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    GH5188

    一、GH5188(GH188)概述

     

      GH5188 is a solution-strengthened cobalt-based superalloy. By adding 14% tungsten solution strengthening, the alloy has excellent high-temperature thermal strength. Adding high content of chromium and trace lanthanum, the alloy has good high-temperature oxidation resistance and satisfactory forming and welding properties. It is suitable for manufacturing aeroengine at 980 C. The following requirements are high strength and parts requiring oxidation resistance below 1100 C. It can also be used in space engines and shuttles. It can produce and supply all kinds of deformed products, such as thin plate, medium plate, strip, bar, forging, wire and precision casting.
    1.1 GH5188 (GH188) Material No. GH5188 (GH188).
    1.2 GH5188 (GH188) similar brands Haynes Alloy No. 188 (HA188), UNSR30188 (United States), KCN22W (France).
    Technical Standard for 1.3 GH5188 (GH188) Materials
    GJB 3317-1998 "Specification for Hot Rolled Plates of Superalloys for Aviation"
    The chemical constituents of 1.4 GH5188 (GH188) are shown in Table 1-1.
    Table 1-1%

    C

    Cr

    Ni

    Co

    W

    Fe

    B

    La

    0.050.15

    20.024.0

    20.024.0

    13.016.0

    ≤3.0

    ≤0.015

    0.030.12

    Mn

    Si

    P

    S

    Ag

    Bi

    Pb

    Cu

    不大于

     

    ≤1.25

    0.200.50

    0.020

    0.015

    0.0010

    0.0001

    0.0010

    0.07

        1.5 GH5188 (GH188) heat treatment system hot-rolled plate 1170-1190 C, air-cooled; cold-rolled strip and plate 1165-1230 C, rapid air-cooled; bar and forging 1180 (+10 (?) C, rapid air-cooled.
    1.6 GH5188 (GH188) Varieties, specifications and supply status supply cold-rolled sheets of delta 0.5-4 mm, hot-rolled medium plates of delta 4-14 mm, cold-rolled strips of delta 0.05-0.8 mm, bars, forgings, welding wires and precision castings of various sizes. Plates are supplied after solid solution treatment, pickling, straightening and trimming; strips are supplied in rolls after solid solution treatment, pickling and trimming; sheets are polished or auto-polished after solid solution treatment; forgings are supplied in solid solution state; and precision castings are delivered in as-cast state.
    1.7 GH5188 (GH188) melting and casting process alloys are produced by vacuum induction melting plus ESR or vacuum arc remelting. Precision castings are produced by vacuum induction melting and vacuum remelting of master alloy ingots.
    1.8 GH5188 (GH188) is widely used in manufacturing high temperature components of gas turbine and missile abroad, such as combustion chamber, tail nozzle and heat exchanger in nuclear energy industry. The high temperature components such as combustion chamber flame cylinder and guide vane of aero-engine made of this alloy have passed the long-term test run in China, and have been put into production and application. In the manufacturing process of parts processed from the alloy sheet, carburizing and copper pollution should be prevented in any process (such as heat treatment, welding, etc.), so as not to damage the mechanical properties and corrosion resistance of the alloy.
    II. Physical and Chemical Properties of GH5188 (GH188)
    Thermal properties of 2.1 GH5188 (GH188)
    The melting temperature range of 2.1.1 GH5188 (GH188) is 1300-1360 C [1].
    The thermal conductivity of 2.1.2 GH5188 (GH188) is shown in Table 2-1.
    Table 2-1 [2]

    θ/

    200

    300

    400

    500

    600

    700

    800

    900

    1000

    λ/(W/(m·))

    12.23

    15.32

    18.30

    20.81

    22.90

    25.04

    26.50

    27.88

    29.06

    The specific heat capacity of 2.1.3 GH5188 (GH188) is shown in Table 2-2.
    Table 2-2 [2]

    θ/

    100

    200

    300

    400

    500

    600

    700

    800

    900

    1000

    c/(J/(kg·))

    208

    425

    454

    484

    513

    534

    554

    571

    588

    600

    The linear expansion coefficient of 2.1.4 GH5188 (GH188) is shown in Table 2-3.
    Table 2-3 [2]

    θ/

    20100

    20200

    20300

    20400

    20500

    20600

    20700

    20800

    20900

    201000

    α/10-6-1

    11.8

    12.4

    12.9

    13.4

    13.7

    14.4

    14.8

    15.2

    15.7

    16.2

    The thermal diffusivity of 2.1.5 GH5188 (GH188) is shown in Table 2-4.
    Table 2-4 [2]

    θ/

    200

    300

    400

    500

    600

    700

    800

    900

    1000

    Q/(10-6m2/s)

    3.15

    3.70

    4.15

    4.45

    4.70

    4.95

    5.10

    5.20

    5.30

    2.2 GH5188 (GH188) density p = 9.09g/cm3 [2].
    The resistivity of 2.3 GH5188 (GH188) electrical alloy is shown in Table 2-5.
    Table 2-5 [2]

    θ/

    20

    100

    200

    300

    400

    500

    600

    700

    800

    900

    1000

    ρ/(10-6Ω·m)

    1.051

    1.056

    1.100

    1.133

    1.143

    1.171

    1.192

    1.199

    1.204

    1.213

    1.226

    2.4 GH5188 (GH188) magnetic alloy is nonmagnetic.
    Chemical Properties of 2.5 GH5188 (GH188)
    Antioxidant Activity of 2.5.1 GH5188 (GH188)
    The oxidation rate of 2.5.1.1 GH5188 (GH188) in air for 100 hours is shown in Table 2-6.
    Table 2-6 [2]

