A method for smelting nanoparticle dispersion strengthened steel

A dispersion strengthening and nanoparticle technology, applied in the field of iron and steel metallurgy, can solve the problems of difficult removal of modified products, hinder denaturation reaction, and deterioration of steel performance, and achieve the effects of fast melting rate, refined structure, and reduced quantity

Active Publication Date: 2016-06-22
SICHUAN UNIV
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Problems solved by technology

[0004] Calcium treatment is currently widely used to modify oxide inclusions in steel, which has a significant effect on Al in modified steel. 2 o 3 Inclusions can improve the properties of steel to a certain extent, but at the same time, they also face some difficulties
For example, the vapor pressure of calcium is very high, and its solubility in molten steel is very small; the oxide inclusions of calcium-based alloy modified aluminum are not easy to remove, and when the liquid phase is formed around the inclusion particles, It hinders the denaturation reaction, and the modified product CaO·Al 2 o 3 Not easily deformed, micro-cracks will be formed during high-grade hard wire cold drawing or rolling, resulting in deterioration of the properties of the steel

Method used

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  • A method for smelting nanoparticle dispersion strengthened steel
  • A method for smelting nanoparticle dispersion strengthened steel
  • A method for smelting nanoparticle dispersion strengthened steel

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Embodiment 1

[0071] Embodiment 1 is to add deoxidation modifier Ti, deoxidizer Al and typical inclusion Al to pure iron powder 2 o 3 Melting experiments.

[0072] The specific operation steps are as follows:

[0073] S100: Al, Al 2 o 3 , ferro-titanium powder and pure iron powder are ground evenly, and then compacted to obtain the original steel sample. The pure iron powder in this step is atomized iron powder, the composition is calculated by weight percentage, and the Fe content is more than 99%. Wherein the mass percentage composition of titanium iron powder is 5%, and the mass percentage composition of Al is 3% in the present embodiment, and Al 2 o 3 The mass percentage content is 3%.

[0074] S200: placing the original steel sample in a crucible, and putting the crucible in a magnetic levitation furnace for melting to obtain molten steel. During the melting process, the temperature of the magnetic levitation furnace is above 1500° C., and the melting time is 4 minutes. Melting...

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Abstract

The invention provides a method for smelting nanoparticle dispersion strengthened steel, comprising the following steps: S100: placing the material to be smelted in a smelting container, and then placing the smelting container in a magnetic levitation furnace for smelting treatment to obtain molten steel, In the smelting process, the temperature of the magnetic levitation furnace is above 1500°C, and the smelting time is greater than or equal to 0.5 minutes; wherein the material to be smelted contains large particle inclusions, and the material to be smelted contains titanium; S200: The nano particle dispersion strengthened steel can be obtained by cooling the molten steel. The invention realizes the use of a smelting method to obtain nanoscale (10nm) particle dispersion-strengthened super steel, and provides a new feasible process for the industrial-scale mass production of oxide dispersion-strengthened steel (ODS), which can greatly improve the strength of ODS steel Improve production efficiency and reduce the production cost of ODS steel.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a smelting method for strengthening steel by adopting nanoscale oxide precipitated particles to disperse and distribute on a steel matrix. Background technique [0002] The type, shape, size and distribution of inclusions in steel have an important impact on the properties of steel, and they mainly exist in a non-metallic state. Non-metallic inclusions in steel are submicroscopic defects inside the steel. When the size is large or the shape is irregular, it is easy to induce stress concentration or dislocation accumulation, resulting in mechanical instability of the steel during hot working or cold deformation. Uniformity, prone to fatigue or reduced strength and toughness. For most steel types, large inclusions with a size of 50 μm or more have an impact on the properties of the steel, and small inclusions with a size of 1 μm or less can be used as sulfides, carbides an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04
Inventor 黄青松段康佳袁熙志
Owner SICHUAN UNIV
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