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Wear resistant alloy for high temprature applications

a technology of high temprature and alloy, which is applied in the field of wear-resistant alloy, can solve the problems of mechanical resistance and corrosion resistance, increase the final cost of the valve, and require the use of costly nickel-based superalloys, so as to improve the hot properties of the alloy, increase the chemical affinity, and improve the effect of hot hardness

Inactive Publication Date: 2009-03-26
VILLARES METALS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0011]Another element used by this invention in higher quantities than the state-of-the-art alloys is aluminum, which has a prevailing function of coherent intermetallic containing niobium, Ni3(Al,Nb), thus improving the material's heat resistance. Additionally, aluminum improves the alloy hot oxidation resistance.
[0031]The reduced total titanium percentage in the alloy by the niobium addition in quantities higher than 3.5% improves its hot workability, since the alloy's hot ductility is threatened to values above 4.0% for the sum of titanium and aluminum contents (Ti+Al).

Problems solved by technology

Such extreme stresses in terms of mechanical resistance and corrosion resistance at high temperatures require the use of costly nickel-based superalloys.
Many alloys are coated with Stellite (cobalt base alloy) on the valve's hardfacing, which also increases the final cost of the valve.
One example of an excellent performance alloy in these applications is the NCF 751 alloy, which is very costly because of its high nickel content, above 70%.

Method used

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  • Wear resistant alloy for high temprature applications
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Embodiment Construction

[0045]FIG. 1 shows the microstructure observed in an optical microscope of alloys ET1 and PI1 through PI9, after polishing and attack with Gliceregia reagent for 15 seconds and 120 times magnification.

[0046]FIG. 2 shows the result of the image computer analysis to quantify the carbides observed in the alloys studied with different Ti, Nb and Al contents. Such analysis was performed in a total surface area of 65,990,417 μm2 of the sample, in 50 random fields with 500 times magnification.

[0047]FIG. 3 shows the results of the creep testing of the alloys hereof as compared to ET1 and ET2 alloys, by assessing the creep rupture time for an 800° C. temperature and 3 tensile stress levels. FIG. 4 compares hot resistance of the alloys hereof to ET1 e ET2 alloys, as of the flow stress for several temperatures.

[0048]FIGS. 5 and 6 show the result of the abrasive wear test carried out with ET1, ET2 alloys and PI1 through PI7 alloys. The test was made by pin against sandpaper; the test specimens ...

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Abstract

Low cost alloys resistant to mechanical requirements related to high temperatures, resistant to corrosion, resistant to abrasion, with high workability and which meet different requirements in the conditions for application in either exhaust or intake valves for internal combustion engines. The main features of the alloys is the precipitation of Ni3Nb and niobium carbides in its microstructure. In percentage, its mass consists of: 0.15 to 0.50% C, up to 3.0% Mn, up to 1.0% Si, 12.0 to 25.0% Cr, 25.0 to 49.0% Ni, up to 0.50% Mo, up to 0.50% W, up to 0.50% V, 0.50 to 5.0% Cu, 1.85 to 3.0% Al, 1.0 to 4.5% Ti, 3.1 to 8.0% Nb, 0.001 to 0.02% B, 0.001 to 0.10% Zr, up to 2.0% Co, where (Ni+Co) is not higher than 50.0% in mass, nor lower than 25% in mass. The rest is made of iron and impurities inevitable to the Alloy manufacture procedure.

Description

[0001]This application claims benefit of provisional application 60 / 924,973, filed Jun. 7, 2007.FIELD OF INVENTION[0002]This invention deals with an Ni—Fe—Cr precipitation hardened superalloy for application in internal combustion engine valves, having as chief characteristics the precipitation of Ni3(Al,Ti,Nb) and niobium and titanium carbides in its microstructure. The alloy project, based on its microstructure aspects, allows for the alloy hereof to be provided with properties equal to or higher than those of the alloys used in internal combustion engine valves, associated with the alloy's significant cost reduction because of the lower nickel content.[0003]The alloy hereof is intended for valves' manufacture, where the alloy is required to have several properties, among them the following: oxidation resistance, wear resistance and heat resistance, because of the high temperatures used in the application.BACKGROUND OF THE INVENTION[0004]Conventionally, the materials used for exha...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C30/00
CPCC22C30/00
Inventor BARBOSA, CELSO ANTONIOJARRETA, DAVID DELAGOSTINISOKOLOWSKI, ALEXANDER
Owner VILLARES METALS SA
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