    θ/

    900

    1000

    1100

    氧化速率/(g/m2·h)

    0.0210.034

    0.0810.098

    0.1250.128

    2.5.1.2 GH5188 (GH188) GH5188, GH3536 and GH605 alloy knives with hungry wedge-shaped shapes were cooled in the air for not less than 40 minutes after being tested at a specified temperature for 1 hour in the high-temperature still air of the furnace, and the total number of cycles was 100 weeks. Another group of samples were tested for cyclic oxidation in a rotating combustion device with a rotating speed of 1000r/min, and in a rotating combustion device with a rotating speed of 1000r/min. The weight loss of the sample after 100 weeks of alternating test is shown in Fig. 2-1.
    The corrosion resistance of 2.5.2 GH5188 (GH188) is better than that of nickel-based alloy GH3536 in the environment containing sodium sulfate and sodium chloride. Five kinds of alloy sheets, such as GH5188, have gas velocity of 4 m/s, combustion air containing 5 *10-6 and 5 *10-5 sea salt, fuel oil No. 2 containing 0.3%~0.45% sulphur and air-oil ratio of 30:1. During the test, the sample rotates, and samples are cooled by cold air from 900 C to less than 260 C every 1 h, so the test cycle is carried out on the combustion device after 200 hours. The dynamic hot corrosion test results are shown in Fig. 2-2.

     IMG_256

     

    3. Mechanical properties of GH5188 (GH188)
    The performance of GH5188 (GH188) alloy according to the technical standard for different varieties is shown in Table 3-1.
    Table 3-1

    品种

    拉伸性能

    持久性能

    硬度HV

    其他性能

    θ/

    σP0.2/MPa

    σb/MPa

    δ5/%

    θ/

    σ/MPa

    t/h

    δ5/%

    不小于

    不小于

    中板

    20

    380

    860

    45

    815①

    927①

    165

    76

    23

    23

    10

    15

    282

    晶粒度≥4

    薄板

    20

    650

    380

    250

    860

    620

    45

    50

    927

    76

    23

    15

    -

    弯曲、抗氧化、晶粒度

    带材

    δ≤0.51mm

    20

    650

    380

    250

    860

    620

    40

    40

    927

    62

    23

    8

    -

    弯曲180°、抗氧化、晶粒度≥4

    带材

    δ>0.51mm

    20

    650

    380

    250

    860

    620

    45

    50

    927

    76

    23

    15

    -

    棒材

    20

    380

    860

    45

    927

    90

    23

    15

    HBS≤302

    抗氧化

    锻件

    20

    380

    860

    45

    927

    83

    23

    15

    HBS≤293

    抗氧化

    精铸件

    20②

    300

    600

    10

    815

    165

    15

    -

    -

    -

    (1) A temperature is selected for the durability test.
    (2) Tensile test results during trial production can be used for reference.

      

    IMG_257
    4. GH5188 (GH188) Organization Structure
    Phase Transition Temperature of 4.1 GH5188 (GH188)
    The time-temperature-structure transition curve of 4.2 GH5188 (GH188) is shown in Fig. 4-1.
    Microstructure of 4.3 GH5188 (GH188) Alloy
    The solution state of 4.3.1 GH5188 (GH188) is composed of M6C primary carbides, LaxMyphase bound by a small amount of M6C and lanthanum-rich compounds, and a very small amount of M3B2 and TiC phases in addition to austenite matrix. After long-term exposure at high temperature, M6C will decompose and precipitate M23C6. Some furnace numbers may precipitate L phase, which can be dissolved at 1180 C or remelted at 870 - 980 C after long-term exposure.
    4.3.2 GH5188 (GH188) Medium Plate, Thin Plate and Strip Technology
    The technical standard stipulates that the grain size in the supply state should not be less than 4 grades.
    Effect of Solution Temperature (holding time 10 min) on Grain Size Grade of Sheet Metal
    The impact is shown in Table 4-1.
    Table 4-1 [10]

    固溶温度/

    1100

    1120

    1140

    1150

    1160

    晶粒度/

    87(9)

    87

    78

    68

    68(5)

    固溶温度/

    1170

    1180

    1190

    1200

    1220

    晶粒度/

    57

    57(4)

    56(4)

    46(3)

    35(2)

     5. Technological Performance and Requirements of GH5188 (GH188)
    Formability of 5.1 GH5188 (GH188)
    The heating temperature of 5.1.1 GH5188 (GH188) forging is 1180 C, and the final forging temperature is not less than 980 C. After the casting structure is broken, large deformation can be adopted to reduce reheating times and refine grains.
    5.1.2 GH5188 (GH188) sheet has good plasticity after solution treatment. It can be formed by any cold forming process, but its minimum deformation should be more than 12%, so as to avoid the formation of coarse grains (critical deformation structure) after annealing.
    5.1.3 GH5188 (GH188) Process Plasticity
    5.1.3.1 GH5188 (GH188) high temperature torsional plasticity figure is shown in Fig. 5-1; high temperature tensile plasticity figure is shown in Fig. 5-2.

              IMG_258

    The cupping depth of 5.1.3.2 GH5188 (GH188) delta 1.2 mm plate in the supply state is 10.6-12.0 mm [2].
    The 5.2 GH5188 (GH188) welding performance alloy has good welding performance. It can be joined by various welding processes. Argon arc welding has the best welding effect, and the strength and plasticity of the joints decrease less.

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    Company Address: No. C5-330, Phase II, Dongfang Steel City, Xishan District, Wuxi City


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