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), N_F

HAYNES^® 242^® alloy	HASTELLOY^® X alloy	HAYNES 188 alloy	HAYNES HR-120^® alloy

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 (K_t=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), N_F

Ksi	MPa	242^® alloy	Alloy 909

110	760	845	2,835
100	690	12,220	22,568
95	655	32,587	13,796
90	620	76,763	59,679;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.

Haynes International, Inc. 800-354-0806 765-456-6012

HAYNES® 242® alloy Information

An age-hardenable Ni-Mo-Cr alloy that combines high-temperature strength, low thermal expansion characteristics and good oxidation-resistance for service to 1400°F (760°C). Also resistance to high-temperature fluorine and fluoride environments.

HAYNES^® 242^® alloy Information

An age-hardenable Ni-Mo-Cr alloy that combines high-temperature strength, low thermal expansion characteristics
and good oxidation-resistance for service to 1400°F (760°C). Also resistance to high-temperature fluorine and fluoride environments.