GH4169 is a precipitation-strengthened nickel-based superalloy with good comprehensive properties in the temperature range of -253 to 650 °C. The yield strength below 650 °C ranks first in the deformed superalloy, and it has good fatigue resistance, radiation resistance and Oxidation, corrosion resistance, and good processability, good 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.
Another feature of the alloy is that the alloy structure is particularly sensitive to the hot working process. Mastering the law of phase precipitation and dissolution in the alloy and the relationship between the structure, process and performance can make reasonable and feasible process regulations for different use requirements. Get a wide range of parts for different strength levels and usage requirements. The varieties supplied are forgings, forged bars, rolled bars, cold rolled bars, round cakes, rings, plates, strips, wires, tubes, etc. It can be made into parts such as discs, rings, blades, shafts, fasteners and elastic elements, sheet metal structural parts, and casings for long-term use in aviation.
material grade
GH4169 (GH169)
Similar grades
Inconel718 (USA), NC19FeNb (France)
technical standard
GJB 2612-1996 "Specification for high temperature alloy cold drawing wire for welding"
HB 6702-1993 "GH4169 alloy bar for WZ8 series"
Q/6S 1034-1992 "GH4169 Alloy Bars for High Temperature Fasteners"
Q/3B 548-1996 "GH4169 Alloy Forgings"
Q/3B 548-1996 "GH4169 Alloy Forgings"
Q/3B 4048-1993 "YZGH4169 Alloy Bar"
Q/3B 4050-1993 "GH4169 Alloy Plate"
Q/3B 4051-1993 "GH4169 Alloy Wire"
GB/T14992-2005 "Superalloy"
chemical composition
The chemical composition of the alloy is divided into three categories: standard composition, high-quality composition, and high-purity composition, as shown in Table 1-1. High-quality components reduce carbon and increase niobium on the basis of standard components, thereby reducing the number of niobium carbides, reducing the number of fatigue sources and strengthening phases, increasing the content of anti-fatigue, and improving the purity and comprehensive properties of the material.
The GH4169 alloy for nuclear energy applications needs to control the content of boron (other elements remain unchanged). When ω(B)≤0.002%, in order to distinguish it from the GH4169 alloy used in the aerospace industry, the alloy grade is GH4169A.
Table 1-1
category
C Cr Ni Co Mo Al Ti Fe
standard ≤0.08 17.0~21.0 50~55.0 ≤1.0 2.80~3.30 0.30~0.70 0.75~1.15 Remain
high quality 0.02~0.06 17.0~21.0 50~55.0 ≤1.0 2.80~3.30 0.30~0.70 0.75~1.15 Remain
High purity 0.02~0.06 17.0~21.0 50~55.0 ≤1.0 2.80~3.30 0.30~0.70 0.75~1.15 Remain
category
Nb B Mg Mn Si P S Cu Ca
no greater than no greater than no greater than no greater than no greater than no greater than no greater than no greater than
standard 4.75~5.50 0.006 0.01 0.35 0.35 0.015 0.015 0.30 0.01
high quality 5.00~5.50 0.006 0.01 0.35 0.35 0.015 0.015 0.30 0.01
High purity 5.00~5.50 0.006 0.005 0.35 0.35 0.015 0.015 0.30 0.005
category
Bi Sn Pb Ag Se Te Tl N O
no greater than no greater than no greater than no greater than no greater than no greater than no greater than no greater than no greater than
standard --- --- 0.0005 --- 0.0003 --- --- --- ---
high quality 0.001 0.005 0.001 0.001 0.0003 --- --- 0.01 0.01
High purity 0.00003 0.005 0.001 0.001 0.0003 0.00005 0.0001 0.01 0.005
Heat treatment system
Alloys have different heat treatment regimes to control grain size, control delta phase morphology, distribution and quantity to obtain different levels of mechanical properties.
Alloy heat treatment system is divided into 3 categories:
: (1010~1065)ºC±10ºC, 1h, oil cooling, air cooling or water cooling +720ºC±5ºC, 8h, furnace cooling at 50ºC/h to 620ºC±5ºC, 8h, air cooling.
The grains of the materials treated by this system are coarsened, and there is no delta phase in the grain boundaries and in the grains, and there is notch sensitivity, but it is beneficial to improve the impact performance and resist low-temperature hydrogen embrittlement.
: (950~980)ºC±10ºC, 1h, oil cooling, air cooling or water cooling +720ºC±5ºC, 8h, furnace cooling at 50ºC/h to 620ºC±5ºC, 8h, air cooling.
: 720°C±5°C, 8h, furnace cooling at 50°C/h to 620°C±5°C, 8h, air cooling.
After this system treatment, the delta phase in the material is less, which can improve the strength and impact performance of the material. This system is also known as the direct aging heat treatment system.
Specifications and Status
Die forgings (disc, plate integral forgings), cakes, rings, rods (forged rods, rolled rods, cold drawn rods), plates, wires, strips, tubes, fasteners of different shapes and sizes, elastic elements, etc. can be supplied. The delivery status is negotiated by both parties. The wire is delivered in reels in the agreed delivery condition.
craft
Alloy smelting process is divided into three categories: vacuum induction electroslag remelting; vacuum induction plus vacuum arc remelting; vacuum induction plus electroslag remelting plus vacuum arc remelting. According to the use requirements of the parts, the required smelting process can be selected to meet the application requirements.
Applications and Requirements
Manufacture of various stationary and rotating parts in aviation and aerospace engines, such as discs, rings, casings, shafts, blades, fasteners, elastic elements, gas conduits, sealing elements, etc. and welded structural parts; manufacturing of nuclear energy industrial applications Various elastic elements and lattices; manufacture of parts and other parts for applications in the petroleum and chemical industries.
In recent years, based on the continuous deepening of research on this alloy and the continuous expansion of its application, many processes have been developed in order to improve quality and reduce costs: the use of helium cooling process during vacuum arc remelting can effectively reduce niobium segregation; The ring parts are produced by the injection molding process to reduce costs and shorten the production cycle; the superplastic forming process is used to expand the production range of the products.
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Physical and chemical properties
Thermal performance
2.1.1 GH4169 melting temperature range 1260~1320ºC
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