Method for removing prior particle boundary and hole defect of powder metallurgy high-temperature alloy

Inactive Publication Date: 2017-08-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0025]The present invention proposes to perform mechanical ball milling treatment on atomized powder to improve surface activity of the powder and remove internal hollow defects of powder particles, so as to remove prior boundaries, internal holes, and thermal induction holes of the powder particles, thereby improving comprehensive mechanical properties.
[0026]After ball milling treatment is performed on atomized powder, surfaces of the powder are activated, and powder with high surface activity is obtained, so that in thermosetting forming, prior boundaries of the powder can be effective removed to improve interface bonding strength. Powder deforms after ball milling, and internal hollow defects and condensation shrinkage cavities of powder particles are removed to obtain completely solid powder. A gas sealed in the so

Problems solved by technology

Defects, such as prior particle boundaries (PPB), internal holes, or thermal induction holes of a powder metallurgy high-temperature alloy are main defects of a powder high-temperature alloy, and are difficult to be removed once formed, and severely reduce mechanical properties of an alloy.
Simultaneously, since the blank is limited by a mold cavity, intracrystalline deformation of the blank in the state of pressure stress is difficult, and thus the development of various original microscopic defects in a deformed body can be inhibited.
Limited by processing factors, the effect of removing the prior boundaries of powder particles is limited, or industrial application cannot be implemented.
Therefore, the powder hollow defects are main sources of the hole defects of the powder high-temperature alloy.
A hollow center fo

Method used

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  • Method for removing prior particle boundary and hole defect of powder metallurgy high-temperature alloy
  • Method for removing prior particle boundary and hole defect of powder metallurgy high-temperature alloy

Examples

Experimental program
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Example

[0040]Comparative example: direct plasma sintering is performed on atomized powder to prepare Rene 104 nickel-based high-temperature alloy.

[0041]Plasma sintering is performed on gas atomized Rene 104 nickel-based pre-alloyed powder (components are Ni-13Co-16Cr-4Mo-4W-2.2Al-3.7Ti-0.77Nb (wt %)); processing parameters are: 1150° C. / 40 MPa / heat preservation for 5 min, and then solution treatment is performed; the solution treatment is performed at 1180° C. for 1 h, and furnace cooling is performed; and then aging treatment s performed at 815° C. for 8 h to obtain a nickel-based high-temperature alloy.

[0042]FIG. 1 is a microscopic structure of Rene 104 nickel-based high-temperature alloy prepared in this comparative example, and obvious prior particle boundaries can be observed. See parts indicated by 1 and 2 in FIG. 1.

Example

Embodiment 1

[0043]Gas atomized Rene 104 nickel-based pre-alloyed powder is put into a ball mill pot with a ball-to-powder ratio of 10:1, and ball milling is performed in a planetary ball mill for 1.5 h at a ball milling rotation speed of 250 r / min under protection of argon, to obtain ball milling nickel-based high-temperature alloy powder.

[0044]Plasma sintering is performed on ball milling nickel-based high-temperature alloy powder at 1150° C. / 40 MPa, and heat preservation is performed for 5 min, then solution treatment is performed; the solution treatment is performed at 1180° C. for 1 h, and furnace cooling is performed; then, aging treatment is performed at 815° C. for 8 h to obtain a nickel-based high-temperature alloy.

[0045]FIG. 2 is a scanning electronic microscope (SEM) diagram of a cross section of atomized powder of the present embodiment, and obvious hollow defects occur to some powder in FIG. 2. See parts indicated by 3, 4, 5, and 6 in FIG. 2. FIG. 3 is an SEM diagram of ...

Example

Embodiment 2

[0046]Gas atomized Rene 104 nickel-based pre-alloyed powder is put into a ball mill pot, and ball milling is performed in a stirring ball mill for 3 h at a ball milling rotation speed of 100 r / min under protection of argon, to obtain ball milling nickel-based high-temperature alloy powder.

[0047]Ball milling powder is put into a steel capsule; vacuuming and sealing welding are performed on the steel capsule; hot extrusion forming is performed at 1100° C. with an extrusion ratio of 10:1 to obtain a highly compact nickel-based alloy bar; finally, solution treatment is performed at 1115° C. for 1 h and performed at 1170° C. for 3 h and air cooling is performed; aging treatment is performed at 845° C. for 4 h and performed at 760° C. for 8 h and air cooling is performed, to obtain a nickel-based high-temperature alloy.

[0048]It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present disclosure without d...

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Abstract

A method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy. The method includes performing mechanical ball milling treatment on an atomized powder, thermosetting the powder to form a shape, and preparing a powder metallurgy high-temperature alloy.

Description

BACKGROUND[0001]1. Field of the Disclosure[0002]The disclosure relates to a method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy, and belongs to the powder metallurgy material field.[0003]2. Description of Related Art[0004]Defects, such as prior particle boundaries (PPB), internal holes, or thermal induction holes of a powder metallurgy high-temperature alloy are main defects of a powder high-temperature alloy, and are difficult to be removed once formed, and severely reduce mechanical properties of an alloy.[0005]With respect to the defect of prior particle boundaries of the powder metallurgy high-temperature alloy, Chinese patent CN102409276A discloses a method for removing prior particle boundaries of a powder metallurgy high-temperature alloy, comprising: performing high-temperature solution treatment on a powder metallurgy high-temperature alloy after direct hot isostatic pressing at a high-temperature solution treatment t...

Claims

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Application Information

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IPC IPC(8): B22F3/12C22C1/04
CPCC22C1/04B22F3/12B22F9/04B22F2998/10C22C1/0433B22F2009/043B22F3/15B22F3/20B22F3/105
Inventor LIU, ZUMINGSU, PENGFEIHUANG, BOYUNDUAN, QINGLONGGUO, YANGMA, MENGMEI
Owner CENT SOUTH UNIV
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