GH710

HuaNickel GH710 is a Ni-Cr-Co-based precipitation-hardened deformed superalloy that can also be used as a casting alloy with operating temperatures up to 980°C. The alloy has high strength, high sulfur corrosion resistance, oxidation resistance and good microstructure stability below 900°C. Turbine rotor blades and chucks can be manufactured, as well as integral gas turbine rotors.

GH710 Chemical composition：

	Ni	Cr	Co	W	Mo	AI	Ti	B	C	Fe	Zr	Ce	Si	Mn	S
Min	Bal	16.5	13.5	1	2.5	2	4.5	0.01	≤
Max		19.5	16	2	3.5	3	5.5	0.03	0.1	1	0.06	0.02	0.15	0.15	0.01

GH710 Physical properties:

Density	8.08g/cm³
Melting point	1245℃±15℃
Magnetic properties	not

Coefficient of linear expansion

θ/℃	20～100	20～200	20～300	20～400
α/(10-*℃-1)	11.50	12.12	12.64	13.08
0/℃	20～500	20～600	20～700
α/(10-5℃-1)	13.44	13.91	14.41

Resilient performance

θ/℃	25	100	200	300	400
Ed/GPa	227	225	219	214	208
θ/℃	500	600	700	800	一
Ed/GPa	201	194	186	179

GH710 Mechanical properties：

Standard number

Variety

Heat treatment

Room temperature performance

θ/℃

smoothLong-lasting performance

notchLong-lastingperformance

σb/MPa

σp0.2/MPa

δ₅/%

ψ/%

HV

σ/MPa

τ/h

δ₅/%

σ/MPa

τh/h

HB 5423

Cake blanks forging

Standard heat treatment

≥980

≥815

≥4.0

Measured

≥370

815

—

—

—

420

≥30

980

120

≥30

≥5

—

GH710 Alloy properties：

After long-term aging, the plasticity at high temperature, tensile strength and yield strength at room temperature decreased significantly. The higher the aging temperature, the greater the decrease, but the change in high temperature intensity is smaller. After long-term aging at 850°C and 950°C, the cold and hot fatigue life of the alloy is significantly reduced due to the precipitation of needle σ phase. After long-term aging at 850°C, the material can recover 90% of its lifespan and its durability plasticity can be restored to its original level after reheat treatment.

GH710 Uses of alloys：

HuaNickel GH710 alloy is widely used in aviation, aerospace, energy and other fields. GH710 alloy has been used in the manufacture of integral turbine disks for turboshaft engines, which are used in helicopters and oilfield generators.

GH710 Process performance：

Heat treatment: There are two available temperatures for the first solution of deformed alloy parts: 1170°C±10°C or 1150°C±10°C. The last three phases are the same as Variety’s Standard heat treatment regime. The grain size of the alloy treated by the former is coarse and the latter is fine, and the performance related to grain size is affected. When the parts are heated for heat treatment, the temperature should be slowly and evenly heated, and the staged heating method is usually used to raise the temperature, and the solution treatment temperature should be strictly controlled to ensure the quality.

Surface treatment: The alloy is protected by argon when annealing to eliminate surface residual stress; Surface shot peening and electropolishing can be carried out. In order to ensure the safe and reliable use of parts, attention should be paid to the integrity of the surface.

Cutting: The cutting performance of the alloy is poor, which is about twice as different as that of GH4033 alloy.

Relevant standards：

GB/T 14992、HB/Z140  、HB5423  GH710