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FeCrAl-based alloy with double heterostructures and preparation method for FeCrAl-based alloy

A technology of heterostructure and base alloy, applied in the field of metal materials, to achieve the effect of preventing coarsening, good plasticity and increasing strength

Active Publication Date: 2021-12-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, heterostructures and multiple heterostructures have not been applied in FeCrAl-based alloys. Therefore, there is still great potential for improving the strong plasticity of FeCrAl-based alloys.

Method used

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  • FeCrAl-based alloy with double heterostructures and preparation method for FeCrAl-based alloy
  • FeCrAl-based alloy with double heterostructures and preparation method for FeCrAl-based alloy
  • FeCrAl-based alloy with double heterostructures and preparation method for FeCrAl-based alloy

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preparation example Construction

[0041] A method for preparing a FeCrAl-based alloy with a double heterostructure, comprising the following steps:

[0042] Step 1. Solid solution treatment of FeCrAl-based alloy at 950° C.-1100° C., and then cooling to room temperature.

[0043] The FeCrAl-based alloy, by mass percentage, includes 12-15% of chromium, 4-5% of aluminum, 1-4% of molybdenum, 0.5-3% of niobium, 0.1-2% of silicon, and inevitable impurity content ≤0.2%, the balance is iron.

[0044] The solid solution time is 5min-240min, and the cooling method is water cooling, oil cooling or air cooling.

[0045] Step 2, performing rolling deformation on the alloy obtained in step 1 with a reduction of 30%-80%.

[0046] The rolling process is as follows: the single-pass reduction during rolling deformation is 5% to 15%, and the rolling temperature is from room temperature to 600°C.

[0047] Step 3, heating the alloy obtained in step 2 to 500°C-800°C for aging treatment, and then cooling to room temperature.

[...

Embodiment 1

[0053] A preparation method of a FeCrAl-based alloy with a double heterogeneous structure is carried out in the following steps:

[0054] Step 1. First select the alloy composition as chromium: 13.5%, aluminum: 4%, molybdenum: 2%, niobium: 1%, silicon: 0.2%, and the balance (by mass percentage) is FeCrAl-based iron and industrial standard impurities. Alloy forgings, and the alloy was solid solution treated at 1050°C for 60min, and cooled to room temperature with water.

[0055] Step 2. Cold-rolling and deforming the alloy obtained in step 1 at room temperature, with a rolling reduction of 10% in a single pass and a total reduction of 80%.

[0056] Step 3. Heat the alloy obtained in step 2 to 600° C. for aging treatment for 60 minutes, and then air-cool to room temperature.

[0057] The layered ferrite grains in the alloy structure obtained in this example are as follows: figure 1 As shown, grain width ~ 16μm; equiaxed ferrite grains such as figure 2 As shown, the grain siz...

Embodiment 2

[0059] A preparation method of a FeCrAl-based alloy with a double heterogeneous structure is carried out in the following steps:

[0060] Step 1. First select the alloy composition as chromium: 12%, aluminum: 4%, molybdenum: 1%, niobium: 0.5%, silicon: 0.2%, and the balance (by mass percentage) is iron and FeCrAl-based impurities that meet industrial standards Alloy forgings, and the alloy was solid solution treated at 1100 ° C for 60 min, and water cooled to room temperature.

[0061] Step 2. Cold-rolling and deforming the alloy obtained in step 1 at room temperature, with a rolling reduction of 10% in a single pass and a total reduction of 80%.

[0062] Step 3. Heat the alloy obtained in step 2 to 800° C. for aging treatment for 60 minutes, and then air-cool to room temperature.

[0063] In this embodiment, when the solid solution temperature is increased to 1100°C, there is still a certain amount of micron-sized Laves second phase remaining, such as Figure 6 As shown, th...

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Abstract

The invention provides FeCrAl-based alloy with double heterostructures and a preparation method for the FeCrAl-based alloy. The alloy comprises the following components in percentage by mass: 12-15 percent of chromium, 4-5 percent of aluminum, 1-4 percent of molybdenum, 0.5-3 percent of niobium, 0.1-2 percent of silicon, less than or equal to 0.2 percent of impurities and the balance of iron. A preparation route of the FeCrAl-based alloy comprises the following steps of: (1) conducting low-temperature incomplete solution treatment on the FeCrAl-based alloy in a forging state so as to retain a certain amount of deformable micron second phase; (2) conducting rolling deformation, and forming high-density dislocation in the alloy; and (3) conducting aging treatment on the alloy at a lower temperature, providing nucleation sites for Laves second phase precipitation through high-density dislocation formed through rolling, and obtaining a high-density nanometer second phase with an extremely low matrix interface mismatch degree in cooperation with a proper component design. For the FeCrAl-based alloy and the preparation method, the heterogeneous Laves second phase plays a role in inhibiting recrystallization of a rolled ferrite matrix, so that heterostructures of lamellar crystal grains and equiaxed crystal grains are obtained. For the FeCrAl-based alloy prepared with the preparation method of the invention, the yield strength is guaranteed to be larger than or equal to 1011MPa, the tensile strength is guaranteed to be larger than or equal to 1197MPa, and the ductility is still larger than or equal to 12.8 percent.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a FeCrAl-based alloy with a double heterogeneous structure and a preparation method thereof. Background technique [0002] Zirconium alloy is currently the only cladding material used in commercial reactor nuclear fuel elements. However, the Fukushima nuclear accident in Japan exposed the fatal flaw of zirconium alloy, that is, zirconium alloy will react with high-temperature cooling water to release a large amount of heat and hydrogen, causing an explosion. Therefore, a lot of work has been carried out at home and abroad around the development of next-generation nuclear cladding materials with excellent high-temperature oxidation resistance and high-temperature strength, that is, accident-resistant cladding materials. [0003] Among many candidate materials, FeCrAl alloy can quickly form dense Al on the surface of the sample because of its Al element. 2 o 3 The oxide film prevents...

Claims

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Application Information

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IPC IPC(8): C21D1/78C21D6/00C21D8/00C22C38/02C22C38/06C22C38/22C22C38/26C22C38/34
CPCC21D1/78C21D6/002C21D6/008C21D8/005C22C38/06C22C38/02C22C38/34C22C38/22C22C38/26C21D2211/005Y02E30/30
Inventor 张金钰刘帅洋张航刘刚孙军
Owner XI AN JIAOTONG UNIV
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