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A multi-scale and multi-phase dispersion-strengthened iron-based alloy and its preparation and characterization method

A technology for dispersion strengthening, iron-based alloys, applied in the field of powder metallurgy materials

Active Publication Date: 2020-03-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The design concept of this multi-scale multi-phase dispersion strengthened iron-based alloy (using nanometer and submicron scale strengthening phases to achieve intra-granular and grain boundary strengthening, using a variety of oxide dispersion strengthening), the use of mechanical ball milling to prepare alloy powder combined with hot extrusion The technology of forming and preparing multi-scale multi-phase dispersion-strengthened iron-based alloys has not been reported in the relevant literature

Method used

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  • A multi-scale and multi-phase dispersion-strengthened iron-based alloy and its preparation and characterization method
  • A multi-scale and multi-phase dispersion-strengthened iron-based alloy and its preparation and characterization method
  • A multi-scale and multi-phase dispersion-strengthened iron-based alloy and its preparation and characterization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Embodiment 1: Fe-14Cr-3W-0.4Ti-1.5Y 2 o 3 (wt.%) Alloy

[0095] Powder preparation:

[0096] First, weigh the gas-atomized Fe-14Cr-3W-0.4Ti (wt.%) iron-based pre-alloyed powder and Y 2 o 3A total of 150g of powder was put into a ball mill jar. Among them, the iron-based pre-alloyed powder particle size is less than or equal to 150μm, Y 2 o 3 Powder particle size is less than or equal to 45μm. According to the ball-to-material ratio of 10:1, the diameter of the grinding balls is 20mm:15mm:10mm:8mm:5mm:3mm=1:1:1:1:1:1, weigh 1500g of grinding balls and put them into the ball milling tank.

[0097] Step 2: Seal the ball mill tank, vacuumize it, the vacuum degree is less than or equal to 0.1Pa, and fill it with high-purity argon.

[0098] Step 3: Put the ball mill jar into the vertical planetary ball mill for mechanical ball milling; set the parameters of the mechanical ball mill, the rotation speed is 300r / min, and the mechanical ball milling time is 60h. During b...

Embodiment 2

[0115] Embodiment 2: Fe-14Cr-3W-0.4Ti-1.0Y 2 o 3 (wt.%) Alloy

[0116] Powder preparation:

[0117] First, according to the mass ratio of 99:1, weigh the gas-atomized Fe-14Cr-3W-0.4Ti (wt.%) iron-based pre-alloyed powder and Y 2 o 3 A total of 150g of powder was put into a ball mill jar. Among them, the iron-based pre-alloyed powder particle size is less than or equal to 150μm, Y 2 o 3 Powder particle size is less than or equal to 75μm. According to the ball-to-material ratio of 10:1, the diameter of the grinding balls is 20mm:15mm:10mm:8mm:5mm:3mm=1:1:1:1:1:1, weigh 1500g of grinding balls and put them into the ball milling tank.

[0118] Step 2: Seal the ball mill tank, vacuumize it, the vacuum degree is less than or equal to 0.1Pa, and fill it with high-purity argon.

[0119] Step 3: Put the ball mill jar into the vertical planetary ball mill for mechanical ball milling; set the parameters of the mechanical ball mill, the rotation speed is 320r / min, and the mechanic...

Embodiment 3

[0127] Embodiment 3: Fe-14Cr-3W-0.4Ti-2.0Y 2 o 3 (wt.%) Alloy

[0128] Powder preparation:

[0129] First, weigh the gas-atomized Fe-14Cr-3W-0.4Ti (wt.%) iron-based pre-alloyed powder and Y 2 o 3 A total of 150g of powder was put into a ball mill jar. Among them, the iron-based pre-alloyed powder particle size is less than or equal to 150μm, Y 2 o 3 Powder particle size is less than or equal to 45μm. According to the ball-to-material ratio of 10:1, the diameter of the grinding balls is 20mm:15mm:10mm:8mm:5mm:3mm=1:1:1:1:1:1, weigh 1500g of grinding balls and put them into the ball milling tank.

[0130] Step 2: Seal the ball mill tank, vacuumize it, the vacuum degree is less than or equal to 0.1Pa, and fill it with high-purity argon.

[0131] Step 3: Put the ball mill jar into the vertical planetary ball mill for mechanical ball milling; set the parameters of the mechanical ball mill, the rotation speed is 300r / min, and the mechanical ball milling time is 60h. During ...

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Abstract

The invention relates to a multi-scale and multi-phase dispersion-strengthened iron-based alloy and a preparation and characterization method thereof. The alloy contains a matrix and a strengthening phase; the strengthening phase includes at least two kinds of strengthening phase particles with different sizes; among the two kinds of strengthening phase particles with different sizes, the particles with a particle diameter of less than or equal to 50nm account for 85% of the total volume of all strengthening particles ~95%; the matrix is ​​Fe-Cr-W-Ti alloy; the strengthening phase includes Y 2 o 3 Crystal, Y‑Ti‑O phase, Y‑Cr‑O phase, Y‑W‑O phase. The characterization method is as follows: separating the strengthening phase in the alloy through electrolysis, and then using an electron microscope for characterization. The room temperature tensile strength of the alloy prepared by the invention is higher than 1600MPa, and the tensile strength of the alloy at 700°C is higher than 600MPa, and the comprehensive mechanical properties are obviously better than the same brand and the same type of alloy.

Description

technical field [0001] The invention relates to a multi-scale multi-phase dispersion-strengthened iron-based alloy and a preparation and characterization method thereof, belonging to the field of powder metallurgy materials. Background technique [0002] Oxide dispersion strengthened (ODS) iron-based alloys have excellent mechanical properties, oxidation resistance, and high-temperature corrosion resistance, and have broad application prospects in nuclear reactor structures and thermal processing equipment. [0003] At present, ODS alloys are mainly prepared by introducing oxides into the alloy matrix by mechanical alloying (MA), internal oxidation and other methods to prepare ODS alloys. Usually, Y 2 o 3 The oxide powder is mixed with the raw material powder, and dispersed into the powder by mechanical ball milling. During the subsequent forming and processing, the oxide is dispersed in the alloy matrix, resulting in strengthening [TOkuda, et al, J Mater Sci Lett 14 (1995...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/02C22C32/00B22F3/20B22F1/0545B22F1/145
CPCC22C32/0026C22C33/0207C22C33/0285B22F3/20B22F2003/208B22F1/145B22F1/0545B22F2003/248B22F2003/185B22F9/04B22F2009/043B22F2009/041B22F2998/10B22F2999/00B22F3/18B22F3/24C22C38/22C22C38/28B82Y25/00B82Y40/00B22F9/082C22C1/05B22F2201/11B22F2201/20B22F2301/35B22F2302/25B22F2304/054B22F2304/10B22F1/147
Inventor 刘祖铭李全黄伯云吕学谦彭凯赵凡
Owner CENT SOUTH UNIV
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