Method for preparing nanocrystalline low activation martensitic steels

A martensitic steel and nanocrystalline technology, applied in the field of structural steel materials, can solve the problems that have not yet been seen in nanocrystalline CLAM steel, and achieve the effect of fast method, smooth surface and uniform structure

Inactive Publication Date: 2013-06-05
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there have been no reports on nanocrystalline CLAM steel at home and abroad.

Method used

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  • Method for preparing nanocrystalline low activation martensitic steels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) A 10 g CLAM steel sample was broken and ultrasonically cleaned with acetone and alcohol.

[0017] 2) Put the sample into the quartz tube. The bottom of the quartz tube is a round hole with a diameter of 1.0 mm. Then insert the quartz tube into the induction heating coil. The distance between the quartz tube and the copper roller is 2 mm.

[0018] 3) Vacuum the furnace body to 1.2×10 -4 Pa. Then fill the furnace with argon, and when the vacuum pressure in the furnace reaches -0.05 Pa, fill the argon pressure tank to 0.05 Pa, so that the pressure of the system is 1 atmosphere.

[0019] 4) Set the speed of the copper roller to 28 m / s, heat the sample, and set the melt blowing temperature to 1520 °C. Quickly press the jet button to get a nanocrystalline CLAM steel thin strip, the main phase is α-Fe, the thin strip is 1.2-2.7 mm wide, the thickness is 40 μm, and the grain size is 19.7 nm.

Embodiment 2

[0021] 1) 8 g of CLAM steel samples were broken and ultrasonically cleaned with acetone and alcohol.

[0022] 2) Put the sample into the quartz tube. The bottom of the quartz tube is a round hole with a diameter of 1.0 mm. Then insert the quartz tube into the induction heating coil. The distance between the quartz tube and the copper roller is 2 mm.

[0023] 3) Vacuum the system to 1.2×10 -4 Pa. Then fill the furnace with argon, and when the pressure in the furnace reaches -0.05 Pa, fill the argon pressure tank to 0.05 Pa, so that the pressure of the system is 1 atmosphere.

[0024] 4) Set the speed of the copper roller to 20 m / s, heat the sample, and set the melt blowing temperature to 1520 °C. Quickly press the air injection button to get a thin strip of nanocrystalline CLAM steel, the main phase is α-Fe, the thin strip is 1.1-3.1 mm wide, the thickness is 60 μm, and the grain size is 25.6 nm.

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Abstract

The invention relates to a method for preparing nanocrystalline low activation martensitic steels and belongs to the technical field of structural steels. Vacuum single rod rotary quenching method is used; a hole-type quartz nozzle of diameter of 0.9-1 millimeter is chosen; vacuum of a furnace is 1-1.5 x 10-4 pascal; pressure difference inside the furnace and a gas tank is normal pressure; speed of a copper roller of a single rod rotary machine is adjusted to 20-30 meters per second; main phase for prepared nanocrystalline is alpha-Fe; width of a thin strip is 1.1-3.1 millimeters; thickness of the thin strip is 40-60 micrometers; and grain size is 19-26 nanometers. The method for preparing nanocrystalline low activation martensitic steels and a device thereof have the advantages of being simple and easy to operate, and providing samples of good quality with no impurity phase, thereby providing materials for nano-science and technology.

Description

technical field [0001] The invention belongs to the technical field of structural steel materials and relates to a method for preparing nanocrystalline structural steel. Background technique [0002] As one of the important directions of human future energy strategy development, nuclear energy has received extensive attention and research. The radiation environment in nuclear reactors is extremely harsh, and it is urgent to research and develop suitable structural materials with good radiation resistance. Grain boundaries in materials can act as effective traps for irradiation-induced defects such as interstitial atoms and vacancies (Xian-Ming Bai, et al. Since, 2010, 327: 1631-1633), especially point defects that move at grain boundaries , so that vacancies and interstitial atoms can be effectively recombined, so that the material has good self-healing performance under irradiation conditions, thereby greatly improving the radiation resistance of the material. Nanocrystal...

Claims

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Application Information

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IPC IPC(8): B22D11/06
Inventor 常永勤张静龙毅吴云飞申贝雷万发荣
Owner UNIV OF SCI & TECH BEIJING
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