hz).

Maximum Stress Cycles to Failure at 1200°F (650°C), NF
ksi MPa 242® 909
110 760 845 2,835
100 690 12,220 22,568
95 655 32,587 13,796
90 620 76,763 55,679; 40,525
85 585 297,848 47,707; 43,701
80 550 304,116* 129,573**

* No crack observed at 198,030 cycles. 8 mil (200μm) crack observed at 200,000 cycles. 
**No crack observed at 45,800 cycles. 8 mil (200μm) crack observed at 47,770 cycles.

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