GH605 generally refers to cobalt-based superalloy
Cobalt-based superalloys are austenitic superalloys containing 40-65% cobalt. Under the condition of 730~1100, it has certain high temperature strength, good resistance to hot corrosion and oxidation. It is suitable for making guide vanes and nozzle guide vanes of aviation jet engines, industrial gas turbines, naval gas turbines, and diesel engine nozzles.
Properties
Hot corrosion and oxidation resistance
Cobalt-based superalloy is a kind of superalloy. It uses cobalt as the main component, contains a considerable amount of nickel, chromium, tungsten and a small amount of molybdenum, niobium, tantalum, titanium, lanthanum and other alloying elements, and occasionally also contains iron. a class of alloys. According to the different components in the alloy, they can be made into welding wire, powder used for hard surface surfacing, thermal spraying, spray welding and other processes, and can also be made into castings and forgings and powder metallurgy parts.
Model
Typical grades of cobalt-based superalloys are: Hayness188, Haynes25 (L-605), Alloy S-816, UMCo-50, MP-159, FSX-414, X-40, Stellite6B, etc. The corresponding grades in China are: GH5188 (GH188 ), GH159, GH605, K640, DZ40M, etc. In my country, the research on cobalt-based superalloys is relatively in-depth (the typical domestic research and promotion units are the General Iron and Steel Research Institute and Beijing Rongpin Technology Co., Ltd.). Unlike other superalloys, cobalt-based superalloys are not strengthened by ordered precipitates that are firmly bonded to the matrix, but are composed of an austenitic fcc matrix that has been solid solution strengthened and a small amount of carbides distributed in the matrix. Cast cobalt-based superalloys rely heavily on carbide strengthening. Pure cobalt crystals have a hexagonal close-packed (hcp) crystal structure below 417 °C and transform to fcc at higher temperatures. To avoid this transformation of cobalt-based superalloys when they are used, virtually all cobalt-based superalloys are alloyed with nickel to stabilize the structure in the room temperature to melting temperature range. Cobalt-based superalloys have a flat fracture stress-temperature relationship, but show superior hot corrosion resistance above 1000°C compared to other high temperatures, probably due to the high chromium content of this alloy, which is a characteristic of this class of alloys a feature of .
GH605 Cobalt Chromium Nickel Alloy
GH605 cobalt-containing nickel alloy (high temperature resistance)
Overview of the characteristics and application fields of GH605: The alloy has good comprehensive properties in the temperature range of -253 to 700 °C, the yield strength below 650 °C ranks first in the deformed superalloy, and has good performance, processing performance, and welding performance. It can manufacture various parts with complex shapes, and has been widely used in the above temperature range in aerospace, nuclear energy, petroleum industry and extrusion dies.
GH605 alloy steel, heat-resistant alloy
Executive standard: (GB/T14992-2005)
GH605 similar grades: L605, HS25, WF-11, ALS1670, UNSR30605 (USA), KC20WN (France)
Chemical composition of GH605:
Carbon C: 0.05 to 0.15
Chromium Cr: 19.00~21.00
Nickel Ni: 9.00~11.00
Cobalt Co: more
Tungsten W: 14.00~16.00
Iron Fe: ≤3.00
Silicon Si: ≤0.40
Manganese Mn: 1.00~2.00
Phosphorus P: ≤0.040
Sulfur S: ≤0.030
GH605 physical properties:
Density g/cm3: 9.13
Melting point ºC: 1330
Thermal conductivity λ/(W/m•ºC)1410
Specific heat capacity J/kg•ºC 10.5(100ºC)
Elastic Modulus GPa 377
Shear modulus GPa 231
Resistivity μΩ.m 89
Poisson's ratio 1.12
Linear expansion coefficient a/10-6ºC-1 0.286 12.9(20~100ºC)
GH605 Metallographic structure: After the alloy is aged, some carbides and intermetallic compounds can be formed, including M7C3, M23C6, M6C, a-Co3W, β-Co3W, L-Co2W and μ-Co7W6.
GH605 process performance and requirements:
1. The alloy has satisfactory cold and hot forming properties. The hot working temperature ranges from 1200 to 980 °C. The forging temperature should be high enough to reduce grain boundary carbides and low enough to control the grain size. The suitable forging temperature is about 1170°C.
2. The average grain size of the alloy is closely related to the deformation degree and final forging temperature of the forging.
3. The alloy can be connected by methods such as solution welding, resistance welding and fiber welding.
4. Alloy solution treatment: 1230ºC for forgings and bars, water cooling.
Detailed information: GH605 cobalt-based superalloy, overview of characteristics and application fields: the alloy is a cobalt-based superalloy with 20Cr and 15W solid solution strengthening, with moderate durability and creep strength below 815 °C, and excellent below 1090 °C Excellent oxidation resistance, and at the same time have satisfactory forming, welding and other process performance. It is suitable for the manufacture of hot-end high-temperature parts that require medium strength and excellent high-temperature oxidation resistance, such as aero-engine combustion chambers and guide vanes. It can also be used in aero-engines and space shuttles. Mainly used on imported models, used to manufacture high-temperature parts such as guide plates, gear outer rings, outer walls, deflectors, and sealing sheets.
Executive standard: American Society for Testing and Materials: B637, B670, B906.
American Material Specifications: AMS 5662, 5663, 5664, 5596, 5597, 5832, 5589, 5590.
American Society of Mechanical Engineers: AISI, JIS, GB, AMS, UNS, ASME, DIN, EN, VDM, SMC, AMS/
(Alloy steel) element properties list:
Nickel (Ni): Nickel increases the strength of steel while maintaining good ductility and toughness. Nickel has high corrosion resistance to acid and alkali, rust and heat resistance at high temperature. However, since nickel is a relatively scarce resource (high price), other alloying elements should be used instead of nickel-chromium steel.
Chromium (Cr): In alloy steels, chromium can significantly improve strength, hardness and wear resistance, while reducing plastic toughness. Chromium can also improve the oxygen and corrosion resistance of steel, so stainless steel is an important alloying element of heat-resistant steel.
Molybdenum (Mo): Molybdenum can refine the grains of steel, improve hardenability and thermal strength, and maintain sufficient strength and creep resistance at high temperatures (long-term stress at high temperatures, deformation occurs, called creep ). The addition of molybdenum to alloy steel can improve mechanical properties. The brittleness of alloy steel due to fire can also be suppressed. It can improve redness in tool steel.
Cobalt (Co): Cobalt is a rare precious metal used in special steels and alloys, heat-resistant strong steels and magnetic materials.
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