Nickel-chromium-based superalloy for room temperature and low temperature environment and preparation method thereof

A low-temperature environment, nickel-chromium-based technology, applied in the field of nickel-chromium-based alloy material preparation, can solve the problems of poor material processability and increase the cost of alloy manufacturing, and achieve the effects of good mechanical properties, low price and simple preparation process

Active Publication Date: 2021-12-17
SHENYANG AEROSPACE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the special strengthening mechanism of this alloy, the pressure processing control requirements are very strict, and the machinability of the material is poor.
In addition, the nominal composition of the cobalt content of the alloy is 35.7 at.%, which is the highest content of elements in the alloy, which greatly increases the manufacturing cost of the alloy
Therefore, this alloy is limited to the manufacture of fasteners with harsher environments

Method used

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  • Nickel-chromium-based superalloy for room temperature and low temperature environment and preparation method thereof
  • Nickel-chromium-based superalloy for room temperature and low temperature environment and preparation method thereof
  • Nickel-chromium-based superalloy for room temperature and low temperature environment and preparation method thereof

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preparation example Construction

[0027] The preparation method of the nickel-chromium-based superalloy for room temperature and low temperature environment comprises the following steps:

[0028] (1) according to the composition described in claim 1 and its atomic percentage preparation alloy and melting and casting into ingot;

[0029] (2) Perform homogenization treatment on the ingot, and then perform hot forging to obtain a forging. Preferably, the temperature of the homogenization treatment is 1150-1200° C., and the time is 10-12 hours. The temperature of the hot forging is 1000-1100°C, the deformation of the forging is 50-60%;

[0030] (3) performing solution heat treatment on the forging to obtain an alloy with FCC single phase, preferably, the temperature of the solution heat treatment is 1150-1200°C, and the time is 2-4h;

[0031] (4) Carrying out cold deformation with a deformation amount of 80-90% to the forging after the solution heat treatment, wherein the cold deformation is realized by cold rol...

Embodiment 1

[0034] Formulated into Ni 64 Cr 25 co 5 Al 3 Ti 3 (at.%) alloy, melted and casted into 18Kg ingot by vacuum induction furnace, after that, the ingot was subjected to homogenization treatment at 1200°C / 12h, and then hot forged at about 1000°C to obtain a forging, wherein, The deformation of the forging is about 50%. Next, the forging is subjected to a solution heat treatment at 1200°C / 2h to obtain a single-phase alloy with a face-centered cubic structure (FCC). After that, after the solution heat treatment The forging is subjected to cold deformation (cold rolling or swaging at room temperature) with a deformation amount of 80%, and finally, the forging after cold deformation is subjected to a low-temperature aging heat treatment at 600°C / 24h to obtain the nickel-chromium base for room temperature and low-temperature environment. Superalloy samples (sheet or rod).

[0035] to 10 -3 the s -1 The obtained superalloy sample is stretched at a certain tensile rate. At room te...

Embodiment 2

[0037] Formulated into Ni 62 Cr 25.5 co 5.5 Al 3.5 Ti 3.5(at.%) alloy, melted and casted into 18Kg ingot by vacuum induction furnace, after that, the ingot was subjected to homogenization treatment at 1150°C / 12h, and then hot forged at about 1050°C to obtain a forging, wherein, The deformation of the forging is about 60%. Next, the forging is subjected to a solution heat treatment at 1150°C / 2h to obtain a single-phase alloy with a face-centered cubic structure (FCC). After that, the solid solution heat treatment The forging is subjected to cold deformation (cold rolling or swaging at room temperature) with a deformation amount of 90%. Finally, the forging after cold deformation is subjected to a low-temperature aging heat treatment at 610°C / 26h to obtain the nickel-chromium base for room temperature and low-temperature environment. Superalloy samples (sheet or rod).

[0038] to 10 -3 the s -1 The obtained superalloy sample is stretched at a certain tensile rate. At room...

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Abstract

The invention discloses a nickel-chromium-based superalloy for room temperature and low-temperature environments and a preparation method thereof, wherein the superalloy is a Ni-Cr-Co-Al-Ti quinary alloy. The superalloy has a thermodynamically stable dual phase in the intermediate temperature region. The alloy is prepared by melting and casting, cold deformation and low-temperature aging heat treatment, wherein, under the conditions of cold deformation and low-temperature aging heat treatment, the prepared alloy has double inhomogeneity due to discontinuous precipitation of precipitated phases and incomplete recrystallization Microstructure, at room temperature, the tensile plasticity of the prepared alloy can reach more than 10%, the yield strength can reach 1.7GPa, and the tensile strength can reach 1.75GPa; at the temperature of liquid nitrogen, the tensile plasticity can reach more than 20% , the yield strength can reach 1.85GPa, and the tensile strength can reach more than 2.0GPa.

Description

technical field [0001] The invention belongs to the field of preparation of nickel-chromium-based alloy materials, and particularly provides a corrosion-resistant, high-strength and toughness nickel-chromium-based superalloy for room temperature and low temperature environments and a preparation method thereof. Background technique [0002] Before the mid-1970s, the standard fasteners used in aerospace used H-11 alloy (AMS6408), which is a variant of hot work die steel. 8%), it has a tensile strength greater than 1500MPa, and the highest strength level can reach 1800MPa, which meets the performance requirements of fasteners in aerospace and other fields at that time. However, this series of alloys is essentially an iron-based alloy. In order to achieve a high strength level, the chromium content is controlled below 5.0mass%, so the corrosion resistance of this series of alloys is poor. In order to improve the corrosion resistance of fasteners, it is usually necessary to use...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22C19/05C22C1/02C22F1/10
CPCC22C19/058C22C1/023C22F1/10
Inventor杜兴蒿史传鑫盖业辉金城炎闫霏段国升武保林张利王大鹏东野生栓李万鹏
OwnerSHENYANG AEROSPACE UNIVERSITY