Oxide dispersion strengthened (ODS) steel preparing method and martensitic steel

A martensitic steel and dispersion strengthening technology, applied in the preparation of oxide dispersion strengthened steel, ODS low activity martensitic steel, martensitic steel field, can solve the problems of long process flow, high manufacturing cost, and prominent material heterogeneity and other problems, to achieve the effect of short process flow and low manufacturing cost

Active Publication Date: 2016-01-27
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0003] There are the following main problems in the preparation of ODS steel by mechanical alloying: first, limited by the mechanical alloying process, the output of a sin

Method used

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  • Oxide dispersion strengthened (ODS) steel preparing method and martensitic steel
  • Oxide dispersion strengthened (ODS) steel preparing method and martensitic steel
  • Oxide dispersion strengthened (ODS) steel preparing method and martensitic steel

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Example Embodiment

[0039] The present invention is a preparation method of ODS steel. The basic principle is based on the strong binding energy between rare earth element RE and O. Its standard molar formation enthalpy is higher than the formation enthalpy of oxides of other alloying elements, and it is very easy to form stable rare earth oxidation. Through the timing of adding rare earth elements and the way of introducing oxygen, the rare earth elements combine with oxygen to form fine oxide particles. For example, adding an appropriate amount of iron oxide to the mold, adding an appropriate amount of rare earth element yttrium to the fully deoxidized molten steel and casting quickly, the yttrium in the molten steel takes the oxygen in the iron oxide to form yttrium oxide, which is dispersed in the molten steel. By controlling the oxygen content in the molten steel and the added amount of rare earth elements, smelted ODS steel with evenly dispersed rare earth oxides is obtained. The rare earth ...

Example Embodiment

[0048] Example 1:

[0049] A kind of ODS martensitic steel prepared based on the above method, and its various components account for the percentage of total mass:

[0050] C: 0.09%, Cr: 8.9%, Mn: 0.51%, W: 2.09%, N: 0.055%, Ta: 0.12%, Ti: 0.45%, Si: 0.13%, V: 0.045%, Y: 0.07%, B 2 O 3 :0.14%; finished products are made through the following steps:

[0051] (a) According to S1-S4 in the preparation method of the present invention, vacuum smelting prepares steel ingots or continuous casting steel bars, with the following components in percentage of the total mass:

[0052] C: 0.09%, Cr: 8.9%, Mn: 0.51%, W: 2.09%, N: 0.055%, Ta: 0.12%, Ti: 0.45%, Si: 0.13%, V: 0.045%, Y: 0.07%, B 2 O 3 : 0.14%.

[0053] (b) Perform the first thermal deformation through forging or rolling of steel ingots or continuously cast steel bars to obtain semi-finished products;

[0054] (c) Heating the semi-finished product to 1150°C to austenitize, and deform it again by hot rolling until the required shape and s...

Example Embodiment

[0062] Example 2:

[0063] A kind of ODS martensitic steel prepared based on the above method, and its various components account for the percentage of total mass:

[0064] C: 0.09%, Cr: 9.3%, Mn: 0.55%, W: 2.5%, N: 0.06%, Ta: 0.19%, Ti: 0.53%, Si: 0.13%, V: 0.045%, Y: 0.2%, B 2 O 3 : 0.4%; finished products are made through the following steps:

[0065] (a) According to S1-S4 in the preparation method of the present invention, vacuum smelting prepares steel ingots or continuous casting steel bars, with the following components in percentage of the total mass:

[0066] C: 0.09%, Cr: 9.3%, Mn: 0.55%, W: 2.5%, N: 0.06%, Ta: 0.19%, Ti: 0.53%, Si: 0.13%, V: 0.045%, Y: 0.2%, B 2 O 3 : 0.4%.

[0067] (b) Perform the first thermal deformation through forging or rolling of steel ingots or continuously cast steel bars to obtain semi-finished products;

[0068] (c) Heating the semi-finished product to 1200°C to austenitize, and deform it again by hot rolling until the required shape and size are...

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Abstract

The invention provides an oxide dispersion strengthened (ODS) steel preparing method and martensitic steel. The oxide dispersion strengthened steel preparing method includes the steps that iron oxides are added into a casting mould, a proper number of rare earth elements are added into a fully deoxidized molten steel, the mixture is rapidly cast into the casting mould, and the ODS steel is obtained through the reaction between the rare earth elements and the iron oxides. The martensitic steel is obtained by performing hot forging, hot rolling, hot machining and hot treatment on the ODS steel prepared through the method. The ODS steel prepared through the method is high in hardenability, the residual austenitic content is very low, and a full martensite structure can be obtained. W, V and Ta are strong carbide forming elements and have a remarkable strengthening effect, and the mechanical property is obviously higher than that of steel prepared through a traditional smelting technology. Meanwhile, the ductile-brittle transition temperature (DBTT) value is minus 80 DEG C and minus 90 DEG C, the good toughness of the traditional smelting technology is well inherited, and meanwhile good anti-radiation performance is achieved. By means of the ODS steel preparing method, the demands for preparing ODS steel in batches with stability, short process and low cost can be met.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a preparation method of oxide dispersion strengthened steel and a martensitic steel, and the martensitic steel is a kind of ODS low-activity martensite prepared according to the preparation method steel. Background technique [0002] The fine and uniformly distributed oxide disperse phase in oxide dispersion strengthening (ODS) steel not only significantly improves the high-temperature creep strength of the steel, but also plays a role in the tail of defects generated by irradiation, significantly improving Due to the radiation-resistant swelling ability of steel, ODS steel is considered to be the most promising steel for radiation-resistant nuclear power, and its preparation technology is a research hotspot. The ODS steels that have been reported so far are all prepared by powder metallurgy process. Through the mechanical alloying process of high-energy ball milling, ...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C38/28C22C33/04C21D8/02
Inventor 燕青芝洪志远
Owner UNIV OF SCI & TECH BEIJING
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