Method for characterizing hot crack sensitivity and hot crack sensitive temperature of high-temperature alloy powder

A high-temperature alloy and temperature-sensitive technology, which is applied in the preparation of test samples, measuring devices, instruments, etc., can solve the problems of difficulty in determining the hot cracking tendency of superalloy powder materials and the hot cracking sensitive temperature range, and achieve convenient in-situ observation. , The effect of high measurement accuracy and high test efficiency

Pending Publication Date: 2021-12-10
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the limitations of the existing technology that it is difficult to determine the hot cracking tendency and hot cracking sensitive temperature range of superalloy powder materials

Method used

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  • Method for characterizing hot crack sensitivity and hot crack sensitive temperature of high-temperature alloy powder
  • Method for characterizing hot crack sensitivity and hot crack sensitive temperature of high-temperature alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Step 1. Prepare Ni-Co-Cr-W-Mo-Ta-Al-Ti-B-Zr-Nb-C multi-element nickel-based superalloy powder by argon atomization, and pass the prepared metal powder through Mechanical vibrating sieving machine sieves to 63-105μm;

[0045] Step 2. Use the coaxial powder feeding additive manufacturing equipment to screen the superalloy powder material in the sieved particle size section for thermal cracking tendency. The laser power is 700w, and the alloy components that are printed and cracked are selected;

[0046] Step 3. Put the superalloy powder of the selected composition into the stainless steel sheath for degassing, welding and sealing. The diameter of the stainless steel sheath is 10mm, the length is 100mm, and the vacuum degree is -3 Pa;

[0047] Step 4. Put the loose powder in the package into the heat treatment furnace and heat it to different temperatures (1100, 1165, 1220, 1250, 1300°C) in the range of 900°C-1500°C, keep it warm for 30s, and then take it out quickly (<2s)...

Embodiment 2

[0054] Step 1. Prepare Ni-Co-Cr-W-Mo-Ta-Al-Ti-B-Zr-Nb-C multi-element nickel-based superalloy powder by argon atomization, and pass the prepared metal powder through Mechanical vibrating sieving machine sieves to 63-105μm;

[0055] Step 2. Use the coaxial powder feeding additive manufacturing equipment to screen the superalloy powder material in the sieved particle size section for thermal cracking tendency. The laser power is 700w, and the alloy components that are printed and cracked are selected;

[0056] Step 3. Put the superalloy powder of the selected composition into the stainless steel sheath for degassing, welding and sealing. The diameter of the stainless steel sheath is 10mm, the length is 100mm, and the vacuum degree is -3 Pa;

[0057] Step 4. Put the loose powder in the package into the heat treatment furnace and heat it to different temperatures (1100, 1165, 1220, 1250, 1300°C) in the range of 900°C-1500°C, keep it warm for 30s, and then take it out quickly (<2s)...

Embodiment 3

[0065] Step 1. Prepare Ni-Co-Cr-W-Mo-Ta-Al-Ti-B-Zr-Nb-C multi-element nickel-based superalloy powder by argon atomization, and pass the prepared metal powder through Mechanical vibrating sieving machine sieves to 63-105μm;

[0066] Step 2. Use the coaxial powder feeding additive manufacturing equipment to screen the superalloy powder material in the sieved particle size section for thermal cracking tendency. The laser power is 700w, and the alloy components that are printed and cracked are selected;

[0067] Step 3. Put the superalloy powder of the selected composition into the stainless steel sheath for degassing, welding and sealing. The diameter of the stainless steel sheath is 10mm, the length is 100mm, and the vacuum degree is -3 Pa;

[0068] Step 4. Put the loose powder in the package into the heat treatment furnace and heat it to different temperatures (1100, 1165, 1220, 1250, 1300°C) in the range of 900°C-1500°C, keep it warm for 30s, and then take it out quickly (<2s)...

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Abstract

The invention relates to a method for characterizing hot crack sensitivity and hot crack sensitive temperature of high-temperature alloy powder. The method comprises the following steps: screening the hot crack sensitivity of a powder material by adopting laser cladding, carrying out heating and thermal insulating on the powder material containing components which are easy to generate hot cracks, and then quenching and cooling to obtain grain size characteristic parameters of the powder under different temperature conditions; carrying out hot isostatic pressing at a temperature lower than the transition critical temperature of dendrites and isometric crystals of the component powder, carrying out metallographic sample grinding, and scanning the surface of a metallographic sample through a laser heat source according to different process parameters; searching a hot crack region near a metallographic grinding surface laser scanning region through image recognition, measuring the grain size and microcrack density of the region, evaluating the hot crack sensitivity of a material, and comparing the measured grain size characteristic parameters corresponding to powder at different temperatures in a protection atmosphere; and searching temperatures with similar grain sizes of the two samples to obtain a hot crack sensitive temperature interval. According to the invention, the limitation that the heat crack sensitive temperature interval of the high-temperature alloy powder material is difficult to determine in the prior art is solved.

Description

technical field [0001] The invention belongs to the field of superalloy powders for additive manufacturing, and relates to an evaluation and characterization method for thermal cracking sensitivity and sensitive temperature of superalloy powder materials. Background technique [0002] In recent years, additive manufacturing (3D printing) technology has begun to be applied to the preparation of complex superalloy structural parts for aerospace. High alloying, high γ' content (>50-60wt.% of γ') nickel-based superalloy is the main material of the current aero-engine rotating parts, the alloy is due to the high process temperature and high heating and cooling rate in the process of high energy beam additive manufacturing And high temperature gradient and other characteristics are prone to hot cracking defects, which has become one of the important reasons that limit the application of this type of material. How to effectively determine the hot cracking tendency and hot crack...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/2045G01N23/2251G01N23/2055G01N23/203G01N23/20058G01N23/2005G01N21/84G01N1/44G01N1/28
CPCG01N33/2045G01N21/84G01N23/2251G01N23/20058G01N23/203G01N1/44G01N1/28G01N23/2055G01N23/2005G01N2223/053G01N2223/056G01N2223/1016G01N2223/102
Inventor 郑亮李周肖程波
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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