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Low-expansion antioxidative Ni-Fe-Cr-based high temperature alloy and preparation method thereof

A ni-fe-cr, superalloy technology, applied in the field of metal structural materials, can solve the problems of poor oxidation resistance and hot corrosion resistance, low high temperature strength, poor hot formability, etc., to improve hot workability, improve high temperature strength, cost reduction effect

Active Publication Date: 2014-01-08
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a high-temperature strength and oxidation resistance excellent in high temperature and low expansion alloy materials, which have the disadvantages of poor hot formability, low high temperature strength, poor oxidation resistance and hot corrosion resistance, and high price. Low expansion and anti-oxidation Ni-Fe-Cr base superalloy with good performance and cost performance and preparation method thereof

Method used

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  • Low-expansion antioxidative Ni-Fe-Cr-based high temperature alloy and preparation method thereof
  • Low-expansion antioxidative Ni-Fe-Cr-based high temperature alloy and preparation method thereof
  • Low-expansion antioxidative Ni-Fe-Cr-based high temperature alloy and preparation method thereof

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Experimental program
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Embodiment 1-6

[0039] 1. The composition of the alloy

[0040] Table 1 provided the chemical composition of Examples 1-6 of the present invention. As comparative materials, No.7 (existing Fe-based low-expansion alloy In929C), No.8 (existing high-temperature low-expansion Ni-Fe-Cr-based alloy Thermo-Span), No.9 (existing High-temperature and low-expansion Ni-Mo-W-based alloy LTES700R) and No.10 (existing high-temperature and low-expansion Ni-Mo-based alloy USC141).

[0041] Table 1 The chemical composition (weight %) of the embodiment of the present invention and comparative example

[0042]

[0043] 2. Alloy melting and thermal deformation

[0044] Each element of each embodiment in Table 1 was added into a vacuum induction furnace for melting, and cast into a master alloy ingot. 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 deformation o...

Embodiment 7

[0057] Step 1: By weight percentage, 22% Fe, 16% Cr, 1.8% Al, 1.8% Ti, 1.2% Nb, 1.0% Mo, 1.5% W, 0.05% Si, 0.1% Mn, 0.2% of Cu, 0.05% of C, 0.005% of B, 0.01% of Zr, 0.01% of P, 0.1% of Y, and the balance of Ni is added to the vacuum induction furnace for melting and casting into master alloy ingots;

[0058] Step 2: Homogenize the master alloy ingot at 1180°C for 20 hours;

[0059] Step 3: hot deforming the homogenized master alloy ingot at 1130°C;

[0060] Step 4: The hot-deformed alloy is subjected to 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 low thermal expansion and oxidation-resistant superalloy. The coefficient of thermal expansion of the alloy between 20°C and 700°C is 14.9×10 -6 / °C.

Embodiment 8

[0062] Step 1: By weight percentage, 20% Fe, 17% Cr, 2.0% Al, 2.5% Ti, 0.5% Nb, 0.3% Mo, 1.5% W, 0.3% Si, 0.7% Mn, 0.3% of Cu, 0.04% of C, 0.008% of B, 0.005% of Zr, 0.005% of P, 0.2% of Ce, and the balance of Ni is added to the vacuum induction furnace for melting and casting into master alloy ingots;

[0063] Step 2: Homogenize the master alloy ingot at 1150°C for 40 hours;

[0064] Step 3: hot deforming the homogenized master alloy ingot at 1100°C;

[0065] Step 4: The hot-deformed alloy is subjected to solution treatment at 1050° C. for 4 hours, then air-cooled, and then treated at 750° C. for 24 hours, and then air-cooled to obtain a low thermal expansion and oxidation-resistant superalloy. The coefficient of thermal expansion of the alloy between 20°C and 700°C is 14.8×10 -6 / °C.

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Abstract

The invention provides a low-expansion antioxidative Ni-Fe-Cr-based high temperature alloy and a preparation method thereof. The alloy comprises 20 to 25% of Fe, 14 to 18% of Cr, 1.5 to 2.0% of Al, 1.5 to 2.5% of Ti, 0.5 to 2.0% of Nb, 0.3 to 2.0% of Mo, 0.5 to 2.0% of W, no more than 1.0% of Si, no more than 1.0% of Mn, no more than 0.5% of Cu, no more than 0.1% of C, no more than 0.01% of B, no more than 0.05% of Zr, no more than 0.05% of P and no more than 0.20% of a rare earth element, with the balance being Ni. The alloy is of a double-phase structure, wherein a substrate is an austenite (gamma) phase with a disordered face-centered structure, and a gamma' [Ni3(Al,Ti)] phase with an ordered structure is dispersed in the austenite. According to the invention, on the basis that structural stability, corrosion resistance and high temperature strength of the alloy are not influenced, the content of Fe is increased as much as possible to improve hot workability of the alloy and reduce cost. Compared with the prior art, the alloy provided by the invention has the advantages of low material cost, a low thermal expansion coefficient, excellent high temperature strength, hot-working performance and anti-oxidation corrosion and in particular, better cost performance when used under the conditions of high temperature, high pressure and supercritical water vapor.

Description

technical field [0001] The invention belongs to the field of metal structural materials, and in particular relates to a low-expansion and anti-oxidation Ni-Fe-Cr-based superalloy and a preparation method thereof. Background technique [0002] The thermal expansion of metals and alloys is caused by the non-coordinated vibration of the lattice lattice. The volume of ordinary metal materials expands almost linearly with the rise of temperature. Between 20°C and 800°C, in terms of linear expansion coefficient α, ferritic heat-resistant steel is usually about 10 to 14×10 -6 / ℃, Ni-based superalloy is about 12~16×10 -6 / ℃, the Fe-Ni base superalloy is about 14~17×10 -6 / ℃, austenitic steel is about 16~19×10 -6 / °C. However, certain alloys with special composition ratios have abnormally low or constant expansion coefficients, and are called low-expansion alloys. From the earliest commercial low-expansion Fe-Ni alloy (Fe-36%Ni, Invar alloy), Fe-Ni-Co (international alloy design...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C30/02C22C30/00C22F1/10C22F1/00
Inventor 谷月峰范长信鲁金涛赵新宝严靖博尹宏飞
Owner XIAN THERMAL POWER RES INST CO LTD
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