High-chromium nickel-based superalloy, diesel engine gas valve and diesel engine gas valve manufacturing process

A high-chromium nickel-based, manufacturing process technology, applied in the direction of manufacturing tools, metal processing equipment, valve devices, etc., can solve the problem of improving the performance of Ni80A nickel-based superalloy gas valves, narrow range of electric upsetting process parameters, and prone to dynamic hardening and cracks and other problems, to achieve the effect of improving high temperature creep resistance, improving hot processing performance, and small stress change

Pending Publication Date: 2020-08-11
NANJING INT MARINE EQUIP & SPARES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For Ni80A nickel-based superalloy materials, the range of process parameters for electric upsetting is narrow, and it is extremely sensitive to temperature. When the parameters of electric upsetting do not match, dynamic hardening, cracks, etc. will easily occur, and then the wave defects will be deepened (refer to figure 1 As shown in A area), therefore, it is difficult to improve the performance of Ni80A nickel-based superalloy valve simply from the valve manufacturing process

Method used

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  • High-chromium nickel-based superalloy, diesel engine gas valve and diesel engine gas valve manufacturing process
  • High-chromium nickel-based superalloy, diesel engine gas valve and diesel engine gas valve manufacturing process
  • High-chromium nickel-based superalloy, diesel engine gas valve and diesel engine gas valve manufacturing process

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Experimental program
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Effect test

Embodiment 1

[0036] The high-chromium nickel-based superalloy in this embodiment contains the following essential elements in terms of mass percentage: 35% Cr, 1.0% Al, 0.2% Fe, 0.1% Co; the balance is Ni and impurities.

[0037] The high-chromium nickel-based superalloy in this embodiment is subjected to stress-strain tests at different temperatures and strain rates, and the test results are as follows image 3 shown. The stress-strain test result of the Ni80A nickel-based superalloy material in the prior art is as follows figure 2 shown.

[0038] Compared figure 2 and image 3 It can be seen that the high-chromium-nickel-based superalloy in this example is at two identical strain rates ( and ) and five same temperatures (950°C, 1020°C, 1100°C, 1175°C and 1250°C), the stresses are all less than the stress values ​​of Ni80A; in the process of electric upsetting, the deformation resistance is small, the deformation is more uniform, and plastic forming better.

[0039] At the same...

Embodiment 2

[0068] The difference between this embodiment and embodiment 1 lies in the composition of the high-chromium nickel-based superalloy and the number of segments in the high-order segmented dynamic loading mode. The composition of the high-chromium nickel-based superalloy in this embodiment is 45% Cr, 5% Al, 15% Fe, 10% Co; the balance is Ni and impurities. The number of segments in the high-order segment dynamic loading mode is 40 segments.

[0069] The high-chromium nickel-based superalloy in this embodiment is subjected to stress-strain tests at different temperatures and strain rates, and the test results are as follows Figure 7 shown. The stress-strain test result of the Ni80A nickel-based superalloy material in the prior art is as follows figure 2 shown.

[0070] Compared figure 2 and Figure 7 It can be seen that the high-chromium-nickel-based superalloy in this example is at two identical strain rates ( and ) and four same temperatures (950°C, 1100°C, 1150°C a...

Embodiment 3-5

[0082] Table 6 Comparison of formulations of high-chromium nickel-based superalloys

[0083]

[0084] Combination 1: C: 0.08%; Si: 0.33%; B: 0.01%; Cu: 0.36%; Ti: 0.08%; Nb: 0.06%; 0.2%;

[0085] Combination 2: C: 0.08%; Si: 0.42%; B: 0.01%; Cu: 0.34%; Ti: 0.1%; Nb: 0.1%; Ta: 0.04%; V: 0.07%; 0.4%;

[0086] Combination 3: C: 0.1%; Si: 0.36%; B: 0.01%; Cu: 0.33%; Ti: 0.08%; Nb: 0.06%; 0.35%;

[0087] Among them, the addition of optional elements can further improve the properties of the alloy: Ti and Nb elements can form a γ’ precipitation strengthening phase with Ni, and better high-temperature strength can be obtained. At the same time, Nb also has good strong thermal properties. C element is an indispensable element in steel and also a high-strength carbide-forming element. Usually, C in heat-resistant steel precipitates in the form of carbide during aging, which can improve the mechanical properties. Si is a beneficial element for high temperature corrosion resist...

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Abstract

The invention discloses a high-chromium nickel-based superalloy, a diesel engine gas valve and a diesel engine gas valve manufacturing process. The high-chromium nickel-based superalloy comprises thefollowing essential elements: by mass, 35-45% of Cr, 1.0-5% of Al, 0.2-15% of Fe, 0.1-10% of Co, and the balance Ni and impurities, or Ni, impurities and any element. The diesel engine gas valve is made of the high-chromium nickel-based superalloy. The diesel engine gas valve manufacturing process adopts the electric upsetting-forging forming process; in the electric upsetting process, a high-order segmental dynamic loading mode is adopted to apply electric upsetting forming process parameters; the electric upsetting forming process parameters include the electric upsetting current; accordingto the high-order segmental dynamic loading mode, the electric upsetting process is subdivided into 10 segments or more, the corresponding electric upsetting forming process parameters are loaded to each segment of the electric upsetting process, and accordingly, the amplitude of variation of the electric upsetting forming process parameters is reduced. Through the high-chromium nickel-based superalloy, the diesel engine gas valve and the diesel engine gas valve manufacturing process, the hot forming property of the nickel-based superalloy can be improved, the crystal grain uniformity of electric upset parts is promoted, and surface waviness of the electric upset parts is improved. The hardness, high temperature resistance, corrosion resistance and creep resistance of the diesel engine gasvalve are improved.

Description

technical field [0001] The invention belongs to the technical field of metal plastic forming, in particular to a large-size diesel engine valve made of a high-chromium-nickel-based superalloy material and a manufacturing method thereof. Background technique [0002] Ocean transportation is one of the most important modes of transportation in the international commodity exchange, and the cargo transportation volume accounts for more than 80% of the total international cargo transportation volume. In order to reduce operating costs, all kinds of transport ships are becoming larger and larger, which promotes the continuous strengthening and in-depth development of the single-cylinder power and single-machine power of marine diesel-powered low-speed engines. At the same time, the supercharging technology and exhaust gas recirculation technology corresponding to the high-efficiency combustion economy and low-emission ecology required by the main engine of the ship make the combus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C30/02C22C30/00B21K1/20B21J5/02B21J5/08B21J13/02
CPCB21J5/02B21J5/08B21J13/02B21K1/20C22C19/058C22C30/00C22C30/02
Inventor 蒋立鹤黄云峰蒋倩鲍海波权国政张钰清赵江陈舒婷赵大忠王洋王子晗裴艳艳丁天张帜
Owner NANJING INT MARINE EQUIP & SPARES
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