Oxide-dispersion-strengthened low-activation steel and preparation method thereof

A low-activation steel and dispersion strengthening technology, applied in the field of radiation-resistant metal materials, can solve the problems of high purity requirements of pure metal powder, difficult control of impurity content, and difficulty in preparing activated steel, so as to improve purity and density, Improving the high temperature mechanical properties and the effect of improving the mechanical properties

Active Publication Date: 2016-01-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Rare earth metals Y and Y 2 o 3 These characteristics of oxide particles make the preparation of oxide dispersion strengthened low activation steel more and more difficult
At present, many research teams in Europe, America, Japan and other countries ...

Method used

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  • Oxide-dispersion-strengthened low-activation steel and preparation method thereof
  • Oxide-dispersion-strengthened low-activation steel and preparation method thereof
  • Oxide-dispersion-strengthened low-activation steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The mechanical alloying method is used to prepare oxide dispersion strengthened low activation steel. The specific process parameters are as follows:

[0048] The chemical composition of the smelting master alloy is: C: 0.093wt.%, Cr: 8.96wt.%, W: 1.51wt.%, V: 0.20wt.%, Ta: 0.14wt.%, Mn: 0.51wt.% , Al 3.5Mpa, overheating degree> At 200°C, the protective atmosphere is 99.99% argon. Add 0.3% of nanometer Y to the master alloy atomized powder 2 O 3 After 50 hours of high-energy ball milling (the mass ratio of ball to material is 10:1, the ball milling medium is Φ6 and Φ10 mixed hard steel balls, and the ball milling atmosphere is 99.99% Ar), the powder is mixed uniformly, and the air is pumped through the powder jacket (10 -1 Pa / 450℃ / 4h) and hot isostatic pressing method sintered and solidified (1200℃ / 150MPa / 4h), and finally after hot rolling (open rolling at 1100℃, rolling 5 passes, the reduction of each pass is 18- 25%) and heat treatment (normalizing 980℃ / 60min / air coolin...

Embodiment 2

[0050] The difference from the preparation method in Example 1 is that 0.48% of nanometer Y is added to the master alloy atomized powder. 2 O 3 After 40 hours of high-energy ball milling (the ball-to-material mass ratio is 10:1, the ball milling medium is Φ6 and Φ10 mixed hard steel balls, the ball milling atmosphere is 99.99% Ar), the powder is mixed uniformly, and the air is pumped through the powder jacket (10 -1 Pa / 500℃ / 4h) and hot isostatic pressing method sintered and solidified (1200℃ / 120MPa / 3.5h), and finally after hot rolling (starting at 1200℃, rolling 6 passes, the reduction of each pass is 18 -25%) and heat treatment (normalizing 980°C / 60min / air cooling + tempering 760°C / 90min / air cooling) to obtain the final oxide dispersion strengthened low activation steel.

Embodiment 3

[0052] The difference from the preparation method of Example 1 is that 0.3% of nanometer Y is added to the atomized powder of the master alloy. 2 O 3 After 70h of high-energy ball milling (ball-to-battery ratio is 10:1, ball milling medium is Φ6 and Φ10 mixed hard steel balls, ball milling atmosphere is 99.99% Ar), the powder is mixed uniformly, and the air is pumped through the powder jacket (10 -1 Pa / 450℃ / 4h) and hot isostatic pressing method sintered and solidified (1100℃ / 140MPa / 3h), and finally undergoes hot rolling (1150℃ open rolling, rolling 5 passes, and the reduction of each pass is 18- 25%) and heat treatment (normalizing 980°C / 60min / air cooling + tempering 760°C / 90min / air cooling) to obtain the final oxide dispersion strengthened low activation steel.

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Abstract

The invention aims at providing oxide-dispersion-strengthened low-activation steel applicable to fusion reactor and a preparation method thereof. The technical scheme is characterized in that the low-activation steel comprises the following alloy elements in percent by mass, Fe as the matrix, 0.08%<=C<=0.15%, 8.0%<=Cr<=10.0%, 1.1%<=W<=1.55%, 0.1%<=V<=0.3%, 0.03%<=Ta<=0.2%, 0.1<=Mn<=0.6%, 0.05%<=Y2O3<=0.5%, and a little amount of impurities inevitably mixed during manufacture. The easily-activated elements and impurity elements all capable of generating radionuclides after being subjected to neutron irradiation are strictly controlled according to the following content requirements: N<0.010%, Al<0.010%, Ni<0.005%, Mo<0.005%, Nb<0.010%, Cu<0.010%, P<0.005%, and S<0.005%. The oxide-dispersion-strengthened low-activation steel is uniform in microstructure and excellent in mechanical properties.

Description

Technical field [0001] The invention belongs to the field of radiation-resistant metal materials, and specifically relates to an oxide dispersion strengthened low-activated steel used for fusion reactors, which can resist strong neutron radiation and has excellent mechanical properties. Background technique [0002] As the world energy crisis intensifies, clean energy will become an important strategic development resource. Among them, the process of nuclear power generation can achieve zero pollution emissions, and the energy density of nuclear fuel is several million times higher than that of fossil fuels. Therefore, nuclear power will bring huge profits to commercial power stations in the future. In the future, the service environment of structural materials for commercial fusion fission reactors will be harsh and harsh, which puts forward higher performance requirements for nuclear reactor structural materials. Low activation ferritic martensitic steel has low activation per...

Claims

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Application Information

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IPC IPC(8): C22C38/48C22C33/02C21D8/00
Inventor 单以银胡雪黄礼新严伟王开阳
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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