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Treatment method for enhancing thermal fatigue property of forged Ni-Cr-Co based alloy

A processing method and a technology of base alloys, which are applied in the field of high-temperature alloy structural materials, can solve problems such as blank thermal fatigue performance of nickel-base superalloys, achieve great application value, improve thermal fatigue performance, and improve the effect of comprehensive mechanical properties

Active Publication Date: 2019-10-22
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the research on improving the thermal fatigue performance of nickel-based superalloys is still blank.

Method used

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  • Treatment method for enhancing thermal fatigue property of forged Ni-Cr-Co based alloy
  • Treatment method for enhancing thermal fatigue property of forged Ni-Cr-Co based alloy
  • Treatment method for enhancing thermal fatigue property of forged Ni-Cr-Co based alloy

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Experimental program
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Effect test

Embodiment 1

[0035] Preparation before processing: Cut the forged Ni-Cr-Co-based alloy into a cylindrical alloy sample with a diameter of 8mm and a height of 5mm by wire cutting machine, then ultrasonically clean it in alcohol for 10min, and dry it for use; the corundum crucible Put it at 700°C for 3 hours to dehumidify and set aside.

[0036] 1) High-temperature homogenization treatment: raise the temperature of the box-type furnace to 1250 ° C, and after the temperature is stable, put the crucible containing the alloy sample into the uniform temperature zone of the box-type furnace, and pass in argon gas for gas protection; alloy test The sample was kept in a box furnace for 9 hours, the gas protection was stopped, and it was air-cooled to room temperature after being released from the furnace;

[0037] 2) Pre-solution treatment: raise the temperature of the box furnace to 870 ° C, and after the temperature is stable, put the crucible containing the alloy sample that has been subjected to ...

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Abstract

The invention discloses a treatment method for enhancing the thermal fatigue property of a forged Ni-Cr-Co based alloy. The treatment method comprises the following steps of (1) high temperature homogenization treatment; (2) solid solution pretreatment; (3) predeformation treatment; (4) low-temperature annealing treatment; (5) multi-stage solid solution treatment; and (6) multi-stage ageing treatment. The alloy is subjected to a series of thermal treatment means and stretching treatment, the precipitation behavior and the existence state of two alloy phases are regulated and controlled by introducing defects of voids, dislocation and stacking fault, and the sizes, the distributions, the content and the morphologies of the alloy phases are adjusted by combination with the control to a thermal treatment cooling rate, so that the comprehensive mechanical property of the alloy is improved, the thermal fatigue property of the alloy is further improved, and the alloy is served in a harsher environment and has great application value.

Description

technical field [0001] The invention belongs to the field of high-temperature alloy structural materials, in particular to a treatment method for enhancing the thermal fatigue performance of a forged Ni-Cr-Co-based alloy. Background technique [0002] A superalloy is a metal material that can work for a long time above 600°C and under certain stress conditions. It has excellent high temperature strength, good fatigue performance, fracture toughness and other comprehensive properties. The characteristics of superalloys make them irreplaceable key materials in aero-engines. Many key components of aircraft engines are made of nickel-based superalloys. Due to the harsh working environment of aero-engines, which often need to work in a cycle of high and low temperature environments, there is an urgent need to improve the service temperature and comprehensive mechanical properties of superalloys. [0003] The current research direction is how to improve the oxidation resistance,...

Claims

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Application Information

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IPC IPC(8): C22F1/10C22F1/02C22F3/00C22C19/05
CPCC22C19/056C22F1/02C22F1/10C22F3/00
Inventor 夏兴川仉建波李京桉彭远祎何鑫陈学广丁俭
Owner HEBEI UNIV OF TECH
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