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A kind of high grain boundary strength nickel base alloy and preparation method thereof

A nickel-based alloy and grain boundary technology, applied in the field of metallurgy, can solve the problems of high temperature parts of ultra-supercritical boilers, low grain boundary strength, etc., to improve the service life, reduce the loss of chromium, and facilitate the adjustment of furnace temperature. Effect

Active Publication Date: 2016-03-02
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low grain boundary strength of the existing nickel-based alloys, the performance in all aspects cannot meet the requirements of high-temperature components for ultra-supercritical boilers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0024] Specific examples of the present invention are as follows

[0025] 1) Raw material preparation: According to product composition requirements and total smelting weight of each furnace, equip Inconel617 main material with appropriate weight, a small amount of rare earth mixture (a mixture of Re, Y, Ce, Nd and Dy), B, Ta, W for composition adjustment . The chemical composition (weight percent, %) of novel nickel base alloy is:

[0026] Cr: 23%, Cu: 0.2%, Si: 0.2%, Re: 0.3%, C: 0.02%, Mo: 9.0%, Co: 12%, Al: 1%, Ti: 0.4%, B: 0.018%, Ta: 0.2%, W: 0.2%, Re, Y, Ce, Nd and Dy mixture: 0.6%, the rest is Ni;

[0027] 2) Adding order: put Cr, Mo, Ta, W materials with high melting point into the bottom of the crucible first, then add Inconel617 charge, and cover with slag remover;

[0028] 3) Smelting conditions: equipment: vacuum electric arc furnace, smelting temperature: 1660°C, pouring temperature: 1620°C;

[0029] For the mechanical properties and oxidation weight gain of ...

Embodiment 2）

[0034] Specific examples of the present invention are as follows

[0035] 1) Raw material preparation: According to the product composition requirements and the total smelting weight of each furnace, an appropriate weight of Inconel617 main material is equipped, and a small amount of rare earth, B, Ta, W is used for composition adjustment. The chemical composition (weight percent, %) of novel nickel base alloy is:

[0036] Cr: 23%, Cu: 0.2%, Si: 0.2%, Re: 0.3%, C: 0.02%, Mo: 9.0%, Co: 12%, Al: 1%, Ti: 0.4%, B: 0.018%, Ta: 0.2%, W: 0.2%, Y: 0.4%, and the rest is Ni;

[0037]2) Adding order: put Cr, Mo, Ta, W materials with high melting point into the bottom of the crucible first, then add Inconel617 charge, and cover with slag remover;

[0038] 3) Smelting conditions: equipment: vacuum electric arc furnace, smelting temperature: 1650°C, pouring temperature: 1600°C;

[0039] For the mechanical properties and oxidation weight gain of the above-mentioned products, the high-temp...

Embodiment 3）

[0044] 1) Raw material preparation: According to product composition requirements and total smelting weight of each furnace, an appropriate weight of Inconel617 main material is prepared, and a small amount of rare earth oxides, B, Ta, and W are used for composition adjustment. Make the chemical composition (percentage by weight, %) of product nickel base alloy be:

[0045] Cr: 25%, Cu: 0.2%, Si; 0.2%, Y 2 o 3 : 0.5%, C: 0.02%, Mo: 9.0%, Co: 12%, Al: 1%, Ti: 0.4%, B: 0.018%, Ta: 0.3%, W: 0.2%, Ce 2 o 3 : 0.2%, the rest is Ni;

[0046] 2) Adding order: put Cr, Mo, Ta, W materials with high melting point into the bottom of the crucible first, then add Inconel617 charge, and cover with slag remover;

[0047] 3) Smelting conditions: equipment: vacuum electric arc furnace, smelting temperature: 1660°C, pouring temperature: 1620°C;

[0048] For the mechanical properties and oxidation weight gain of the product obtained above, the high temperature performance at 900°C is as foll...

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Abstract

The invention relates to a nickel-based alloy with high grain-boundary strength and a preparation method thereof. The nickel-based alloy consists of the chemical components in percentage by weight; 20-25 percent of chromium, 0.2-0.7 percent of copper, 0.01-0.2 percent of carbon, 8.0-10.0 percent of molybdenum, 10-15 percent of cobalt, 0.5-1.5 percent of aluminum, 0.2-0.6 percent of titanium, 0.01-0.02 percent of boron, 0.01-0.03 percent of tungsten, 0.01-0.3 percent of tantalum, 0.02-0.06 percent of rare earth and the balance of nickel and other unavoidable trace impurity elements. The preparation method for the nickel-based alloy with high grain-boundary strength comprises the following steps of (1) preparing raw materials: preparing a proper amount of Incone1617 main material and a small amount of Re, B, Ta and W for component adjustment; and (2) feeding the materials for smelting: putting the materials Cr, Mo, Ta and W which have high smelting points to the bottom of a crucible, then adding the Incone1617 furnace material, sequentially adding the rest of the raw materials, covering the materials with a slag removal agent, and smelting the materials in a vacuum smelting furnace. By the adding of B, Ta and the rare earth elements, the nickel-based alloy is low in environment sensitivity and can achieve effects of purifying the grain boundary and effectively improving the grain-boundary bonding strength.

Description

technical field [0001] The invention relates to a metallurgical technology, in particular to a nickel-based alloy with high grain boundary strength and a preparation method thereof. Background technique [0002] Nickel-based alloys refer to a class of alloys that have comprehensive properties such as high strength and certain oxidation and corrosion resistance at high temperatures of 650-1000 °C. Because of its high temperature mechanical properties, excellent oxidation resistance and corrosion resistance, it is widely used in aerospace, oil and gas development, petrochemical, chemical engineering, electric power industry, environmental protection engineering, automobile industry, marine engineering, electronics, etc. Industry, electric heating, heat treatment, welding, etc. [0003] In ultra-supercritical boilers, increasing the boiler steam parameters (temperature and pressure) of thermal power units can effectively improve the thermal efficiency of ultra-supercritical th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05C22C30/02C22C1/02
Inventor 胡静胡佳佳范琪蔡伟
Owner CHANGZHOU UNIV
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