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High-strength and high-plasticity duplex stainless steel for layered core and preparation method of high-strength and high-plasticity duplex stainless steel

A duplex stainless steel and plasticity technology, applied in the field of metal materials, can solve the problems of unsatisfactory strong plasticity and processability of FeCrAl alloy, limit the development of nuclear technology, etc., and achieve the effect of inhibiting crack initiation, simple process flow, and improving plasticity.

Active Publication Date: 2022-07-29
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the strong plasticity and processability of FeCrAl alloys in nuclear materials cannot meet the requirements of the current development of nuclear cladding materials, which severely limits the development of nuclear technology.

Method used

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  • High-strength and high-plasticity duplex stainless steel for layered core and preparation method of high-strength and high-plasticity duplex stainless steel
  • High-strength and high-plasticity duplex stainless steel for layered core and preparation method of high-strength and high-plasticity duplex stainless steel
  • High-strength and high-plasticity duplex stainless steel for layered core and preparation method of high-strength and high-plasticity duplex stainless steel

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preparation example Construction

[0036] A preparation method of duplex stainless steel for high-strength plastic layered core, comprising the following steps:

[0037] Step 1. Heating the as-cast FeNiCrAlNb alloy to between 1000°C and 1100°C and then keeping the temperature for 3h-5h, α phase and highly stable γ phase are formed inside the alloy;

[0038] In step 2, the alloy obtained in step 1 is heated to 1000° C.-1100° C. and then hot forged, and then air-cooled to room temperature to obtain a layered structure alloy.

[0039] The reduction amount of hot forging in this step is 50%. The microstructure of the layered structure alloy obtained in this step is shown in Figure 1. The micron-scale layered α, γ primary phases and the sub-micron-scale spherical Laves phases are uniformly distributed. The strength-plasticity curve of the alloy treated by the process of the present invention is as follows: figure 2 As shown, it shows a good strength / plasticity combination, with a tensile strength of 800 MPa and a u...

Embodiment 1

[0056] A preparation method of duplex stainless steel for high-strength plastic layered core, comprising the following steps:

[0057] Step 1. Heat the as-cast FeNiCrAlNb alloy to 1000°C and keep it for 3h;

[0058] In step 2, the alloy obtained in step 1 is heated to 1000°C-1100°C and then hot forged with a reduction amount of 50%, and then air-cooled to room temperature to obtain a layered structure alloy.

[0059] Step 3. The layered structure alloy obtained in step 2 is heated to 700° C. and kept for 1 hour.

[0060] Step 4, cold-rolling the layered structure alloy obtained in step 3, with a reduction amount of 50%, to obtain a strip-shaped alloy with a further refined layered structure.

[0061] Step 5. The alloy obtained in step 4 is heated to 1100° C. for 10 minutes, and then water-cooled to room temperature to obtain a solid solution layered structure duplex stainless steel.

[0062] Step 6: Cold rolling is performed on the alloy obtained in Step 5, and the cold roll...

Embodiment 2

[0065] A preparation method of duplex stainless steel for high-strength plastic layered core, comprising the following steps:

[0066] Step 1. Heat the as-cast FeNiCrAlNb alloy to between 1050°C and keep it for 4h;

[0067] In step 2, the alloy obtained in step 1 is heated to 1000°C-1100°C and then hot forged with a reduction of 50%, and then air-cooled to room temperature to obtain a layered structure alloy.

[0068] Step 3. The layered structure alloy obtained in step 2 is heated to 800° C. and kept for 1 hour.

[0069] Step 4, cold-rolling the layered structure alloy obtained in step 3, with a reduction amount of 50%, to obtain a strip-shaped alloy with a further refined layered structure.

[0070] Step 5. The alloy obtained in step 4 is heated to 1150° C. for 10 minutes, and then water-cooled to room temperature to obtain a solid solution layered structure duplex stainless steel.

[0071] Step 6: Cold rolling is performed on the alloy obtained in Step 5, and the cold rol...

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Abstract

The preparation method comprises the following steps: heating the layered stainless steel in a two-phase region to 750-850 DEG C, carrying out short-time heat preservation for 1 hour, and carrying out air cooling to room temperature, so as to obtain an alpha phase and a gamma phase with very high stability; compared with a traditional method, the strength of the dual-phase steel prepared through the method is improved by 30% to about 920 MPa, and meanwhile the plasticity of the dual-phase steel prepared through the method is improved by 40% or above compared with the plasticity of the dual-phase steel prepared through the traditional method. And then, the alloy is subjected to cold rolling by 50%, solution treatment at the temperature of 1150 DEG C is conducted after rolling deformation, rapid cooling is conducted with water, the temperature of cooling water is the room temperature, and then rolling aging is conducted. The strength of the dual-phase steel prepared through the method is improved by about 150% compared with that of a solid solution state.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a duplex stainless steel for high-strength plastic layered core and a preparation method thereof. Background technique [0002] There are more than 400 operating nuclear reactors around the world, providing about 13% of the world's electricity. Nuclear power has proven to be a reliable, environmentally sustainable and cost-effective source of large-scale electricity. Under these conditions, the decrease in the thermal conductivity of the fuel rapidly pushes the fuel temperature up, causing the Zr alloy cladding to burst at temperatures ranging from 700°C to 1100°C. The world is looking to further improve the reliability, economy and safety of light water reactors under normal and transient operating conditions. Currently, Zinkle S.J.et.al in Journal of Nuclear Materials, 2014, 448(1):374-9. proposes three general strategies for exploring accident-resistant fuels: one is to optimize...

Claims

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Application Information

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IPC IPC(8): C21D8/00C21D1/18C21D1/28C22C33/04
CPCC21D8/005C21D1/28C21D1/18C22C33/04Y02E30/30
Inventor 张金钰高少华刘帅洋刘刚孙军
Owner XI AN JIAOTONG UNIV
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