GH4738
الوصف
نطاق التوريد لمجموعة الطيران
المطروقات، والقضبان المستديرة، والألواح الفولاذية، والحلقات، والأنابيب غير الملحومة، والألواح الفولاذية/الأحزمة الفولاذية، ومواد لحام الأسلاك، مرحبًا بكم للاستفسار!
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 “Specifications on Hot Rolled Rods for High Temperature Alloys for Rotating Parts of Aero Engines”
GJB 2611-1996 “Specifications for Cold Pulling Rods for High Temperature Alloys for Aviation”
GJB 2612-1996 "مواصفات السحب على البارد للسبائك ذات درجة الحرارة العالية للحام"
GJB 3020-1997 "مواصفات فواتير سبائك السبائك الحلقية ذات درجة الحرارة العالية للطيران"
GJB 3165-1998 "مواصفات قضبان الدرفلة على الساخن والقضبان المطروقة لأجزاء تحميل الطيران"
GJB 3782-1999 “Specifications for High Temperature Alloy Rods for Aviation”
HB 5198-1982 “Deformed high-temperature alloy rods for aviation blades”
2. Chemical composition of GH4738
| سبيكة | % | C | كر | في | شركة | مو | آل | من | B | Zr | في | من | و | P | S | النحاس |
| Gh4738 | الحد الأدنى للقيمة | 0.03 | 18 | Remain
quantity |
12 | 3.5 | 1.2 | 2.75 | 0.003 | 0.02 | – | – | – | – | – | – |
| القيمة القصوى | 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
| الكثافة | 8.22g/cm3 |
| نقطة الانصهار | 1330-1360 ℃ |
| مغناطيسي | غير مغناطيسية |
التوصيل الحراري
| 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 |
السعة الحرارية النوعية
| I/℃ | 360 | 460 | 545 | 640 | 770 | 855 | 985 |
| c/（J/（kg·C）） | 515 | 540 | 573 | 603 | 640 | 665 | 707 |
معامل التمدد الخطي
| 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 |
مقاومة التآكل 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.
