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Preparation method for nickel-based superalloy for exhaust valve

A technology of nickel-based high-temperature alloy and exhaust valve, which is applied in the field of alloys, can solve the problems that materials cannot meet the needs, etc., and achieve the effects of reasonable product composition design, good comprehensive performance, and good high-temperature corrosion resistance

Inactive Publication Date: 2014-08-20
NANTONG WEALTH MASCH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the prior art, one of the purposes of the present invention is to provide a method for preparing a nickel-based superalloy for exhaust valves, so as to solve the problem that the materials in the prior art cannot meet the needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for preparing a nickel-based superalloy for an exhaust valve, the alloy is composed of the following components in terms of weight percentage: C 0.10%, Al 4.5%, W 1.5%, Mo 4.0%, Cr 13.5%, V 0.6% , Zr 0.10%, Nb 1.5%, Fe 8.0%, Ta 3.5%, Cu ≤ 0.20, Mn ≤ 0.8, P ≤ 0.020, S ≤ 0.015, Si ≤ 0.3, the balance Ni and unavoidable impurities; the preparation method shown includes The production process of electric furnace smelting, pouring and heat treatment is described as follows:

[0017] (1) Smelting in an intermediate frequency induction furnace according to the above raw material ratio. The smelting temperature is 1600°C. After melting, samples are taken to analyze the composition, and then the composition is adjusted; the nickel-based alloy melted in the intermediate frequency induction furnace is refined with input gas, and the refining temperature is 1640°C. , the refining time is 0.5 hours, to achieve the purpose of degassing, dephosphorization, desulfurization, and...

Embodiment 2

[0021] A method for preparing a nickel-based superalloy for an exhaust valve, the alloy is composed of the following components in terms of weight percentage: C 0.14%, Al 3.5%, W 2.5%, Mo 2.0%, Cr 15.5%, V 0.4% , Zr 0.20%, Nb 0.5%, Fe 12.0%, Ta 2.5%, Cu≤0.20, Mn≤0.8, P≤0.020, S≤0.015, Si≤0.3, the balance of Ni and unavoidable impurities; the preparation method shown includes The production process of electric furnace smelting, pouring and heat treatment is described as follows:

[0022] (1) Smelting in an intermediate frequency induction furnace according to the above raw material ratio. The smelting temperature is 1600°C. After melting, samples are taken to analyze the composition, and then the composition is adjusted; the nickel-based alloy melted in the intermediate frequency induction furnace is refined with input gas, and the refining temperature is 1620°C. , the refining time is 1 hour, to achieve the purpose of degassing, dephosphorization, desulfurization, and blending...

Embodiment 3

[0026] A method for preparing a nickel-based superalloy for an exhaust valve, the alloy is composed of the following components in weight percentage: C 0.12%, Al 4.0%, W 2.0%, Mo 3.0%, Cr 14.5%, V 0.5% , Zr 0.15%, Nb 1.0%, Fe 10.0%, Ta 3.0%, Cu≤0.20, Mn≤0.8, P≤0.020, S≤0.015, Si≤0.3, the balance of Ni and unavoidable impurities; the preparation method shown includes The production process of electric furnace smelting, pouring and heat treatment is described as follows:

[0027] (1) Smelting in an intermediate frequency induction furnace according to the above raw material ratio, the smelting temperature is 1585°C, after melting, take samples to analyze the composition, and then adjust the composition; the nickel-based alloy melted in the intermediate frequency induction furnace is refined with input gas, and the refining temperature is 1630°C , the refining time is 1 hour, to achieve the purpose of degassing, dephosphorization, desulfurization, and blending various trace alloy...

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Abstract

The invention discloses a preparation method for a nickel-based superalloy for an exhaust valve. The alloy consists of the following components in percentage by weight: 0.10 to 0.14 percent of C, 3.5 to 4.5 percent of Al, 1.5 to 2.5 percent of W, 2.0 to 4.0 percent of Mo, 13.5 to 15.5 percent of Cr, 0.4 to 0.6 percent of V, 0.10 to 0.20 percent of Zr, 0.5 to 1.5 percent of Nb, 8.0 to 12.0 percent of Fe, 2.5 to 3.5 percent of Ta, less than or equal to 0.20 percent of Cu, less than or equal to 0.8 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.3 percent of Si and the balance of Ni and inevitable impurities. The preparation method comprises the following steps of: (1) smelting the raw materials according to the proportions at smelting temperature of 1,570 to 1,600 DEG C in a medium-frequency induction furnace, and refining a product for 0.5 to 1 hour at refining temperature of 1,620 to 1,640 DEG C; (2) regulating pouring temperature into about 1,510 to 1,530 DEG C for pouring; and (3) performing heat treatment, heating the refined product to 1,240 to 1,260 DEG C, preserving heat for 3 to 5 hours, air-cooling the product to room temperature, heating the product to 1,150 to 1,170 DEG C, preserving the heat for 1 to 3 hours, heating the product to 900 to 920 DEG C, and preserving the heat for 18 to 24 hours.

Description

technical field [0001] The invention relates to the field of alloy technology, in particular to a method for preparing a nickel-based superalloy for an exhaust valve. Background technique [0002] Superalloys are alloys based on Group VIIIA metals (iron, cobalt, nickel) with high room temperature and high temperature strength. It has been more than 60 years since the generation and development of superalloys. Driving its development is the demand for heat-resistant alloys for gas turbines in the aerospace industry. The development of superalloys has also led to the progress of alloy chemistry and alloy processing technology. Nickel-based superalloys have higher high-temperature strength. They are developed on the basis of Cr20Ni80 alloys, and are usually strengthened with alloy elements such as Cr, Mo, Co, Ti, Al; the main elements of Cr, Mo, Co, etc. The function is to strengthen the nickel-based solid solution, increase the recrystallization temperature of the matrix, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C1/02C22F1/10
Inventor 杨学焦
Owner NANTONG WEALTH MASCH TECH CO LTD
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