Ni-based superalloy
a superalloy and ni-based technology, applied in the field of ni-based superalloy, can solve the problems of not being provided any ni-based alloy sufficiently satisfying these requirements, unable to cope with the request for a specific gravity drop, and unable to meet the requirements of specific gravity drop, etc., to achieve the effect of reducing the amount of solid solution strengthening elements, reducing the precipitation temperature of ′ phase, and preventing cast cracking
Active Publication Date: 2019-08-20
DAIDO STEEL CO LTD
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AI Technical Summary
Benefits of technology
The alloy achieves a low specific gravity of 7.9 g / cm3 or less, maintains high-temperature strength properties, and improves castability by controlling the Ti / Al ratio, making it suitable for high-temperature parts like turbine wheels.
Problems solved by technology
However, since specific gravity increases, it is difficult to cope with the request for a decrease in the specific gravity.
However, there is a problem in that, in the case where the precipitation amount of the γ′ phase is increased, cast cracking is prone to occur during the solidification process at casting and thus productivity becomes worse.
However, there has not been provided any Ni-based alloy sufficiently satisfying these requirements yet.
Method used
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Experimental program
Comparison scheme
Effect test
examples
[0035]The following will explain Examples of the present invention.
[0036]First, each of alloys having chemical compositions shown in Table 1 was melted in a vacuum melting furnace to cast 50 kg of an ingot. Thereafter, a specimen was prepared from the ingot by machining and, by using the specimen, specific gravity, 0.2% proof strength, elongation, and creep strength were evaluated. Moreover, by using each of the alloys having chemical compositions shown in Table 1, a turbine wheel was prepared to evaluate castability.
[0037]
TABLE 1Chemical Composition (% by mass, provided that Ti + Al and Ti / Al are excluded)Ti + AlTi / AlNiCCrMoCoAlTiZrVNbHfBWTa(atom %)(atom ratio)Alloy of Example1bal.0.159.53.115.07.02.30.051.0——0.015—0.516.50.192bal.0.159.53.115.07.02.30.05———0.015—0.516.60.193bal.0.159.53.115.07.02.30.051.0——0.015—0.216.50.194bal.0.159.53.115.07.02.30.051.0——0.015—1.016.60.195bal.0.159.53.115.07.02.00.051.0——0.015—0.516.20.166bal.0.159.53.115.07.03.10.051.0——0.015—0.517.40.257bal.0....
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Abstract
The present invention relates to an Ni-based superalloy having a composition containing, in terms of % by mass, C: from 0.1 to 0.3%, Cr: from 8.0 to 12.0%, Mo: from 1.0 to 5.0%, Co: from 10.0 to 20.0%, Ta: from 0.01 to 1.50%, Ti: from 2.0 to 4.2%, Al: from 5.0 to 8.0%, V: from 0 to 1.5%, B: from 0.005 to 0.030%, and Zr: from 0.05 to 0.15%, with the balance being Ni and unavoidable impurities, and satisfying, in terms of atom %, Ti+Al being from 16.0 to 20.3% and Ti / Al being 0.3 or less.
Description
TECHNICAL FIELD[0001]The present invention relates to an Ni-based superalloy suitable for application as a material of high temperature parts such as a turbine wheel.BACKGROUND ART[0002]For example, a turbine wheel rotating with receiving an exhaust gas from an engine rotates at a high speed (e.g., the rotation number per minute being hundreds of thousands) under a high temperature (e.g., under a high temperature of about 950° C.) and thus, it is required to be excellent in high-temperature strength properties.[0003]Therefore, as a material of the turbine wheel, an Ni-based superalloy excellent in high-temperature strength properties, particularly an Ni-based cast alloy including Inconel 713C and MAR-M246 as a representative has been mainly used.[0004]As strengthening mechanisms for high-temperature strength in the Ni-based superalloy, solid solution strengthening and γ′ phase (gamma prime phase) precipitation strengthening have been used. Since the γ′ phase (a phase of Ni3(Al, Ti, ...
Claims
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IPC IPC(8): C22C19/05
CPCC22C19/057C22C19/056C22C19/05
Inventor YOKOTA, KYOHEISUMI, YOSHINORIKOYANAGI, YOSHIHIKOTAKABAYASHI, HIROYUKI
Owner DAIDO STEEL CO LTD