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High-strength and corrosion-resistant nickel-iron-chromium-based high-temperature alloy and preparation method for same

A high-temperature alloy and nickel-iron-chromium technology, which is applied in the field of high-strength corrosion-resistant nickel-iron-chromium-based superalloy and its preparation, can solve the problems of high price and poor hot formability, and achieves improved high temperature strength, improved hot workability, and improved resistance to corrosion. The effect of flue gas corrosive ability

Active Publication Date: 2013-03-27
XIAN THERMAL POWER RES INST CO LTD
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to address the disadvantages of existing nickel-based superalloy materials such as poor hot formability and high price, and propose a high-strength corrosion-resistant material with reasonable composition design, excellent high-temperature strength and corrosion resistance, good processing performance and cost-effective Nickel-iron-chromium-based superalloy and preparation method thereof

Method used

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  • High-strength and corrosion-resistant nickel-iron-chromium-based high-temperature alloy and preparation method for same
  • High-strength and corrosion-resistant nickel-iron-chromium-based high-temperature alloy and preparation method for same
  • High-strength and corrosion-resistant nickel-iron-chromium-based high-temperature alloy and preparation method for same

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Experimental program
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Embodiment 1-5

[0043] 1. The composition of the alloy

[0044] Table 1 provided the chemical composition of Examples 1, 2, 3, 4, and 5 of the present invention. Test materials No.1-No.5 are Ni-Fe-Cr-based alloys of Examples 1, 2, 3, 4, and 5 of the present invention. As comparative materials, No. 6 (the existing Ni-Fe-based alloy GH2984) and No. 7 (the existing Ni-Co-based alloy Inconel 740) were simultaneously prepared.

[0045] The chemical composition (weight %) of table 1 embodiment of the present invention and comparative example (GH2984, Inconel740)

[0046]

[0047]

[0048] 2. Alloy melting and thermal deformation

[0049] The elements of the alloy are melted in a vacuum induction furnace and cast into a master alloy ingot with a chemical composition that meets the requirements. Homogenize the master alloy ingot at 1150-1200°C for 20-40 hours. The homogenized master alloy ingot is subjected to hot deformation (hot rolling or hot extrusion) at 1000-1150°C, with a maximum def...

Embodiment 6

[0074] Step 1: By weight percentage, 22% Fe, 25% Cr, 1.0% Al, 1.5% Ti, 1.0% Nb, 1.0% Mo, 1.2% W, 0.8% Ta, 0.05% Si, 0.1% of Mn, 0.05% of Cu, 0.03% of C, 0.005% of B, 0.01% of Zr, and the balance of Ni are added to the vacuum induction furnace for melting and casting into master alloy ingots;

[0075] Step 2: Homogenize the master alloy ingot at 1200°C for 20 hours;

[0076] Step 3: hot deforming the homogenized master alloy ingot at 1150°C;

[0077] Step 4: The hot-deformed alloy is subjected to solid solution treatment at 1150° C. for 1 hour, then air-cooled, and then treated at 850° C. for 24 hours, and then air-cooled to obtain a high-strength, corrosion-resistant nickel-iron-chromium-based superalloy.

Embodiment 7

[0079] Step 1: By weight percentage, 26% Fe, 20% Cr, 2.0% Al, 2.5% Ti, 0.8% Nb, 0.5% Mo, 1.5% W, 0.7% Ta, 0.1% Si, 0.7% of Mn, 0.3% of Cu, 0.01% of C, 0.008% of B, 0.005% of Zr, and the balance of Ni are added to the vacuum induction furnace for melting and casting into master alloy ingots;

[0080] Step 2: Homogenize the master alloy ingot at 1150°C for 40 hours;

[0081] Step 3: hot deforming the homogenized master alloy ingot at 1100°C;

[0082] Step 4: The hot-deformed alloy is subjected to solid solution treatment at 950° C. for 4 hours, then air-cooled, and then treated at 650° C. for 16 hours, and then air-cooled to obtain a high-strength, corrosion-resistant nickel-iron-chromium-based superalloy.

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Abstract

The invention belongs to the field of metal structural materials, and particularly discloses a high-strength and corrosion-resistant nickel-iron-chromium-based high-temperature alloy and a preparation method for the same. The alloy material is mainly characterized by having the following ingredient range (wt%): 20-30% of Fe, 19-25% of Cr, 0.5-2.5% of Al, 1.0-2.5% of Ti, not greater than 2% of Nb, not greater than 2% of Mo, not greater than 2% of W, not greater than 1% of Ta, not greater than 0.5% of Si, not greater than 1.0% of Mn, not greater than 0.5% of Cu, not greater than 0.05% of C, not greater than 0.01% of B, not greater than 0.03% of Zr and the balance of Ni. The alloy disclosed by the invention is strong in anti-steam-corrosion and anti-fume-corrosion capacities; an ordered-reinforcing phase with dispersed distribution and gamma' phase (Ni3(Al, Ti)) are formed to enhance the high-temperature strength of the alloy; and the content of Fe is increased to the greatest extent on the basis of no influence on the structural stability, the anti-corrosion capacity and the high-temperature strength of the alloy, so as to improve the heat machinability of the alloy and reduce cost. Compared with the prior art, the alloy is low in material cost, excellent in high-temperature strength, heat machinability and corrosion resistance; and in particular, in the case that the alloy is used in the conditions of high temperature, supercritical steam and corrosive fume, the cost performance of the alloy is superior to the cost performances of the existing alloys. The alloy disclosed by the invention can be machined into tube materials, plate materials, bar materials and wire materials.

Description

technical field [0001] The invention belongs to the field of metal structural materials, and relates to a high-strength, corrosion-resistant nickel-iron-chromium-based superalloy and a preparation method thereof. Background technique [0002] According to the 2020 power development plan formulated by the state, my country's installed power generation capacity will increase from the current 400 million kilowatts to 900 million kilowatts in 2020, of which coal-fired units will reach 580 million kilowatts, accounting for 64.4%. Coal-fired power generation generates high-temperature and high-pressure steam to drive steam turbines to generate electricity. The higher the temperature and pressure of the steam, the higher the efficiency of power generation. At present, the water vapor pressure of coal-fired power generation in the world has reached about 27-32MPa, the steam temperature is 566-600°C, and the thermal efficiency can reach 42-45%, which is called an ultra-supercritical ...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C30/00C22C30/02C22F1/10C22F1/00
Inventor 谷月峰范长信贾建民
Owner XIAN THERMAL POWER RES INST CO LTD
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