Preparation method of high-density oxide dispersion strengthened steel

A technology of dispersion strengthening and oxide, which is applied in the field of preparation of high-density oxide dispersion strengthening steel, and can solve the problems that the performance of ODS steel cannot meet the ideal requirements for use.

Active Publication Date: 2021-03-12
SHANGHAI UNIV
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Problems solved by technology

[0008] Aiming at the problem that the density of the nano-rare earth oxides in the ODS steel prepared by the existing conventional technology cannot meet the ideal use requirements due to the low density of the prepared ODS steel, the present invention provides a The preparation method of high-density oxide dispersion strengthened steel can prepare ODS steel with extremely high density nano-rare earth oxides, and the performance of the prepared ODS steel is greatly improved

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  • Preparation method of high-density oxide dispersion strengthened steel

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preparation example Construction

[0035] Such as figure 1 As shown, a method for preparing high-density oxide dispersion-strengthened steel uses a combination of smelting, rolling and heat treatment processes to prepare ODS steel, including the following steps:

[0036] 1. Put the steel matrix in the crucible for melting, vacuumize the furnace cavity, wash the gas twice under low vacuum conditions, and then pump high vacuum to 5×10 -3 Pa, and backfill with argon to 0.05MPa to form a protective atmosphere. Turn on the smelting power supply, adjust the current, observe the smelting situation, and wait until the steel raw materials in the crucible are completely melted to form a uniform molten steel. Add oxygen carrier particles directly into the molten steel, control the melting temperature to the set temperature (determined according to the melting point of the steel matrix), add oxygen carrier particles and then smelt for a certain period of time (determined according to the condition of the oxygen carrier part...

Embodiment 1

[0043] Option to use 316L as steel substrate, TiO 2 As the oxygen carrier particles, Y block is selected for rare earth, and 316L-ODS steel is synthesized by melting + solid state reaction.

[0044] The percentage of steel components in the total mass: C: 0.03%, Si: 1.00%, Mn: 2.00%, P: 0.045%, S: 0.03%, Cr: 16.0%, Ni: 12.0%, Mo: 2.00%, Y: 0.2%, Ti: 0.25%, and the balance is Fe and unavoidable impurities.

[0045] The specific operation steps are as follows:

[0046] 1. Put 316L in the crucible, vacuumize the furnace cavity, wash the gas twice under low vacuum conditions, and then pump high vacuum to 5×10 -3 Pa, and backfill with argon to 0.05MPa to form a protective atmosphere. Turn on the smelting power supply, adjust the current, and observe the smelting situation. The smelting temperature is about 1500°C, and the smelting time is 1 to 5 minutes. After the raw materials in the crucible are completely melted, the molten steel is smelted in the crucible. At this time, the...

Embodiment 2

[0050] Choose to use pure iron as the substrate, TiO 2 As the oxygen carrier particles, Er block is selected as the rare earth, and ODS steel is synthesized by smelting + solid state reaction.

[0051] The percentage of steel components in the total mass: C: 0.03%, Si: 1.00%, Mn: 2.00%, P: 0.045%, S: 0.03%, Cr: 16.0%, Ni: 12.0%, Mo: 2.00%, Er: 0.2%, Ti: 0.25%, and the balance is Fe and unavoidable impurities.

[0052] The specific operation steps are as follows:

[0053] 1. Put pure iron in the crucible, vacuumize the furnace cavity, wash the gas twice under low vacuum conditions, and then pump high vacuum to 5×10 -3 Pa, and backfill with argon to 0.05MPa to form a protective atmosphere. Turn on the smelting power supply, adjust the current, and observe the smelting situation. The smelting temperature is about 1600°C, and the smelting time is 1 to 5 minutes. After the raw materials in the crucible are completely melted, the molten steel is smelted in the crucible. At this ...

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Abstract

The invention discloses a preparation method of high-density oxide dispersion strengthened steel, and belongs to the field of metal material preparation. The method comprises the following steps that1, a steel base body is placed in a container to be smelted into molten steel, after the steel base body is completely smelted, oxygen carrier particles are added into the molten steel, smelting is continued to be conducted to enable the oxygen carrier particles and the molten steel to be mixed, and cooling is conducted to obtain a material ingot; 2, a steel base body is placed in a container to be smelted into molten steel, and after the steel base body is completely smelted, rare earth elements are added into the molten steel to form molten steel containing the rare earth elements; 3, the material ingot is added into the molten steel containing the rare earth elements to be smelted to enable the material ingot to be dissolved, oxygen carrier particles in the material ingot are partiallydissolved to obtain a melt, and the melt is cooled to obtain a casting blank; and 4, the casting blank is subjected to rolling and heat treatment to obtain ODS steel. According to the preparation method, the ODS steel with the nano rare earth oxide with extremely high density can be prepared, and the performance of the prepared ODS steel is greatly improved.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and more specifically relates to a preparation method of high-density oxide dispersion strengthened steel. Background technique [0002] Oxide dispersion strengthened steel, referred to as ODS steel, is a metal material with excellent high temperature creep properties and radiation resistance. There are a large number of dispersed oxide strengthening phases in ODS steel, which pin the dislocations and grain boundaries in the matrix through a large number of nano-sized oxide dispersion strengthening phases to hinder the dislocation slippage, thereby playing a strengthening role. In addition, these strengthening phases have excellent high-temperature stability and can maintain high performance for a long time in a large amount of ion and neutron irradiation environment. Therefore, in view of its excellent mechanical properties, high temperature stability and radiation resistance, ODS stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21C7/00C22C38/02C22C38/04C22C38/58C22C38/44C22C38/50
CPCC21C7/0006C21C7/0037C22C33/04C22C38/005C22C38/02C22C38/04C22C38/44C22C38/50C22C38/58
Inventor 宋长江沈楚伦张健康张云虎翟启杰
Owner SHANGHAI UNIV
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