A Heat Treatment Process for Strengthening and Toughening Iron-Based Deformed Superalloys

A technology of deforming superalloys and strengthening and toughening, which is applied in the field of high-temperature metal structural materials, can solve the problems of limited increase in material costs, and achieve the effect of promoting the precipitation of precipitated phases and high nucleation rate

Active Publication Date: 2021-12-14
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The new iron-nickel-based superalloy has a higher temperature bearing capacity than austenitic heat-resistant steel, and has good high-temperature performance, and the material cost is limited compared with high-grade austenitic heat-resistant steel (such as HR3C). The overall cost performance is high, and it is expected Applied to the key high-temperature components of 650°C ultra-supercritical units, but there is no mature iron-nickel-based superalloy system in the existing technology that can meet the requirements of 650°C units

Method used

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  • A Heat Treatment Process for Strengthening and Toughening Iron-Based Deformed Superalloys
  • A Heat Treatment Process for Strengthening and Toughening Iron-Based Deformed Superalloys
  • A Heat Treatment Process for Strengthening and Toughening Iron-Based Deformed Superalloys

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]The alloy is smelted in a vacuum induction furnace, and the obtained alloy includes: Ni: 36%, Cr: 16%, Mn: 1.0%, Si: 0.05%, C: 0.06%, Mo: 0.8%; W: 0.4% , Ti: 2.1%; Al: 1.4%, and the balance is Fe. The alloy ingot is homogenized at 1170°C for 30 hours, and then thermally deformed at 1050°C. The total deformation is not less than 60%, and the final pass deformation is higher than 25%.

[0036] After the deformation of the alloy is completed, two-step solution treatment is carried out first, and the temperature is raised to 900°C at a rate of 10°C / min for 0.5 hours. Then, after heating at a rate of 10 °C / min to 900 °C for 0.5 hours, heating at a rate of 5 °C / min to 1000 °C for 0.5 hours and then water cooling. After the solution treatment is completed, the alloy is heated to 650°C and kept for 8 hours, and then air-cooled after completion. Finally, the alloy was heated to 800°C for 4 hours and cooled in air. Ni in the alloy after completion 3 The volume fraction of the ...

Embodiment 2

[0045] The alloy is smelted in a vacuum induction furnace, and the deformed alloy obtained includes: Ni: 25%, Cr: 15%, Mo: 0.5%; W: 0.8%, Ti: 2.5%; Al: 1.6%, Mn: 0.1%, Nb: 0.1%, Co: 1%, C: 0.03%, B: 0.001%, and the balance is Fe. The alloy ingot is homogenized at 1100°C for 50 hours, and then thermally deformed at 1020°C. The total deformation is not less than 60%, and the final pass deformation is higher than 25%.

[0046] Heat the deformed alloy from room temperature to 900°C at a rate of 10°C / min, and keep it warm for 0.5 hours, then continue to heat it up to 50°C above the carbide dissolution temperature at a rate of 5°C / min, hold it for 0.5 hours and then quench it with water cooling to room temperature;

[0047] Heat the treated alloy from room temperature to 900°C at a rate of 10°C / min, and keep it warm for 0.5 hours, then continue to heat it up to 50°C below the carbide precipitation temperature at a rate of 5°C / min, and hold it for 1 hour Cool to room temperature by...

Embodiment 3

[0051] The alloy is smelted in a vacuum induction furnace, and the deformed alloy obtained includes: Ni: 39%, Cr: 18%, Mo: 1%; W: 0.1%, Ti: 1.8%; Al: 1.2%, Mn: 0.5%, Co: 2%, Si: 0.02%, C: 0.1%, B: 0.005%, P: 0.01%, and the balance is Fe. The alloy ingot is homogenized at 1120°C for 45 hours, and then thermally deformed at 1120°C. The total deformation is not less than 60%, and the final pass deformation is higher than 25%.

[0052] Heat the deformed alloy from room temperature to 900°C at a rate of 10°C / min, and keep it warm for 0.5 hours, then continue to heat it up to 150°C above the carbide dissolution temperature at a rate of 5°C / min, hold it for 1 hour, and then quench it with water cooling to room temperature;

[0053] Heat the treated alloy from room temperature to 900°C at a rate of 10°C / min, and keep it warm for 0.5 hours, then continue to heat it up to 100°C below the carbide precipitation temperature at a rate of 5°C / min, and hold it for 0.5 hours Cool to room tem...

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Abstract

The invention discloses a heat treatment process for strengthening and toughening iron-based deformed superalloys, which includes two-step solid solution and two-step aging treatment: that is, heat preservation at 50-150°C above the carbide dissolution temperature for 0.5-1 hour; carbide precipitation temperature Insulation at 50-100℃ below for 0.5-1 hour; Ni 3 Insulate at 150-200°C for 8-16 hours below the Al phase precipitation temperature; Ni 3 Insulate for 3-8 hours at 30-70°C below the Al phase precipitation temperature; Ni in the alloy after completion 3 The volume fraction of the Al phase is higher than 10%, and the average diameter of the precipitated phase reaches 15±5nm. Wherein, when the Ni content in the alloy composition is higher than 32%, the volume fraction of the precipitated phase is not lower than 15%. The yield strength of the alloy at 650°C and 700°C is not lower than 600 and 650MPa, respectively, and the elongation is higher than 15% and 12% respectively.

Description

technical field [0001] The invention relates to the technical field of high-temperature metal structural materials, in particular to a heat treatment process for strengthening and toughening iron-based deformed superalloys. Background technique [0002] Coal-fired thermal power units provide more than 70% of domestic electricity, but domestic thermal power units have low average power generation efficiency and high energy consumption, and are the main emission sources of sulfur dioxide, nitride NOx, carbon dioxide and mercury. With the improvement of environmental protection requirements, it is necessary to significantly reduce and reduce the carbon dioxide emissions per unit of GDP. In the field of coal power, adopting high-parameter and large-capacity thermal power units is one of the most direct, economical and effective measures to realize the clean and efficient utilization of coal. At present, countries all over the world are actively developing 700°C advanced ultra-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/44C22C38/50C22C38/06C22C38/04C22C38/48C22C38/52C22C38/54C22C38/02C22C30/00C21D8/00C21D1/18
CPCC22C38/44C22C38/50C22C38/06C22C38/04C22C38/48C22C38/52C22C38/54C22C38/02C22C30/00C21D8/005C21D1/18C21D2211/004
Inventor 袁勇严靖博谷月峰张鹏杨征张醒兴
Owner HUANENG POWER INT INC
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