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High-strength high-corrosion-resistant nickel-based high-temperature alloy and solution and aging heat treatment method thereof

A nickel-based superalloy and solution aging technology, applied in the field of nickel-based superalloy, can solve the problems of lack of alloy composition control and performance optimization technology, lack of stable industrial production capacity, etc., and achieve the effect of low material cost

Active Publication Date: 2015-04-22
CENT IRON & STEEL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the research and production of high-strength and high-corrosion-resistant nickel-based superalloys in China is still in the initial stage of development, and there is a great lack of composition control and performance optimization technologies for such alloys, let alone stable industrial production capacity

Method used

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  • High-strength high-corrosion-resistant nickel-based high-temperature alloy and solution and aging heat treatment method thereof
  • High-strength high-corrosion-resistant nickel-based high-temperature alloy and solution and aging heat treatment method thereof
  • High-strength high-corrosion-resistant nickel-based high-temperature alloy and solution and aging heat treatment method thereof

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Embodiment 1

[0040] A novel high-strength and high-corrosion-resistant nickel-based superalloy and a solution aging heat treatment method thereof, comprising the following steps:

[0041] Step 1): 40% Ni, 21% Cr, 3.25% Mo, 2.25% Cu, 0.3% Al, 2.2% Ti, 0.01% C, 0.5% Mn, 0.01% Mg, the balance being Fe, added to the vacuum induction furnace for melting, vacuum induction melting and electroslag remelting to obtain alloy ingots, the composition of which is shown in Table 1 No.1 alloy;

[0042] Step 2): the alloy ingot is homogenized in a heat treatment furnace at 1180°C for 30 hours;

[0043] Step 3): After the homogenization treatment, the alloy ingot is forged at 1170°C and held for 1.5 hours, and then forged into a square billet by graded forging through 3 fires, and the deformation amount per fire is 50%;

[0044] Step 4): After hot forging, the billet is kept at 1120°C for 1.5 hours before rolling, and is hot-rolled to a bar through one heat, and the deformation amount of each pass is 40%,...

Embodiment 2

[0052] Step 1): 44% Ni, 21% Cr, 3.25% Mo, 2.25% Cu, 0.3% Al, 2.3% Ti, 0.01% C, 0.5% Mn, 0.01% Mg, the balance is Fe, added to the vacuum induction furnace for melting, vacuum induction melting and electroslag remelting, to obtain alloy ingots, the composition is shown in No.2 alloy in Table 1;

[0053] Step 2): the alloy ingot is homogenized in a heat treatment furnace at 1170° C. for a holding time of 40 hours;

[0054] Step 3): After the homogenization treatment, the alloy ingot is forged at 1160°C and held for 1.5 hours, and then forged into a square billet by graded forging through 4 fires, and the deformation amount per fire is 40%;

[0055] Step 4): After hot forging, the billet is kept at 1130°C for 1.5 hours before rolling, and is hot-rolled to a bar after one heat, and the deformation amount of each pass is 40%, and the bar is made;

[0056] Step 5): The bar obtained in step 3) is kept at 980°C for 70 minutes in a heat treatment furnace, then water-cooled, and then a...

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Abstract

The invention provides a high-strength high-corrosion-resistant nickel-based high-temperature alloy and a solution and aging heat treatment method thereof, and belongs to the technical field of a nickel-based high-temperature alloy. The alloy comprises the following chemical ingredients in percentage by weight: 40.0-44.0 percent of Ni, 19.5-22.5 percent of Cr, 2.5-3.5 percent of Mo, 1.5-3.0 percent of Cu, 0.10-0.50 percent of Al, 1.9-2.4 percent of Ti, less than or equal to 0.03 percent of C, less than or equal to 0.2 percent of Si, less than or equal to 1.0 percent of Mn, less than or equal to 0.02 percent of S, less than or equal to 0.015 percent of P, 0.001-0.005 percent of Mg, and the balance of Fe and inevitable impurities. The precipitates of a strengthening phase in tissues can be more uniform and fine by means of reasonable solution and subsequent aging treatment, the number of precipitated phases which are not beneficial to toughness and corrosion resistance can be remarkably reduced, and the obdurability and corrosion resistance in high-chlorine-ion marine environments and other severe environments of the alloy can be improved. On the basis of not influencing the structural stability, obdurability and corrosion resistance of the alloy, the content of Fe is increased as much as possible so as to improve the hot workability of the alloy and reduce the cost.

Description

technical field [0001] The invention belongs to the technical field of nickel-based superalloys, and in particular relates to a high-strength and high-corrosion-resistant nickel-based superalloy and a solid solution aging heat treatment method thereof, which are suitable for severe corrosion environments such as naval vessels and deep-sea oil and gas exploitation. Background technique [0002] With the development of high-safety and stable ship equipment in the East China Sea and South my country Sea, there is an urgent need to further improve the overall performance of high-power diesel engines, and the use performance of seawater cooling pump shaft materials serving in harsh seawater corrosion environments is also proposed. New and higher requirements have been imposed, not only requiring excellent mechanical properties (high tensile strength and impact resistance), but also good seawater corrosion resistance to withstand large alternating loads and effectively avoid stress ...

Claims

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Application Information

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IPC IPC(8): C22C30/02C22F1/00
Inventor 石照夏颜晓峰段春华赵明汉韩光炜陈霞
Owner CENT IRON & STEEL RES INST
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