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Preparation method of Ti5O9 nanoparticles formed in plain carbon steel

A nano-particle, ordinary carbon steel technology, applied in the field of iron and steel materials

Inactive Publication Date: 2014-01-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is rarely reported that the in-situ precipitated nano-dispersed oxide strengthening phase is obtained directly in the solidified structure of steel by alloy melting.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Alloy raw materials: Common carbon steel is used, C: 0.12wt.%, Mn: 0.50wt.%, Si: 0.30wt.%, S: 0.040wt.%, P: 0.035wt.%. The alloy weighs 7.8kg.

[0023] 2) Metal mold casting with internal ceramic coating is adopted, and the metal mold is heated to 200°C before pouring;

[0024] 3) In order to reduce air inhalation, heat the alloy raw material and graphite sprue cup to 200°C in a resistance furnace, keep it warm for 2 hours and dry it;

[0025] 4) Put the alloy raw material into the crucible, and install the mold on the centrifugal disc in the vacuum furnace. Then install the sprue cup bracket, sprue cup and ceramic filter. Align the nozzle of the sprue cup with the center of the gate on the mold. Close the furnace door and furnace cover, open the vacuum system to evacuate the furnace body, when the vacuum degree reaches 5×10 -1 Pa, turn off the vacuum system and fill with N 2 Gas up to 0.5MPa;

[0026] 5) The alloy is smelted by power transmission and heating. ...

Embodiment 2

[0031] 1) Alloy raw materials: Common carbon steel is used, C: 0.22wt.%, Mn: 0.50~1.4wt.%, Si≤0.35wt.%, S: 0.045wt.%, P: 0.045wt.%. The alloy weighs 7.8kg.

[0032] 2) Metal mold casting with internal ceramic coating is adopted, and the metal mold is heated to 200°C before pouring;

[0033] 3) In order to reduce air inhalation, heat the alloy raw material and graphite sprue cup to 200°C in a resistance furnace, keep it warm for 2 hours and dry it;

[0034] 4) Put the alloy raw material into the crucible, and install the mold on the centrifugal disc in the vacuum furnace. Then install the sprue cup bracket, sprue cup and ceramic filter. Align the nozzle of the sprue cup with the center of the gate on the mold. Close the furnace door and furnace cover, open the vacuum system to evacuate the furnace body, when the vacuum degree reaches 5×10 -1 Pa, turn off the vacuum system and fill with N 2 Gas up to 0.5MPa;

[0035]5) The alloy is smelted by power transmission and heating...

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Abstract

The invention belongs to the field of steel and iron materials, and relates to a preparation method of Ti5O9 nanoparticles formed in molten steel. The preparation method is characterized in that Phi 0.1-3 mm Fe-Ti alloy wires are added into molten plain carbon steel with oxygen concentration less than or equal to 100 PPM to obtain molten steel containing Ti and O, wherein a larger degree of supercooling is formed with temperature drop of Ti, solubility drop of O as well as a quicker cooling speed as precipitated-phase Ti5O9 alloy elements Ti and O higher than a melting point of a matrix alloy are contained; applying pressure in a container to form pressure fields, applying centrifugal force in melt or electromagnetically stirring to form flow fields, so that flow of molten metal is promoted. The melts forms flow, and linear flow velocity of the melt is not lower than 1.7m / s to inhibit the precipitated phase from growing, and a nano-straightened steel alloy is formed. The preparation method has the advantage that nano Ti5O9 can be directly formed in solidified alloy for facilitating improving strength of the steel without damaging the ductility and toughness of the steel.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and relates to a method for forming Ti in common carbon steel 5 o 9 Preparation method of nanoparticles. Background technique [0002] Nano-block metal materials have high strength, but their elongation is low. Nano-particle dispersion-strengthened metal materials can greatly increase the strength of the alloy while maintaining the elongation of the alloy, and its strengthening effect is better than that of traditional The micron-scale and sub-micron-scale second-phase particle dispersion strengthening used in the iron and steel industry, and the research on nano-dispersed phase-strengthened steel have become a hot spot in recent years. Nano-strengthening can not only greatly improve the strength of structural steel, but also improve the high-temperature creep performance of superalloys. Nanostrengthening technology has important application value for steel used in a wide range of field...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C33/04C21C7/00
Inventor 王自东汤浩陈晓华仇丽丽
Owner UNIV OF SCI & TECH BEIJING
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