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Preparation method of oxygen supersaturation precursor powder for nano oxide dispersion strengthened steel

A nano-oxide and dispersion-strengthening technology, applied in the field of special material preparation, can solve the problems of difficult to achieve uniform distribution of oxides, no obvious improvement in wettability, large wetting angle of molten steel, etc., so as to solve the problem of floating slag, Avoid voids and inclusions, improve surface activity

Active Publication Date: 2020-04-21
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the density of oxides is smaller than that of molten steel, and the wetting angle with molten steel is large, directly added oxides are likely to segregate or float up to form slag due to density differences, and it is difficult to achieve uniform distribution of oxides
Patent CN107541666B (China) adds oxygen-saturated alloy powder prepared by mechanical alloying into molten steel, uses the characteristics of the density of the alloy powder and molten steel to achieve uniform mixing, and realizes the uniformity of nano-oxides by stirring and rapid cooling However, the density of the alloy added to the alloy powder is lower than that of pure iron, and there is still a certain difference between the density of the alloy powder and the molten steel, and the wettability between the alloy powder and the molten steel has not been significantly improved. According to National standard GB / T 22638 measures the infiltration angle of the supersaturated oxide dispersion alloy powder and T91 martensitic steel that its embodiment one step (1) makes and T91 martensitic steel 101 °, and the supersaturated oxide powder that embodiment two step (1) makes The wetting angle between oxide dispersed alloy powder and T91 martensitic steel is 97°

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of Oxygen Supersaturated Precursor Powder for Nano-oxide Dispersion Strengthening Steel

[0024] (1) By mass percentage, take 9% atomized chromium powder, 3% atomized titanium powder, 1% atomized yttrium powder, 5% yttrium trioxide powder and 82% atomized iron powder, atomized chromium powder , atomized titanium powder, atomized yttrium powder, diyttrium trioxide powder and atomized iron powder all have a mesh size of 100-300 mesh and a purity greater than 99.5%. After mixing, a composite alloy powder is obtained;

[0025] (2) join the composite alloy powder that step (1) obtains in the stirring ball mill, the mass ratio of the grinding ball in the stirring ball mill and the composite alloy powder is 10:1, fill into circulation argon gas then, open circulation cooling water, in Under the protection of argon, ball milling treatment is carried out. The time of ball milling treatment is 6 hours, the rotation speed is 250r / min, and the temperature does not excee...

Embodiment 2

[0029] Preparation of Oxygen Supersaturated Precursor Powder for Nano-oxide Dispersion Strengthening Steel

[0030] (1) By mass percentage, weigh 9% atomized chromium powder, 9% atomized titanium powder, 8% atomized tungsten powder, 1% atomized yttrium powder, 20% yttrium trioxide powder and 59% atomized iron Powder, atomized chromium powder, atomized titanium powder, atomized tungsten powder, atomized yttrium powder, yttrium trioxide powder and atomized iron powder have a mesh number of 100-300 mesh and a purity of more than 99.5%. After mixing , to obtain composite alloy powder;

[0031] (2) join the composite alloy powder that step (1) obtains in the stirring ball mill, the mass ratio of the grinding ball in the stirring ball mill and the composite alloy powder is 20:1, fill into circulation argon gas then, open circulation cooling water, in Under the protection of argon, ball milling treatment is carried out. The time of ball milling treatment is 4 hours, the rotation spe...

Embodiment 3

[0035] Preparation of Oxygen Supersaturated Precursor Powder for Nano-oxide Dispersion Strengthening Steel

[0036] (1) By mass percentage, weigh 12% atomized chromium powder, 5% atomized titanium powder, 4% atomized tungsten powder, 2% atomized yttrium powder, 13% diyttrium trioxide powder and 64% atomized iron Powder, atomized chromium powder, atomized titanium powder, atomized tungsten powder, atomized yttrium powder, yttrium trioxide powder and atomized iron powder have a mesh number of 100-300 mesh and a purity of more than 99.5%. After mixing , to obtain composite alloy powder;

[0037](2) join the composite alloy powder that step (1) obtains in the stirring ball mill, the mass ratio of the grinding ball in the stirring ball mill and the composite alloy powder is 15:1, fill into circulation argon gas then, open circulation cooling water, in Under the protection of argon, ball milling treatment is carried out. The time of ball milling treatment is 5 hours, the rotation s...

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Abstract

The invention discloses a preparation method of an oxygen supersaturation precursor powder for nano oxide dispersion strengthened steel. The method comprises the following steps of (1) taking an atomized chromium powder, an atomized titanium powder, an atomized tungsten powder, an atomized yttrium powder, a yttrium oxide powder and an atomized iron powder, and mixing to obtain a composite alloy powder; (2) adding the composite alloy powder obtained in the step (1) into a stirring ball mill, and carrying out ball milling treatment under protection of argon to obtain an oxygen supersaturated alloy powder; and (3) placing the oxygen supersaturated alloy powder obtained in the step (2) in an argon protection environment to be subjected to cooling treatment. The inventor finds that surface activity of the alloy powder can be effectively improved by adding the atomized yttrium powder; and an infiltration angle of the finally obtained oxygen supersaturation precursor powder for the nano oxidedispersion strengthened steel and matrix molten steel is less than 90 degrees, alloy powder agglomeration caused by poor wettability of the alloy powder in the molten steel is avoided, and rapid anduniform dispersion of the oxygen supersaturation precursor powder in the molten steel is facilitated.

Description

technical field [0001] The invention relates to the technical field of preparation of special materials, in particular to a method for preparing an oxygen supersaturated precursor powder for nano-oxide dispersion strengthening steel. Background technique [0002] Dispersion strengthening is one of the strengthening methods of materials. Compared with strengthening methods such as solid solution strengthening, strain strengthening, precipitation strengthening, and fine grain strengthening, dispersion strengthening breaks through the limitation of material recrystallization and maintains the strengthening effect near the melting point. Oxide dispersion strengthened steel (ODS steel) is an important kind of dispersion strengthened material. The fine and uniformly distributed oxide disperse phase in ODS steel can not only significantly improve the high-temperature creep strength of the steel, but also serve as the nucleation site of tiny helium bubbles, so that the transmuted he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/04C22C38/28C22C38/22
CPCB22F1/0003B22F9/04C22C38/28C22C38/22C22C38/005C22C38/002C22C32/0026B22F2009/043
Inventor 毛小东赵彦云宋亮亮刘少军黄群英
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI