Oxide-dispersion-strengthened alloy

a technology of dispersion and alloy, applied in the field of oxide dispersion strengthened alloy, can solve the problems of not obtaining the effect of improving high temperature oxidation and corrosion resistance, reducing high temperature strength, and negative effect of aluminum addition on ods alloy, etc., to achieve the effect of improving reducing particle diameter and dispersion spacing of oxide, and reducing high temperature oxidation and corrosion resistan

Inactive Publication Date: 2011-06-16
HOKKAIDO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0018]According to the present invention, even with aluminum contained, the particle diameter and dispersion spacing of the oxide are decreased, and the strength at high temperature, the high temperature oxidation and the corrosion resistance can be improved.

Problems solved by technology

Therefore, a problem of the above Patent Literature 1 is that a positive effect of the addition of aluminum on an ODS alloy, that is, the effect of improving high temperature oxidation and corrosion resistance, is not obtained.
On the other hand, a problem is that in the presence of aluminum having low oxide formation energy, aluminum oxide forms a complex oxide with yttrium oxide, decreasing the high temperature strength, as pointed out in Patent Literature 1,
This gamma prime phase has a property that as the temperature increases, the yield strength increases, but a problem of this gamma prime phase is that at a high temperature of 900° C. or more, it dissolves, and therefore, the high temperature strength decreases.
Therefore, a problem of conventional ODS alloys is that the effect of improving high temperature strength by the dispersion of oxide particles is not sufficiently obtained.

Method used

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Examples

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example 1

[0069]Next, as Example 1, one obtained by further adding hafnium to the formulation of Comparative Example 3, that is, a nickel-based ODS alloy containing aluminum, hafnium, and yttrium oxide was manufactured. Specifically, 1 wt % of yttrium oxide, 0.5 wt % of aluminum, and 0.8 wt % of hafnium were contained in a nickel-base alloy.

[0070]The amount of hafnium added was determined so that the ratio of the number of molecules of yttrium oxide to the number of molecules of hafnium oxide was 1:1 in order to effectively form a complex oxide of yttrium oxide (Y2O3) and hafnium oxide (HfO2).

[0071]As shown in FIG. 3 and FIG. 7, in the ODS alloy of this Example 1, the oxide particles had an average particle diameter of 7 nm and an average dispersion spacing of 47 nm. In addition, this ODS alloy had a yield stress of 350 MPa at 1000° C. and a Vickers hardness of 458 HV. Therefore, it was confirmed that by the addition of hafnium, the average particle diameter decreased to half, and the average...

example 2

[0074]In Example 2, the amount of hafnium added was reduced with respect to the formulation of Example 1, and a nickel-based ODS alloy containing aluminum, hafnium, and yttrium oxide was manufactured. Specifically, 1 wt % of yttrium oxide, 0.5 wt % of aluminum, and 0.4 wt % of hafnium were contained in a nickel-base alloy. The amount of hafnium added was determined so that the ratio of the number of molecules of yttrium oxide to the number of molecules of hafnium oxide was 1:0.5.

[0075]As shown in FIG. 3 and FIG. 8, in the ODS alloy of this Example 2, the oxide particles had an average particle diameter of 8 nm and an average dispersion spacing of 51 nm. In addition, this ODS alloy had a yield stress of 340 MPa at 1000° C. and a Vickers hardness of 439 HV. Therefore, also in this Example 2, as in Example 1, it was confirmed that by the addition of hafnium, the average particle diameter decreased to almost half, and the average dispersion spacing was reduced to as small as about ¼, co...

example 3

[0077]In Example 3, the amount of hafnium added was increased with respect to the formulation of Example 1, and a nickel-based ODS alloy containing aluminum, hafnium, and yttrium oxide was manufactured. Specifically, 1 wt % of yttrium oxide, 0.5 wt % of aluminum, and 1.6 wt % of hafnium were contained in a nickel-base alloy. The amount of hafnium added was determined so that the ratio of the number of molecules of yttrium oxide to the number of molecules of hafnium oxide was 1:2.

[0078]As shown in FIG. 3 and FIG. 9, in the ODS alloy of this Example 3, the oxide particles had an average particle diameter of 8 nm and an average dispersion spacing of 55 nm. This ODS alloy had a yield stress of 319 MPa at 1000° C. and a Vickers hardness of 424 HV. Therefore, it was confirmed that in the ODS alloy of this Example 3, by the addition of hafnium, the average particle diameter decreased to almost half, and the average dispersion spacing was minimized to as small as about 30%, compared with Co...

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Abstract

The present invention provides an oxide dispersion strengthened alloy in which even with aluminum contained, the particle diameter and dispersion spacing of the oxide are decreased, and the strength at high temperature, the high temperature oxidation and the corrosion resistance can be improved. An oxide dispersion strengthened alloy being a nickel-base alloy containing aluminum, hafnium, and yttrium oxide, wherein a complex oxide of the yttrium oxide and hafnium oxide is dispersed in a matrix of the nickel-base alloy, with the aluminum contained.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a U.S. national application of PCT International Application PCT / JP2009 / 064410, filed Aug. 17, 2009, which claims priority to Japanese Application No. 2008-212185, filed Aug. 20, 2008, the contents of each of which are incorporated by reference in their entirety for all purposes.FIELD OF THE INVENTION[0002]The present invention relates to an oxide dispersion strengthened alloy and particularly to an oxide dispersion strengthened alloy that is preferred as a material for the rotor blade or stator blade of a gas turbine, a high temperature heating furnace member, or the like used at high temperature.BACKGROUND OF THE INVENTION[0003]Conventionally, the research and development of materials called oxide dispersion strengthened (hereinafter referred to as “ODS”) alloys, as high temperature-resistant materials used for gas turbines and the like, have been performed. For these ODS alloys, an alloy powder and an oxide powder a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C19/03
CPCC22C1/1084C22C32/0089C22C19/03C22C19/007C22C32/001
Inventor UKAI, SHIGEHARUOONUKI, SOUMEIHAYASHI, SHIGENARIHOSHINO, TAKESHI
Owner HOKKAIDO UNIVERSITY
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