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Ni-base high-temperature-resistant alloy and preparation method thereof

A high temperature resistant alloy and alloy technology, applied in the field of high temperature materials, can solve the problems of high temperature durability and high temperature mechanical properties that cannot fully meet the needs of engines and gas turbines, and achieve good mechanical properties, uniform distribution, and long high temperature durability.

Inactive Publication Date: 2015-05-13
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the high-temperature durable life and high-temperature mechanical properties of Rene’220 alloy cannot fully meet the needs of engines and gas turbines used in aviation, aerospace, military industry, thermal power plants, etc.

Method used

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  • Ni-base high-temperature-resistant alloy and preparation method thereof
  • Ni-base high-temperature-resistant alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Formula 1: C 0.03%, Cr 18.8%, Co 12%, Nb 4.5%, Mo 3.2%, Al 0.5%, Ti 1.0%, Ta 3.0%, B 0.008%, and Ni.

[0019] According to formula 1, the ingredients are put into a vacuum induction furnace for smelting to obtain alloy liquid. The molten alloy is cast at a casting temperature of 1390°C and a mold temperature of 960°C, and cooled to room temperature within about 10 minutes to obtain an alloy ingot.

[0020] The alloy ingots are processed in turn as follows:

[0021] Pre-treatment: Put the alloy ingot in a heat treatment furnace, heat up to 1140°C, keep it warm for 4 hours, homogenize the alloy, take it out and cool it in air; put the alloy ingot in a heat treatment furnace, heat it up to 1090°C, keep it warm for 1 hour, take it out air cooled.

[0022] Intermediate treatment: place the alloy ingot in a heat treatment furnace, heat it up to 950°C, keep it warm for 2 hours, take it out and cool it in air.

[0023] Aging treatment: put the alloy ingot in a heat treatment...

Embodiment 2

[0025] Formulation 2: C 0.03%, Cr 18.8%, Co 12%, Nb 4.8%, Mo 3.2%, Al 0.5%, Ti 1.0%, Ta 3.0%, B 0.010%, and Ni.

[0026] According to formula 2, the ingredients are put into a vacuum induction furnace for smelting to obtain alloy liquid. The molten alloy is cast at a casting temperature of 1390°C and a mold temperature of 960°C, and cooled to room temperature within about 10 minutes to obtain an alloy ingot.

[0027] The alloy ingots are processed in turn as follows:

[0028] Pre-treatment: Put the alloy ingot in a heat treatment furnace, heat up to 1140°C, keep it warm for 4 hours, homogenize the alloy, take it out and cool it in air; put the alloy ingot in a heat treatment furnace, heat it up to 1090°C, keep it warm for 1 hour, take it out air cooled.

[0029] Intermediate treatment: place the alloy ingot in a heat treatment furnace, heat up to 955°C, keep it warm for 2 hours, take it out and cool it in air.

[0030] Aging treatment: put the alloy ingot in a heat treatmen...

Embodiment 3

[0032] Formulation 3: C 0.03%, Cr 18.8%, Co 12%, Nb 4.6%, Mo 3.2%, Al 0.5%, Ti 1.0%, Ta 2.5%, B 0.011%, and Ni.

[0033] According to formula 1, the ingredients are put into a vacuum induction furnace for smelting to obtain alloy liquid. The molten alloy is cast at a casting temperature of 1390°C and a mold temperature of 960°C, and cooled to room temperature within about 10 minutes to obtain an alloy ingot.

[0034] The alloy ingots are processed in turn as follows:

[0035] Pre-treatment: Put the alloy ingot in a heat treatment furnace, heat up to 1140°C, keep it warm for 4 hours, homogenize the alloy, take it out and cool it in air; put the alloy ingot in a heat treatment furnace, heat it up to 1090°C, keep it warm for 1 hour, take it out air cooled.

[0036] Intermediate treatment: place the alloy ingot in a heat treatment furnace, heat up to 950°C, keep it warm for 2 hours, take it out and cool it in air.

[0037] Aging treatment: put the alloy ingot in a heat treatmen...

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Abstract

The invention provides a Ni-base high-temperature-resistant alloy and a preparation method thereof, relating to the field of a high-temperature material. The alloy comprises the following components in percentage by weight: 0.02-0.03 percent of C, 18-19 percent of Cr, 12-13 percent of Co, 4.5-4.8 percent of Nb, 3.2-3.3 percent of Mo, 0.4-0.6 percent of Al, 0.8-1.2 percent of Ti, 2.5-3.0 percent of Ta, 0.008-0.011 percent of B and the balance of Ni. The preparation method of the Ni-base alloy material comprises the following steps of: proportioning, smelting and casting to obtain an alloy ingot; heating the alloy ingot to 1,135-1,145 DEG C, preserving heat and air-cooling; heating to 1,085-1,095 DEG C, preserving heat and air-cooling; heating to 940-960 DEG C, preserving heat and air-cooling; and heating to 820-840 DEG C, preserving heat and air-cooling. A large number of gammas'' in the material organization are uniformly distributed, so that the alloy material has good high-temperature mechanical performance.

Description

technical field [0001] The invention relates to the field of high-temperature materials such as engines and gas turbines used in aviation, aerospace, military industry, thermal power plants, etc., and specifically relates to a Ni-Cr-Co high-temperature-resistant alloy material and a preparation method thereof. Background technique [0002] Rene'220 alloy is a Ni-Cr-Co-based high-temperature resistant alloy developed on the basis of Ni-Cr-Fe-based alloy Inconel718 in the United States. Compared with Inconel718, Co is used in Rene'220 alloy instead of Fe, and Ta content. Due to the removal of Fe in the new alloy, the influence of the harmful phase Laves is reduced. And after replacing Fe with Co, the durable life of the alloy can be greatly improved. The increase of Ta causes the alloy to form a large number of precipitation strengthening phases during aging, which makes up for the strength loss caused by the removal of Fe. The compositional design of the Rene’220 alloy inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22F1/10
Inventor 王玲于永泗姚义俊娄琅洪朱耀宵
Owner NANJING UNIV OF INFORMATION SCI & TECH
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