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A thermal processing method for industrial-scale low-activation martensitic steel plates for fusion reactors

A martensitic steel, industrial-scale technology, applied in the field of metal material modification and plastic forming, can solve the problems of CLAM steel ingot segregation, uneven structure and performance, and failure to meet the requirements for the use of fusion reactors, and achieve grain refinement , save time and cost, improve the effect of composition uniformity

Active Publication Date: 2017-11-07
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although hundreds of kilograms of CLAM processing technology has certain reference significance for the production of CLAM steel plates on an industrial scale (more than 6 tons), there are serious segregation and inhomogeneity in microstructure and properties in large-scale CLAM steel ingots on an industrial scale , using the previous processing technology, the yield strength of the material is 460MPa, and the impact energy absorbed at room temperature is 130J, which does not meet the requirements of the fusion reactor design.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A low-activation martensitic steel for a fusion reactor, the main components of which are 9% Cr, 1.5% W, 0.20% V, 0.15% Ta, 0.45% Mn, 1.0% C, and the rest is Fe. According to this composition ratio, the charge is smelted in a vacuum induction furnace: (1) the vacuum degree is 0.1-10Pa, filled with argon to 0.005-0.08MPa, and the melting temperature is 1450-1650°C; Fe, then add Cr, W, then add Ta, V, finally add C, Mn, and depending on the oxygen content level in pure iron, add a small amount of C for deoxidation before adding Cr; (3) On-line detection of alloy element composition and according to The test results add alloy elements; (4) After the composition is qualified, it is poured under vacuum, and the pouring temperature is 1450-1550°C. Obtained more than 6 tons of ingots with a diameter of 400mm

[0015] (1) Billet forging process:

[0016] 1) Heating: Diffusion annealing is carried out on the ingot at 1180-1280°C for 25 hours. The furnace temperature does not e...

Embodiment 2

[0025] A low-activation martensitic steel for a fusion reactor, the main components of which are 9% Cr, 1.5% W, 0.20% V, 0.15% Ta, 0.45% Mn, 1.0% C, and the rest is Fe. According to this composition ratio, the charge is smelted in a vacuum induction furnace: (1) the vacuum degree is 0.1-10Pa, filled with argon to 0.005-0.08MPa, and the melting temperature is 1450-1650°C; Fe, then add Cr, W, then add Ta, V, finally add C, Mn, and depending on the oxygen content level in pure iron, add a small amount of C for deoxidation before adding Cr; (3) On-line detection of alloy element composition and according to The test results add alloy elements; (4) After the composition is qualified, it is poured under vacuum, and the pouring temperature is 1450-1550°C. More than 6 tons of ingots with a diameter of 600mm were obtained.

[0026] (1) Billet forging process:

[0027] 1) Heating: Diffusion annealing is carried out on the ingot at 1180-1280°C for 32 hours. The furnace temperature does...

Embodiment 3

[0036]A low-activation martensitic steel for a fusion reactor, the main components of which are 9% Cr, 1.5% W, 0.20% V, 0.15% Ta, 0.45% Mn, 1.0% C, and the rest is Fe. According to this composition ratio, the charge is smelted in a vacuum induction furnace: (1) the vacuum degree is 0.1-10Pa, filled with argon to 0.005-0.08MPa, and the melting temperature is 1450-1650°C; Fe, then add Cr, W, then add Ta, V, finally add C, Mn, and depending on the oxygen content level in pure iron, add a small amount of C for deoxidation before adding Cr; (3) On-line detection of alloy element composition and according to The test results add alloy elements; (4) After the composition is qualified, it is poured under vacuum, and the pouring temperature is 1450-1550°C. Obtained more than 6 tons of ingots with a diameter of 800mm

[0037] (1) Billet forging process:

[0038] 1) Heating: Diffusion annealing is carried out on the ingot at 1180-1280°C for 40 hours. The furnace temperature does not ex...

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Abstract

The invention discloses a thermal processing method for an industrial scale low-activation martensitic steel panel for a fusion reactor. The method comprises the following steps: firstly heating a smelted cast ingot to 1180-1280 DEG C for diffusion annealing, and then cooling the cast ingot to 1150+ / -20 DEG C for forging; after forging, slowly cooling a blank to below 100 DEG C, and then performing tempering treatment at 760+ / -10 DEG C for 6-20 hours; and after insulating the obtained blank at 1050-1160 DEG C for 80-100 minutes, rolling the blank, and after air-cooling, directly performing tempering treatment at 740+ / -20 DEG C for 90-140 minutes. According to the invention, a forging process of industrial scale low-activation martensitic steel is optimized, a solution hardening process of a hot rolled steel panel is canceled by virtue of a method of combining directly air-cooling treatment and high-temperature tempering treatment after hot rolling, the time is shortened and the cost is lowered, and meanwhile, the material has relatively good strength and toughness.

Description

technical field [0001] The invention relates to a material thermal processing method, which belongs to the field of metal material modification and plastic forming. Background technique [0002] The service environment of nuclear fusion reactor cladding is far worse than that of nuclear fission. The structural materials of fusion reactor cladding face high-energy neutron radiation (14MeV), high temperature, and high heat flux (>1MW / m 2 ), complex mechanical loads, and liquid metal corrosion and other complex environments. Low-activation ferritic / martensitic steel (RAFM steel) is generally considered to be a fusion reactor due to its superiority such as high thermal conductivity, low radiation swelling and corrosion resistance to liquid PbLi, as well as a relatively mature industrial base. material of choice for construction. Since 2002, CLAM (China Low Activation Martensitic) steel (ZL 200610085908.2), developed by the Institute of Nuclear Energy Safety Technology, Chin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D7/13
CPCC21D7/13
Inventor 徐刚吴宜灿黄群英王伟刘少军
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI