Supercharge Your Innovation With Domain-Expert AI Agents!

A Heat Treatment Method for Recovering Properties of K417g Alloy

A heat treatment method and technology of performance, applied in the field of heat treatment of alloy materials, can solve the problems of long aging time, low cooling rate, low heat treatment temperature, etc., and achieve the effect of prolonging service life and simple heat treatment process

Active Publication Date: 2018-07-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the heat treatment temperature of the coarsened structure is too low, it will not be able to dissolve effectively, and if the temperature is too high, it will easily cause problems such as serious oxidation and grain boundary liquefaction.
The cooling rate after high temperature treatment should not be too low, otherwise γ′ will rapidly coarsen during the cooling process, resulting in a decrease in strength
The alloy after high temperature treatment needs to be aged at a suitable temperature to precipitate the strengthening phase at the grain boundary, otherwise the intragranular strength is too high and the plasticity will be seriously reduced; the aging time is too long, the cost is too high, and the equipment occupancy rate is high, which is not conducive to popularization and application

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Heat Treatment Method for Recovering Properties of K417g Alloy
  • A Heat Treatment Method for Recovering Properties of K417g Alloy
  • A Heat Treatment Method for Recovering Properties of K417g Alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In the present embodiment, the heat treatment method that makes the performance recovery of K417G alloy is as follows:

[0041] After being kept at 1240°C for 1 hour, it was cooled to 800°C for 100 minutes, and kept at 800°C for 16 hours, then air-cooled to room temperature. The tissue of the sample is as follows: image 3 shown. It can be seen that the γ′ phase of the alloy has a large amount of precipitation and a small size, and there is a certain amount of M at the grain boundary. 23 C 6 phase out. The performance test results are shown in Table 2. The 900°C tensile strength, 760°C and 950°C durability properties of the alloy have been significantly improved, and excellent comprehensive performance has been obtained.

[0042] Table 2 Mechanical properties of air-cooled samples after being kept at 1240°C for 1h and then furnace cooled for 100min to 800°C for 16h

[0043]

Embodiment 2

[0045] In the present embodiment, the heat treatment method that makes the performance recovery of K417G alloy is as follows:

[0046] After holding at 1240°C for 1 hour, cool to 850°C for 100 minutes, and hold at 850°C for 16 hours, then air cool to room temperature. The tissue of the sample is as follows: Figure 4 shown. It can be seen that the γ′ phase of the alloy has a large amount of precipitation and a small size, and there is a certain amount of M at the grain boundary. 23 C 6 phase out. The performance test results are shown in Table 3. The 900°C tensile strength, 760°C and 950°C durability properties of the alloy have been significantly improved, and excellent comprehensive performance has been obtained.

[0047] Table 3 Mechanical properties of air-cooled samples after being kept at 1240°C for 1h and then furnace cooled for 100min to 850°C for 16h

[0048]

Embodiment 3

[0050] In the present embodiment, the heat treatment method that makes the performance recovery of K417G alloy is as follows:

[0051]After being kept at 1240°C for 1 hour, it was cooled to 900°C for 100 minutes, and kept at 900°C for 5 hours, and then air-cooled to room temperature. The tissue of the sample is as follows: Figure 5 shown. It can be seen that the γ′ phase of the alloy has a large amount of precipitation and a small size, and there is a certain amount of M at the grain boundary. 23 C 6 phase out. The performance test results are shown in Table 4. The 900°C tensile strength, 760°C and 950°C durability properties of the alloy have been significantly improved, and excellent comprehensive performance has been obtained.

[0052] Table 4 Mechanical properties of air-cooled samples after being kept at 1240°C for 1h and then furnace cooled for 100min to 90°C for 16h

[0053]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention specifically relates to a heat treatment method capable of realizing performance recovery of K417G alloy, belonging to the field of heat treatment of alloy materials. The method is applicable to recovery of the excellent performance of a K417G alloy material which has attenuated performance due to long-term usage. The method comprises the following steps: (1) heating K417G alloy in a furnace or charging the furnace with the K417G alloy when the K417G alloy reaches a desired temperature and maintaining a temperature of 1230 to 1250 DEG C for 0.1 to 2 h; (2) after completion of heat preservation, cooling the K417G alloy in the furnace at a cooling rate of no less than 1 DEG C / min; and (3) maintaining the K417G alloy at a temperature of 750 to 900 DEG C for 1 to 20 h and then carrying out air cooling. According to the invention, high-temperature solid-solution treatment is carried out so as to realize redissolution of a coarsened gamma' phase and a M<23>C<6> phase; then a crystal boundary and the distribution state of intracrystalline strengthening phases are controlled by adopting a proper cooling rate and aging treatment, so the tensile strength and endurance properties of the alloy are recovered; thus, a K417G casting having served for a long time is allowed to regain excellent performance after simple heat treatment, so the service life of components is prolonged.

Description

technical field [0001] The invention relates to the field of heat treatment of alloy materials, in particular to a heat treatment method for recovering the properties of K417G alloys, which is suitable for regaining excellent properties of K417G alloy materials whose properties have been attenuated due to long-term use. Background technique [0002] K417G alloy is a high γ′〔Ni 3 The age-strengthened nickel-based cast superalloy with (Al, Ti)] phase content has excellent comprehensive properties and is mainly used to prepare hot end parts in aero-engines. At present, the parts prepared by K417G alloy are mainly cast, no heat treatment is required, and they are directly used after processing. After long-term service at high temperature, the main strengthening phase γ′ in the alloy is coarsened, the grain boundaries are widened, and the carbides are decomposed, resulting in a gradual decrease in the performance of the parts. General parts can only be scrapped after being used...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/10
CPCC22F1/10
Inventor 祁峰孙文儒于连旭于兴福张伟红刘芳信昕贾丹杨国良廉心桐郑丹丹郭守仁胡壮麒
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com