Ferritic oxide dispersion strengthened alloy with enhanced room temperature and high temperature strength and manufacturing method thereof

A technology of dispersion strengthening and high-temperature strength, which is applied in the field of ferrite oxide dispersion-strengthening alloys and its manufacturing, can solve the problems of small enhancement of high-temperature strength characteristics and achieve good tensile properties

Inactive Publication Date: 2014-10-01
KOREA ATOMIC ENERGY RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the enhancement effect of the high-temperature strength properties of the oxide dispersion-strengthened alloy produced by the above-mentioned method is small, and there is an urgent need to develop an oxide dispersion-strengthened alloy with better tensile strength.

Method used

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  • Ferritic oxide dispersion strengthened alloy with enhanced room temperature and high temperature strength and manufacturing method thereof
  • Ferritic oxide dispersion strengthened alloy with enhanced room temperature and high temperature strength and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1. Manufacture of Ferritic Oxide Dispersion Strengthened Alloy

[0046] Ferritic oxide dispersion strengthened alloys having the compositions listed in Table 1 below were produced.

[0047] [Table 1]

[0048]

Fe

Cr

W

Mo

Ti

Zr

Y 2 o 3

Reference Alloy 1

Bal.

15

2

0.25

0.35

Reference Alloy 2

Bal.

15.5

1

1.8

0.25

0.35

new alloy 1

Bal.

15.5

1

1.8

0.1

0.2

0.35

New Alloy 2

Bal.

15.5

2

1

0.1

0.2

0.35

New Alloy 3

Bal.

14

0.2

1

0.1

0.25

0.35

[0049] (unit weight%)

[0050] That is, high-purity raw material powder (Fe, W, Cr, Mo, Ti, Zr, particle size below 200 mesh, purity above 99%) and Y 2 o 3 Powders (below 50nm, purity 99.9%) are mixed by weight, and the alloy powder is produced by mechanical alloying method using a horizontal ball mil...

Embodiment 2

[0051] Embodiment 2. Comparison experiment of normal temperature and high temperature strength characteristics

[0052] Measure its YS (yield strength), UTS (ultimate tensile strength) and TE (total elongation) under normal temperature and 700 ℃ conditions for 5 kinds of ferritic oxide dispersion strengthened alloys manufactured in embodiment 1, and The result is shown in the figure 1 middle.

[0053] refer to figure 1 It can be seen that the yield strength of reference alloy 1 without zirconium (Zr) and molybdenum (Mo) is 729 MPa at room temperature and 181 MPa at 700°C. The yield strength of Reference Alloy 2 not containing zirconium (Zr) was 773 MPa at room temperature and 193 MPa at 700°C. In contrast, for the new alloys 1, 2 and 3 of the present invention that add molybdenum (Mo) as a solid solution strengthening element and add trace alloy elements such as titanium (Ti) and zirconium (Zr), at room temperature The yield strength is 798-850MPa, and it is 239-272MPa a...

Embodiment 3

[0055] Embodiment 3. Comparative experiment of high temperature creep characteristics

[0056] Creep (Creep) tests were carried out at 700°C for the five ferritic oxide dispersion-strengthened alloys manufactured in Example 1, and the results are shown in figure 2 middle.

[0057] refer to figure 2 It can be seen that under the stress of 120, 150 MPa, compared with the reference alloy 1 and the reference alloy 2, the creep rupture time of the alloys of the present invention (new alloys 1 to 3) is significantly increased.

[0058] The above results show that the ferritic oxide dispersion strengthened alloy according to the present invention has better high temperature creep properties than the existing ferrite oxide dispersion strengthened alloy.

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Abstract

The invention relates to a ferritic oxide dispersion strengthened alloy with enhanced room temperature and high temperature strength containing Cr in a range of from 12 to 20wt%, Y2O3 in a range of from 0.1 to 0.5wt%, W 0.1 to4wt%, Mo 0.5 to 2 wt%, Ti 0.1 to 0.3 wt%, and Zr 0.02 to 0.3 wt%, and Fe, and a manufacturing method thereof. The ferritic oxide dispersion strengthened alloy is advantageous in that under the 700-degree temperature condition, the anti-tensioning performance is good, the alloy can be used for the supercritical steam generator part (rotor wings, and shafts) used for the thermal power, airplane engine part (circular discs, and effusers), and sodium-cooled fast reactor and other nuclear power system reactor core structural parts such as nuclear coating tube, conduits, conductors, and end plugs).

Description

technical field [0001] The invention relates to a ferrite oxide dispersion strengthened alloy with improved normal temperature and high temperature strength and a manufacturing method thereof. More specifically, it relates to an iron (Fe)-chromium (Cr)-yttrium oxide (Y 2 o 3 ) system alloy as the basic composition, tungsten (W) and molybdenum (Mo) are included as solid solution strengthening elements, and titanium (Ti) and zirconium (Zr) are included as trace alloy elements, and iron that improves the strength at room temperature and high temperature A bulk oxide dispersion-strengthened alloy and a manufacturing method thereof. Background technique [0002] Oxide dispersion strengthened (ODS) alloy is a kind of Y 2 o 3 Alloys such as oxides are uniformly dispersed into the base structure to enhance high temperature strength. Recently, it is used as a material for core structural components (nuclear fuel coating tubes, conduits, wires, etc.) of nuclear power systems such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C33/02
Inventor 卢相熏金泰圭崔秉权韩窗熙姜锡勋金基伯千荣范张真成郑龙焕
Owner KOREA ATOMIC ENERGY RES INST
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