phone-icon800.354.0806
765.456.6012
The Home of HASTELLOY® and
HAYNES® Alloys

Fatigue Properties

Strain-Controlled LCF Properties (Hot-Rolled Plate)

The following LCF properties were generated from hot-rolled and fully heat-treated plate. Testing was performed in the transverse direction utilizing a smooth, round bar specimen geometry. The specimens were tested by fully reversed axial strain cycling, R-ratio of -1.0, and a cycle frequency of 20 cpm (0.33 Hz) at a strain range of 1%.

Cycles to Failure at 1200°F (650°C), NF
242®
X
188
HR-120®
2000
4000
2100
3600

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.

Print Page
Back to top