GH4738
Descrição
Âmbito de fornecimento para o Aviation Group
Forjados, varões redondos, chapas de aço, anéis, tubos sem costura, chapas de aço/cintas de aço, materiais de soldadura de arame, bem-vindo ao inquérito!
1. Introduction to GH4738 Materials
GH4738 is a nickel-based high-temperature alloy strengthened by γ’ phase precipitation. It has good gas corrosion resistance, high yield strength and fatigue properties, good process plasticity and stable structure. It is widely used in rotating parts of aircraft engines, and the operating temperature is not higher than 815℃. Cold-rolled and hot-rolled sheets, pipes, strips, wires and forgings, castings, and fasteners can be produced.
GH4738 standard implementation
GJB 1953-1994 "Especificações sobre varões laminados a quente de ligas de alta temperatura para peças rotativas de motores aeronáuticos"
GJB 2611-1996 "Especificações para hastes de tração a frio para ligas de alta temperatura para a aviação"
GJB 2612-1996 "Especificações para estiramento a frio de ligas de alta temperatura para soldadura"
GJB 3020-1997 "Especificações para anéis de liga de alta temperatura para a aviação"
GJB 3165-1998 "Especificações sobre varões laminados a quente e forjados para peças de carga para a aviação"
GJB 3782-1999 "Especificações para varões de liga de alta temperatura para a aviação"
HB 5198-1982 "Varetas deformadas de ligas de alta temperatura para lâminas de aviação"
2. Chemical composition of GH4738
| liga | % | C | Cr | Em | Co | Mo | Al | De | B | Zr | Fe | Mn | E | P | S | Cu |
| Gh4738 | Valor mínimo | 0.03 | 18 | Permanecer
quantidade |
12 | 3.5 | 1.2 | 2.75 | 0.003 | 0.02 | – | – | – | – | – | – |
| Valor máximo | 0.10 | 21 | 15 | 5.0 | 1.6 | 3.25 | 0.010 | 0.08 | 2.0 | 0.10 | 0.15 | 0.015 | 0.015 | 0.10 |
Note: The trace impurities are ω(Pb)≤0.001%, ω(As)≤0.0025%, ω(Sn)≤0.0012%, ω(Sb)≤0.0025%, and ω(Bi)≤0.0001%.
3. GH4738 physical properties
| densidade | 8.22g/cm3 |
| Ponto de fusão | 1330-1360 ℃ |
| magnético | Non-magnetic |
Condutividade térmica
| I/℃ | 360 | 460 | 545 | 640 | 770 | 855 | 985 |
| λ/（W/（m·C）） | 16.8 | 18.3 | 20.2 | 22.4 | 24.1 | 25.3 | 28.0 |
Capacidade térmica específica
| I/℃ | 360 | 460 | 545 | 640 | 770 | 855 | 985 |
| c/（J/（kg·C）） | 515 | 540 | 573 | 603 | 640 | 665 | 707 |
Coeficiente de expansão linear
| I/℃ | 20～100 | 20～200 | 20～300 | 20～400 | 20～500 | 20～600 | 20～700 | 20～800 | 20～900 |
| A/10-6C-1 | 12.47 | 12.73 | 13.04 | 13.53 | 13.97 | 14.47 | 15.05 | 15.68 | 15.95 |
IV. Chemical properties of GH4738
Oxidation rate of antioxidant alloy after 100 hours of test in air medium
| Test time/h | 900 | 1000 |
| Oxidation rate/(g/(m2.h)) | 0.083 | 0.226 |
Corrosion resistance alloy has good corrosion resistance against salt spray.
V. GH4738 process performance and requirements
1) The forging temperature of the alloy is easy to form between 1220 and 950℃. The alloy is subjected to solid solution treatment after the vigorous forming process.
2) The average grain size of the alloy is closely related to the degree of deformation of the forging and the final forging temperature.
3) The alloy has good welding properties and can be carried out in various welding. Aging treatment after welding can obtain strength approximately in a complete heat treatment state.
4) The heat treatment of parts is carried out in a neutral or reducing atmosphere without sulfur to avoid vulcanization.
6. GH4738 application fields
This alloy is widely used in aircraft engine gas turbines in China, mainly used as rotating parts such as turbine blades and turbine discs, and has mature experience in using it.
