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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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  • Abstract
  • Description
  • Claims
  • Application Information

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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 single batch is small, and the stability between batches is poor; second, the process flow is long and the manufacturing cost is high; Prominent problems of the opposite sex

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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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preparation example Construction

[0039]The invention is a preparation method of ODS steel. The basic principle is based on the strong binding energy between rare earth elements RE and O. Its standard molar enthalpy of formation is higher than that of oxides of other alloy 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, add an appropriate amount of iron oxide to the casting mold, add an appropriate amount of rare earth element yttrium to the fully deoxidized molten steel and cast it quickly. The yttrium in the molten steel captures the oxygen in the iron oxide to form yttrium oxide, which is dispersed in the molten steel. By controlling the oxygen content in molten steel and the addition of rare earth elements, the smelted ODS steel with uniform dispersion of rare earth oxides is obtained. The rare earth element in the pres...

Embodiment 1

[0049] A kind of preparation ODS martensitic steel based on above-mentioned method, its various compositions 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%, B2 o 3 : 0.14%; the finished product is made through the following steps:

[0051] (a) According to S1-S4 in the preparation method of the present invention, vacuum smelting is used to prepare steel ingots or continuously cast steel rods, with the following various components accounting for the 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%, B2 o 3 : 0.14%.

[0053] (b) first hot deformation by forging or rolling of ingots or continuously cast bars to obtain semi-finished products;

[0054] (c) heating the semi-finished product to 1150°C for austenitization, and deforming again by hot rolling until the required shap...

Embodiment 2

[0063] A kind of preparation ODS martensitic steel based on above-mentioned method, its various compositions 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%, B2 o 3 : 0.4%; the finished product is made through the following steps:

[0065] (a) According to S1-S4 in the preparation method of the present invention, vacuum smelting is used to prepare steel ingots or continuously cast steel rods, with the following various components accounting for the 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%, B2 o 3 : 0.4%.

[0067] (b) first hot deformation by forging or rolling of ingots or continuously cast bars to obtain semi-finished products;

[0068] (c) heating the semi-finished product to 1200°C for austenitization, and then deforming again by hot rolling until the required shape a...

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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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