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MP159
product details

GH159

overview

GH159 alloy is a new type of high-strengthmultiphase cobalt-based superalloy developed on the basis of foreign multiphasecobalt-based superalloys (MP alloys). Its main characteristics are: firstly,cold deformation induces cross-network-like distribution of flake ε phase inthe face-centered cubic matrix to prevent the long-range movement ofdislocations to produce strengthening, and then after aging treatment, thedispersed Ni3X phase is precipitated to supplement the strengthening. The alloyhas comprehensive properties such as ultra-high strength, good plastictoughness and high stress corrosion resistance, and can still maintain its highstrength characteristics at a high temperature of 650°C. The alloy can bewidely used not only for parts such as high-temperature fastening bolts ofaeroengines, but also for ultra-high-strength fasteners for aircraft that areused in stress corrosion environments (such as marine atmosphericenvironments). The main varieties supplied are cold drawn bars.

1.1 Materialdesignation: GH159.

1.2 Similar grade: MP159 (USA).

1.3 Technicalstandards of materials     

Q/6S 992-1992 "GH159 alloy cold drawnbar for high temperature fasteners"

C3S 284-1993 "High temperature fastenerGH159 alloy cold drawn bar"

Xie Shang Wu Gao 28-1993 "HighTemperature Fastener GH159 Alloy Cold Drawn Bar"

1.4 Chemicalcomposition%

C

Cr

Ni

Co

Mo

Fe

Ti

≤0.04

18~20

Balance

34~38

6~8

8~10

2.5~3.25

Al



Mn

Si



no greater than

0.1~0.3

0.25~0.75

0.03

0.20

0.20

0.02

0.01

1.5 Heat treatmentsystem: Solution treatment 1040~1055℃, 4~8h, water cooling + 48%±1% colddrawing deformation at room temperature + aging treatment 650~675℃, 4~4.5h, air cooling.

1.6 Type,specifications and delivery status: Cold drawn bars ofd5~25mm can be supplied, and the delivery status iscold drawn.

1.7 Melting andcasting process: Adopt the dual production process ofvacuum induction and vacuum arc remelting.

1.8 Applicationoverview and special requirements: The alloy is mainlyused for fasteners of aero-engines, with stable performance at 600 ℃   for a long time. It is currently the bestaero-engine fastener material with the best overall performance.

The alloy is mainly strengthened by colddeformation induced a large number of ε phases distributed in a network.Therefore, the process parameters of cold drawing deformation must be strictlycontrolled. If the amount of deformation is too small, the strength isinsufficient; if the amount of deformation is too large, the strength willincrease, but the plasticity will decrease. Practice has proved that the alloyhas better overall performance when the amount of cold deformation iscontrolled.

2. Physical andchemical properties     

2.1 Thermal performance                                         

2.1.1 Melting temperature range: Themelting point is 1318 ℃.

2.1.2 Thermal conductivity  

θ/℃

100

200

300

400

500

600

700

800

λ/(W/m·℃)

Cold drawn state

11.3

14.1

15.6

17.4

19.1

21.0

23.0

24.6

Cold drawn + aging state

11.0

13.8

15.3

17.1

18.6

20.5

21.0

-

2.1.3Coefficient of linear expansion (cold drawing + aging state).

θ/℃

25~100

25~200

25~300

25~400

25~500

25~600

25~700

25~800

α/10-6℃-1

14.3

14.2

14.2

14.6

14.9

15.1

16.0

18.2

    2.2 Densityρ=8.33g/cm3


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