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Ferritic/martensitic oxide dispersion strengthened steel with enhanced creep resistance and method of manufacturing the same

一种抗蠕变性、弥散强化的技术，应用在涡轮机、机械设备等方向，能够解决长期蠕变性能降低等问题，达到高拉伸强度、优异抗蠕变性的效果

Inactive Publication Date: 2015-09-09
KOREA ATOMIC ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the oxide dispersion strengthened steel added with tungsten (W) as a solid solution strengthening element is used for a long time in a high temperature stress atmosphere, a Laves (Laves) phase is formed, such as a brittle (Fe,Cr) 2 W, so the long-term creep performance is significantly reduced

Method used

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  • Ferritic/martensitic oxide dispersion strengthened steel with enhanced creep resistance and method of manufacturing the same
  • Ferritic/martensitic oxide dispersion strengthened steel with enhanced creep resistance and method of manufacturing the same
  • Ferritic/martensitic oxide dispersion strengthened steel with enhanced creep resistance and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 Preparation of Oxide Dispersion Strengthened Steel

[0044] Ferritic / martensitic oxide dispersion strengthened steels having the composition described in Table 1 were prepared.

[0045] [Table 1]

[0046]

[0047] That is, high-purity raw material powders (Fe, C, Cr, W, Mo, Ti, Mn, Zr, Ni, V; particle size 200 mesh or below, purity 99% or above) and Y 2 o 3 The powder (50nm or below, purity 99.9%) was mixed for 48 hours, and the mechanically alloyed powder was prepared by mechanical alloying. -5 A vacuum of torr or below was used for 3 hours for degassing. The can containing the prepared powder was treated by hot isostatic pressing (HIP) at 1150°C and 100 MPa for 3 hours, and the resulting product was reheated at 1150°C for 1 hour at a thickness reduction ratio of 80% or more. The product obtained by rolling treatment to prepare oxide dispersion strengthened steel .

Embodiment 2

[0048] Example 2 Determination of Tensile Properties of Oxide Dispersion Strengthened Steel

[0049] The yield strength, maximum tensile strength and total elongation of the five ferrite / martensitic oxide dispersion strengthened steels prepared in Example 1 were measured at room temperature and 700°C. result in figure 2 shown in . Tensile specimens were taken, placed on a calibrated length section parallel to the hot rolling direction of oxide dispersion strengthened steels and prepared according to ASTM E8. Tensile tests were performed at room temperature and 700°C with a strain rate of 1ⅹ10 -4 the s -1 . Perform more than three tensile tests on each sample at this temperature, and calculate the average value and reflect it on the result.

[0050] Such as figure 2 As shown in , the room temperature yield strength of the conventional oxide dispersion strengthened steel as a control alloy is 916 MPa, and the yield strengths of the new alloys 1, 2, 3 and 4 are 913, 917...

Embodiment 3

[0052] Example 3 Confirmation of Creep Resistance of Oxide Dispersion Strengthened Steel

[0053] The five types of oxide dispersion strengthened steels prepared in Example 1 were subjected to creep tests at 700°C, and the results were in image 3 shown in .

[0054] Such as image 3 As shown, it can be confirmed that the new alloys 1, 2, 3 and 4 of the present invention, compared with the control alloys, show a significant increase in creep rupture time at stresses of 150 and 120 MPa.

[0055] It can be seen from the results that the ferrite / martensitic oxide dispersion strengthened steel of the present invention has excellent high temperature creep resistance and excellent long-term stability compared with the conventional oxide dispersion strengthened steel.

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Abstract

Provided are a ferritic / martensitic oxide dispersion strengthened steel with increased high temperature creep resistance, including 0.02 to 0.2 wt % of carbon (C), 8 to 12 wt % of chromium (Cr), 0.1 to 0.5 wt % of yttria (Y2O3), 0.2 to 2 wt % of molybdenum (Mo), 0.01 to 0.5 wt % of titanium (Ti), 0.01 to 1 wt % of manganese (Mn), 0.01 to 0.3 wt % of vanadium (V), 0 to 0.3 wt % of zirconium (Zr), 0 to 0.5 wt % of nickel (Ni), and the remaining content of iron (Fe), and a method of manufacturing the same. The ferritic / martensitic oxide dispersion strengthened steel may be useful as a material for core structural components of a nuclear power system, ultra supercritical pressure steam generator components of a thermal power plant, or engine components of an airplane due to a high tensile strength at 700° C. and excellent creep resistance.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit from Korean Patent Application No. 2014-0025971 filed on March 5, 2014, the entire disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to a ferritic / martensitic oxide dispersion strengthened steel with strong creep resistance and a manufacturing method thereof, more particularly to iron (Fe)-chromium (Cr)-yttrium oxide (Y 2 o 3 ) Alloy elements of molybdenum (Mo), titanium (Ti) and vanadium (V) are added to the alloy system, and the high temperature strength can be improved due to the microscopic distribution of precipitates, and the martensitic phase can be stabilized by adding manganese (Mn). Creep resistant ferritic / martensitic oxide dispersion strengthened steel, and method of manufacture thereof. Background technique [0004] The iron (Fe)-chromium (Cr) alloy in which 8-12 wt% (weight percent) of chromium is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C33/02
CPCB22F2009/041B22F3/12B22F2003/208C22C38/04B22F3/15B22F3/17B22F3/20B22F2003/185C22C38/50C22C38/44B22F9/04B22F5/009C22C38/46C22C38/22B22F3/18C22C33/0285B22F3/1208B22F5/00B22F5/10C22C38/28B22F5/12B22F2998/10
Inventor 金泰圭卢相熏崔秉权金基伯郑龙焕
Owner KOREA ATOMIC ENERGY RES INST
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