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Low-rhenium high-strength thermal-corrosion-resistant nickel-based single-crystal high-temperature alloy and manufacturing method thereof

A nickel-based single crystal, superalloy technology, applied in nickel-based single crystal superalloy and its manufacture, hot-end components under high pressure, high load and high corrosion conditions, high temperature blades of heavy gas turbines, prepared in high temperature fields , can solve the problems of increased alloy cost, increased density, and easy precipitation of TCP, and achieve good high-temperature durability, strong hot-corrosion resistance, and improved mechanical properties

Inactive Publication Date: 2019-02-22
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Re element is a rare element, and increasing the Re element content will lead to increased alloy cost, increased density, and easy precipitation of defects such as TCP. Therefore, it is very important to develop a nickel-based single crystal superalloy with low rhenium and thermal corrosion resistance. necessary and urgent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The chemical composition weight percent of the designed alloy is: Cr: 9.8%, Co: 9.6%, Mo: 0.7%, W: 5.4%, Al: 4.5%, Ti: 2.93%, Ta: 5.5%, Hf: 0.15%, Re : 1.4%, the balance being Ni.

[0034] Master alloy smelting: using high-purity metal components in a vacuum less than 1×10 -3 The alloy is smelted under the condition of Pa.

[0035] Preparation of nickel-based single crystal alloys: reducing the vacuum of the directional solidification furnace to 1×10 -3 Pa, the alloy is heated by electromagnetic induction, and the melting temperature of the alloy is kept at 1550°C for 15 minutes, poured into the prepared single crystal test rod mold, and pulled at a rate of 6mm / min to prepare a single crystal test rod.

[0036] Heat treatment of the single crystal test rod: solid solution temperature control: sequential heating to 1255°C for 2 hours, continued heating to 1265°C for 4 hours, and then heating to 1270°C for 2 hours;

[0037] Cool down to 1120°C for 4 hours for stabiliza...

Embodiment 2

[0040]The chemical composition weight percent of the designed alloy is: Cr: 9.6%, Co: 10.0%, Mo: 0.6%, W: 5.8%, Al: 4.5%, Ti: 3.15%, Ta: 5.5%, Hf: 0.14%, Re : 1.5%, the balance being Ni.

[0041] a. Master alloy smelting: use high-purity metal components in a vacuum less than 1×10 -3 The alloy is smelted under the condition of Pa.

[0042] b. Preparation of nickel-based single crystal alloy: reduce the vacuum of the directional solidification furnace to 1×10 -3 Pa, the alloy is heated by electromagnetic induction, the melting temperature of the alloy is kept at 1550°C for 25 minutes, poured into the prepared single crystal test rod mold, and pulled at a rate of 15mm / min to prepare a single crystal test rod.

[0043] c. Heat treatment of the single crystal test rod:

[0044] Solid solution temperature control: sequential heating to 1255°C for 2 hours, continued heating to 1265°C for 4 hours, and then heating to 1270°C for 2 hours.

[0045] Cool down to 1120°C for 4 hours fo...

Embodiment 3

[0048] The chemical composition weight percentage of the designed alloy is: Cr: 10.5%, Co: 9.5%, Mo: 1.0%, W: 5.62%, Al: 4.4%, Ti: 2.75%, Ta: 5.7%, Hf: 0.3%, Re : 1.7%, the balance being Ni.

[0049] a. Master alloy smelting: use high-purity metal components in a vacuum less than 1×10 -3 The alloy is smelted under the condition of Pa.

[0050] b. Preparation of nickel-based single crystal alloy: reduce the vacuum of the directional solidification furnace to 1×10 -3 Pa, the alloy is heated by electromagnetic induction, and the melting temperature of the alloy is kept at 1550°C for 30 minutes, poured into the prepared single crystal test rod mold, and pulled at a rate of 20mm / min to prepare a single crystal test rod.

[0051] c. Heat treatment of the single crystal test rod: solid solution temperature control: sequentially heating to 1255°C for 2 hours, continuing heating to 1265°C for 4 hours, then heating to 1270°C for 2 hours; cooling to 1120°C for 4 hours for stabilization...

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Abstract

The invention discloses a low-rhenium high-strength thermal-corrosion-resistant nickel-based single-crystal high-temperature alloy and a manufacturing method thereof. The alloy comprises the followingchemical components of, in percentage by weight, 9.0-12.0% of Cr, 8.0-11.0% of Co, 0.2-1.5% of Mo, 4.5-7.0% of W, 3.5-5.5% of Al, 2.0-4.0% of Ti, 4.5%-6.5% of Ta, 0.1-0.3% of Hf, 1.2-2.0% of Re, andthe balance Ni. The high-temperature endurance performance is superior to that of the PWA1483 alloy, the Re element is low, and good thermal corrosion resistance is achieved; compared with the existing nickel-based single-crystal high-temperature alloy, the content of the Cr element in the alloy component is relatively high, the alloy component has relatively high thermal corrosion resistance; thealloy has good high-temperature endurance performance, the high-temperature performance is superior to that of PWA1483, and the creep time of the 982 DEG C / 100 Mpa is larger than or equal to 5000h.

Description

technical field [0001] The invention belongs to the technical field of manufacturing nickel-based single-crystal superalloys, and specifically relates to a low-rhenium, high-strength, high-strength, thermal-corrosion-resistant nickel-based single-crystal superalloy and a manufacturing method thereof. Hot-end parts under high corrosion conditions, such as high-temperature blades of heavy-duty gas turbines. Background technique [0002] At present, with the development of industry, there is a huge market space for marine power gas turbines, ground industrial gas turbines, and aero-engines suitable for marine conditions. However, these environments are highly corrosive, so the strength and Corrosion resistance has high requirements, and materials with high strength and strong corrosion resistance are needed as supports to promote the development of heavy-duty gas turbines and aero engines. [0003] At present, nickel-based single crystal superalloys have been developed to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C30B29/52C30B11/00C30B33/02C22F1/10
CPCC22C19/056C22F1/10C30B11/00C30B29/52C30B33/02
Inventor 魏先平杨功显巩秀芳郭维华李海松杨明杨啊涛
Owner DONGFANG TURBINE CO LTD
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