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Welding method applied to aluminiferous oxide dispersion strengthened ferrite / martensitic steel

A technology of dispersion strengthening, martensitic steel, applied in welding equipment, welding medium, welding equipment, etc., can solve problems affecting welding quality and other problems, and achieve the effect of excellent mechanical properties and excellent welding performance

Active Publication Date: 2018-03-23
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the practical application characteristics of various welding methods and the fact that the structure of the welded joint (grains and dispersed particles) is different from that of the base metal and affects the welding quality, there is no ideal welding method for the welding of oxide dispersion strengthened steel.

Method used

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  • Welding method applied to aluminiferous oxide dispersion strengthened ferrite / martensitic steel
  • Welding method applied to aluminiferous oxide dispersion strengthened ferrite / martensitic steel
  • Welding method applied to aluminiferous oxide dispersion strengthened ferrite / martensitic steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] material selection:

[0027] (1) The composition of the aluminum-containing oxide dispersion strengthened ferrite / martensitic steel to be welded is 8.5%Cr, 1.2%W, 0.2%V, 0.2%Mn, 3.5%Al, 0.5%Zr, 0.35% Y2O3, the purity of the above raw materials is 99.9%, the content of C and N is less than 0.1%, the rest is Fe, the above are all mass percentages; the preparation method is mechanical alloying and hot isostatic pressing;

[0028] (2) The composition of the middle layer foil is 16wt.%Ni, 8.5wt.%Cr, 3wt.%B, 2wt.%Si, 0.08wt.%C, the purity is 99.9%, the rest is Fe; the thickness is 15 μm ;

[0029] The specific welding process is:

[0030] (1) Surface treatment

[0031] The aluminum-containing oxide dispersion-strengthened ferrite / martensitic steel surface to be welded and the intermediate layer foil are respectively polished, and then placed in an acetone solution for ultrasonic cleaning for 5 to 10 minutes, and dried with cold air to obtain the pretreated Aluminium-containing oxide...

Embodiment 2

[0036] material selection:

[0037] (1) The composition of the aluminum-containing oxide dispersion strengthened ferrite / martensitic steel to be welded is 9%Cr, 1.8%W, 0.3%V, 0.2%Mn, 4.5%Al, 0.2%Hf, 0.4% Y2O3, the purity of the above raw materials is 99.9%, the content of C and N is less than 0.1%, the rest is Fe, the above are all mass percentages; the preparation method is mechanical alloying and hot isostatic pressing;

[0038] (2) The middle layer foil, the composition is 12wt.%Ni, 9wt.%Cr, 3wt.%B, 2wt.%Si, 0.06wt.%C, the purity is 99.9%, the rest is Fe, the thickness is 20μm;

[0039] The specific welding process is:

[0040] (1) Surface treatment

[0041] The aluminum-containing oxide dispersion-strengthened ferrite / martensitic steel surface to be welded and the intermediate layer foil are respectively polished, and then placed in an acetone solution for ultrasonic cleaning for 5 to 10 minutes, and dried with cold air to obtain the pretreated Aluminium-containing oxide dispersio...

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PUM

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Abstract

The invention relates to welding methods for the fourth generation nuclear reactor key structural materials, in particular to a welding method applied to aluminiferous oxide dispersion strengthened ferrite / martensitic steel. According to the welding method, iron-based intermediate layer alloy foil sheets with components of (8-18)wt.% Ni, (8-18)wt.% Cr, 3wt.% B, 2wt.% Si and (0.05-0.08) wt.% C are adopted, a transient liquid phase diffusion bonding method is used for welding the aluminiferous oxide dispersion strengthened ferrite / martensitic steel, the welding temperature is 1150-1200 DEG C, the thermal insulation time is 1-2h, the pressure is 5-10MPa, an NiAl phase with high density and a nanometer size is generated at the interface of welded aluminiferous dispersion strengthened ferrite / martensitic steel and intermediate layer alloy foil, and tensile samples of the welded aluminiferous dispersion strengthened ferrite / martensitic steel with a range from the room temperature to700 EDG C all rupture at the welded aluminiferous dispersion strengthened ferrite / martensitic steel part.

Description

Technical field [0001] The invention relates to a welding technology for key structural materials of a fourth-generation nuclear reactor, in particular to a welding method of aluminum-containing oxide dispersion strengthened ferrite / martensitic steel. Background technique [0002] Oxide dispersion strengthened steel has excellent high-temperature mechanical properties and radiation resistance due to the dispersed distribution of oxide nanoparticles inside, making it a very promising candidate material for structural materials in advanced nuclear energy systems. [0003] Oxide dispersion strengthened steel is usually manufactured by mechanical alloying, hot isostatic pressing or hot extrusion and other forming processes. The material is in a state of non-metallurgical equilibrium. Traditional fusion welding will separate the oxide dispersed particles in the alloy matrix from the liquid metal. Aggregate into slag, fundamentally destroy the structure and performance of oxide dispersio...

Claims

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Application Information

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IPC IPC(8): B23K31/02B23K35/30
CPCB23K31/02B23K35/3053B23K35/3066B23K35/3073
Inventor 张广明周张健
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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