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Segregation-enhanced type deforming high-temperature alloy and preparation process thereof

A technology for deforming high-temperature alloys and precipitation strengthening, which is applied in the field of high-temperature alloys, can solve problems such as alloy processing performance hazards, and achieve the effects of improving alloy structure stability, good structure stability, and improving thermal processing performance

Active Publication Date: 2020-07-07
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the above elements all have a great impact on the stability of the alloy structure, and the addition of C element can effectively improve the stability of the alloy structure and inhibit the precipitation of harmful phases, but excessive addition will further cause damage to the alloy processability

Method used

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  • Segregation-enhanced type deforming high-temperature alloy and preparation process thereof
  • Segregation-enhanced type deforming high-temperature alloy and preparation process thereof
  • Segregation-enhanced type deforming high-temperature alloy and preparation process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] By adjusting the content and proportion of strengthening elements added, and controlling the content of C element, a high-temperature alloy with good performance, structural stability and processing performance can be obtained. The alloy is smelted in a vacuum induction furnace, and the obtained alloy includes: C: 0.07%, Cr: 12.5%, Co: 15%, Mn: 0.3%, Si: 0.2%, Nb: 1.5%, Mo: 2.5%, W: 3.0%, Ti: 3.0%, Al: 4.0%, B: 0.002%, Zr: 0.02%, and the balance is Ni.

[0038]The alloy was homogenized at 1200°C for 24 hours, followed by high-temperature rolling at 150°C above the γ' melting temperature, with a total deformation of 50%. In order to avoid the influence of excessive temperature drop before rolling, which promotes the precipitation of a large amount of γ' phase, and the excessive internal stress of the ingot caused by too fast cooling rate, which will affect the subsequent deformation processing of the alloy, the alloy is subjected to homogenization treatment and the heati...

Embodiment 2

[0042] By adjusting the content and proportion of strengthening elements added, and controlling the content of C element, a high-temperature alloy with good performance, structural stability and processing performance can be obtained. The alloy is smelted in a vacuum induction furnace, and the obtained alloy includes: C: 0.07%, Cr: 12.1%, Co: 15%, Mn: 0.3%, Si: 0.2%, Nb: 1.5%, Mo: 3.0%, W: 3.0%, Ti: 2.5%, Al: 4.0%, B: 0.002%, Zr: 0.02%, and the balance is Ni.

[0043] The alloy was homogenized at 1200°C for 24 hours, followed by high-temperature rolling at 150°C above the γ' melting temperature, with a total deformation of 50%. In order to avoid the influence of excessive temperature drop before rolling, which promotes the precipitation of a large amount of γ' phase, and the excessive internal stress of the ingot caused by too fast cooling rate, which will affect the subsequent deformation processing of the alloy, the alloy is subjected to homogenization treatment and the heat...

Embodiment 3

[0046] By adjusting the content and proportion of strengthening elements added, and controlling the content of C element, a high-temperature alloy with good performance, structural stability and processing performance can be obtained. The alloy is smelted in a vacuum induction furnace, and the obtained alloy includes: C: 0.07%, Cr: 11.8%, Co: 15%, Mn: 0.3%, Si: 0.2%, Nb: 1.5%, Mo: 3.5%, W: 3.0%, Ti: 2.0%, Al: 4.0%, B: 0.002%, Zr: 0.02%, and the balance is Ni.

[0047] The alloy was homogenized at 1200°C for 24 hours, followed by high-temperature rolling at 150°C above the γ' melting temperature, with a total deformation of 50%. In order to avoid the influence of excessive temperature drop before rolling, which promotes the precipitation of a large amount of γ' phase, and the excessive internal stress of the ingot caused by too fast cooling rate, which will affect the subsequent deformation processing of the alloy, the alloy is subjected to homogenization treatment and the heat...

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Abstract

The invention provides a segregation-enhanced type deforming high-temperature alloy and a preparation process thereof. The segregation-enhanced type deforming high-temperature alloy is prepared from components in percent by mass including 0.03%-0.07% of C, 11%-14% of Cr, 10%-15% of Co, smaller than or equal to 0.5% of Mn, smaller than or equal to 0.5% of Si, 1.5%-2.0% of Nb, 2.5%-3.5% of Mo, 1.5%-3.0% of W, 2.0%-3.0% of Ti, 4.0%-4.5% of Al, smaller than or equal to 0.1% of Ta, smaller than or equal to 0.003% of B, smaller than or equal to 0.03% of Zr and the balance Ni. It is guaranteed that the alloy has good high-temperature strength in a segregation enhancing manner, meanwhile, the contents and the relative proportions of the elements such as Cr, W, Mo, Al and Ti are controlled, and itis guaranteed that the alloy has good structure stability and avoids segregation of harmful phases in the high-temperature service period. The alloy has good structure stability, and the grain size ofthe alloy is 50 micrometers-70 micrometers. Meanwhile, the alloy has excellent strength performance.

Description

technical field [0001] The invention belongs to the field of superalloys, and specifically relates to a precipitation-strengthened deformed superalloy and a preparation process thereof, which is especially suitable for key components in high-temperature service of advanced ultra-supercritical thermal power units, and can meet the requirements of superheaters / reheaters, main steam pipes, collectors, etc. Performance requirements for high-temperature components such as boxes. Background technique [0002] Materials are generally required to have good high-temperature strength and oxidation / corrosion resistance during high-temperature service, so as to ensure their excellent service life. For example, the superheater / reheater in the thermal power industry is required to meet the long-lasting life of 1000MPa for 100,000 hours at a service temperature of at least 50°C, and at the same time, it needs to have excellent anti-coal ash corrosion and anti-oxidation properties. However...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22F1/10
CPCC22C19/056C22F1/002C22F1/10
Inventor 严靖博杨征张醒兴谷月峰袁勇张鹏
Owner CHINA HUANENG GRP CO LTD
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