Method for preparing nanostructured oxide dispersion strengthened steel workpiece by 3D printing technology

A nanostructure, 3D printing technology, applied in the direction of additive processing, etc., can solve the problems of complex process and low efficiency, and achieve the effect of solving complex process, reducing residual stress, improving micro-segregation and porosity

Active Publication Date: 2019-01-18
NORTHEASTERN UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem of complex process and low efficiency of the existing conventional preparation methods of nanostructured ODS steel, the present invention provides a...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Fabrication of nanostructured ODS martensitic steel thin-walled tubes The alloy composition is (mass percentage wt%, the same below) Fe-9Cr-1W-0.5Zr-0.3Ti-0.3Y-0.1Al-0.2Ta. The mixed metal powder is configured according to the alloy constituent elements as the base material.

[0035] The laser power of 3D printing is 1.6kW, the spot diameter is 500μm, and the scanning speed is 380mm / min; the Ar gas flow rate for powder feeding is 1.3 liters / min, the protective Ar gas flow rate is 1.5 liters / min, and the thickness of a single layer of laser cladding is ~220μm. 3D printing was stopped when the workpiece length reached 50cm. According to the test data of nanostructured ODS martensitic steel prepared by experimental research and conventional process, the T of the corresponding composition 0 =850°C, so the heat treatment temperature T=900°C used in this embodiment, the holding time is 55min, and water cooling after the heat treatment is completed. The cut sample is teste...

Embodiment 2

[0037] Fabrication of nanostructured ODS martensitic steel thick-walled tubes The alloy composition is Fe-8Cr-2W-0.9Ti-0.2Zr-0.4Y-0.1Al-0.2Ta-0.1V-0.1Mn-0.1C. Atomized alloy powder (average particle size 121 μm) was prepared according to the alloy composition as the substrate for 3D printing.

[0038] The laser power of 3D printing is 2.5kW, the spot diameter is 580μm, the scanning speed is 150mm / min, the powder feeding gas flow rate is 1.0L / min, the protective Ar gas flow rate is 1.5L / min, and the laser single layer cladding thickness is 260μm. 3D printing was stopped when the workpiece length reached 50cm. According to the test data of nanostructured ODS martensitic steel prepared by experimental research and conventional process, the T of the corresponding composition 0 =860 DEG C, so the heat treatment temperature T=910 DEG C adopted in this embodiment, holding time 55min, water cooling after heat treatment is completed. The cut sample is tested by electron microscope,...

Embodiment 3

[0040] Fabrication of Nanostructured ODS Martensitic / Ferritic Dual-Phase Steel Medium and Thick-walled Tubes The alloy composition is Fe-12Cr-2W-0.3Ti-0.3Zr-0.8Y-4Al-0.3V-0.1Ta-0.4Mn-0.1N. The metal powder is configured according to the alloy constituent elements and mixed into the base material.

[0041] The laser power of 3D printing is 2.5kW, the spot diameter is 550μm, the scanning speed is 300mm / min, the flow rate of powder feeding gas is 1.5 liters / min; the flow rate of shielding gas is 2.0 liters / min, and the single layer thickness of laser cladding is 260μm. Stop printing when the workpiece length reaches 50cm. According to the test data of nanostructured ODS martensitic steel prepared by experimental research and conventional process, the T of the corresponding composition 0 =910°C, so the heat treatment temperature T=960°C used in this embodiment, holding time 49min, air cooling after heat treatment is completed. The cut sample is tested by electron microscope, w...

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Abstract

The invention provides a method for preparing a nano-structure oxide dispersion strengthened (ODS) steel workpiece by a 3D printing technology. The method comprises the following steps of adding Zr in base materials; combining low-temperature protective gas with appropriate technology parameters; and performing simple subsequent heat treatment by the 3D printing technology so as to prepare the nano-structure ODS steel workpiece in characteristic microstructure of nano-structure ODS steel, wherein the nano-structure ODS steel comprises nano-structure ODS martensite steel, nano-structure ODS ferrite/martensite dual-phase steel and nano-structure ODS ferrite steel. The method effectively overcomes the defects that a conventional preparation method is complex in technology, low in efficiency, large in purity fluctuation of a product, low in utilization rate of materials and the like. According to the method, complex subsequent thermal-mechanical treatment is omitted, so that a new technical way is provided for the implementation of using the nano-structure ODS steel as nuclear fuel cladding materials. The prepared nano-structure ODS steel has the advantages that super-high-density Y-M-O type precipitated phases in several nanoscales are obtained, and are in high-dispersed distribution; and mechanical properties, particularly high-temperature strength, toughness and plasticity, are improved.

Description

technical field [0001] The invention relates to the preparation technology of high-temperature-resistant, high-strength, and radiation-resistant alloys for nuclear fuel cladding, the core component of nuclear reactors, and particularly provides a high-performance nanostructured oxide dispersion strengthened steel (nanostructured ODS steel) workpiece prepared by 3D printing technology Methods. Background technique [0002] The nuclear fuel cladding is one of the key structural components of the reactor. Its function is to prevent radioactive fissile substances from entering the primary cooling system, high temperature, constantly changing huge stress, strong chemical reaction, long-term neutron irradiation and high He content. The environment causes a series of microstructural and microchemical changes of cladding materials and significant deterioration of physical, chemical and mechanical properties, so extremely high requirements are placed on cladding materials. As one of...

Claims

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Application Information

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IPC IPC(8): C22C33/02B33Y10/00
CPCC22C33/0235
Inventor 吕铮石英男徐海健卢晨阳谢锐刘春明
Owner NORTHEASTERN UNIV
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