Haynes 244

Source：http://www.zytcsteel.com Time：2023/3/11 16:17:31 View：

HAYNES 244 alloy is a new Ni-Mo-Cr-W alloy developed for static parts in advanced gas turbine engines which require low thermal expansion at temperatures up to 1400°F (760°C). It offers a higher maximum use temperature than other low thermal expansion alloys currently available, including a 100-200°F (55-110°C) improvement over HAYNES 242 alloy. The alloy is age-hardenable by formation of Ni2 (Cr,Mo,W) domains, which are structurally similar to the strengthening domains in 242 alloy. Judicious alloying with tungsten increased the thermal stability of these domains and lowered the coefficient of thermal expansion. Other important properties such as oxidation resistance and low-cycle fatigue performance are comparable or better than those of 242 alloy.

Chemical Composition:

Nickel:	Balance
Aluminum:	0.5 max.
Carbon:	0.03 max.
Chromium:	8
Iron:	2 max.
Manganese:	0.8 max.
Molybdenum:	22.5
Tungsten:	6

Heat Treatment:

HAYNES 244 alloy is furnished in the annealed condition, unless otherwise specified. The alloy is usually annealed in the range of 2000-2100°F (1093-1149°C), depending upon specific requirements, followed by an air cool (or more rapid cooling) before aging. A water quench is recommended for heavy section components. Aging is performed by holding at 1400°F (760°C) for 16 hours, furnace cooling to 1200°F (649°C) and holding for 32 hours, followed by air cool.

Mechanical Properties:

Test Temperature		Yield Strength, 0.2% Offset		Ultimate Tensile Strength		Elongation	Reduction of Area
°F	°C	ksi	MPa	ksi	MPa	%	%
RT	RT	121.2	836	195.0	1345	34	37
200	93	116.3	802	190.3	1312	39	41
400	204	110.3	761	181.6	1252	39	45
600	316	107.9	744	175.4	1209	41	44
800	427	100.0	689	170.4	1175	41	46
1000	538	99.3	685	164.2	1132	38	43
1100	593	97.5	672	156.3	1078	32	32
1200	649	93.8	647	141.4	975	21	24
1300	704	84.8	585	125.6	866	18	20
1400	760	67.2	463	105.0	696	44	37
1500	816	37.1	256	72.0	463	106	70
1600	871	34.8	240	54.1	354	124	84
1700	927	38.2*	263*	42.4*	208*	161*	89*
1800	983	24.0	165	30.4	210	141	94

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