Alloy technology of adding Ce into bearing steel for inhibiting formation of TiN compound inclusion

An alloy technology and composite inclusion technology, which is applied in the field of alloy technology where Ce is added to suppress the formation of TiN composite inclusions in bearing steel, can solve problems such as poor lattice matching, achieve simple methods, broad application prospects, and improve fatigue life Effect

Inactive Publication Date: 2019-01-22
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

According to the research results of Park et al [Document 6: Metallurgical & Materials Transactions B, 2012,43(6):1550-1564.], Ce 2 o 3 Poor lattice matching with TiN inclusions

Method used

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  • Alloy technology of adding Ce into bearing steel for inhibiting formation of TiN compound inclusion
  • Alloy technology of adding Ce into bearing steel for inhibiting formation of TiN compound inclusion
  • Alloy technology of adding Ce into bearing steel for inhibiting formation of TiN compound inclusion

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Embodiment

[0060] According to the alloy process of adding Ce to bearing steel to suppress the formation of TiN composite inclusions according to the present invention, 5 groups of industrial examples were carried out. The smelting processes of the five groups of industrial examples are basically the same, the difference lies in the amount of rare earth Ce added, so they are described together here.

[0061] High-quality rare earth GCr15 bearing steel is produced in 30 (tons of steel) packages in a domestic steel factory. The production process is: EAF→LF→VD→die casting. The specific operation steps are as follows: (1) During the electric furnace smelting process, the oxygen blowing decarburization temperature during the oxidation period is 1612°C, the end point [C] is controlled at 0.74%, and the [Ti] content is controlled below 0.001%, and then the oxide slag is removed and remade Reduce the slag and carry out rough alloying to ensure that the main alloy elements such as [Cr] and [Mn] ...

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Abstract

The invention relates to the technical field of rare earth alloy, and provides an alloy technology of adding Ce into bearing steel for inhibiting formation of TiN compound inclusion. The alloy technology comprises the following steps: when a primary smelting furnace carries out steel tapping, making pre-smelted slags; in an LF (Ladle Furnace) refining process, making refining slags; at the end stage of vacuum smelting, adding rare earth Ce of which the adding amount is 0.15-0.75kg / (ton of steel); after the rare earth Ce is added, carrying out steel ladle bottom blowing Ar for soft stirring. According to the alloy technology, the rare earth Ce is added into bearing steel, MgAl2O4 in the steel is modified into a specific type of rare earth oxide (Ce2O3) or rare earth oxysulfide (Ce2O2S), andthe separation of the heterogeneous nucleation of TiN on MgAl2O4 in a solidification process is inhibited, the generated rare earth oxide or rare earth oxysulfide has a small size, and the hardness is far lower than that of MgAl2O4 inclusion. The obtained simple substance TiN inclusion has the advantages of small size and even distribution, and a new method is provided for improving the fatigue life of bearing steel.

Description

technical field [0001] The invention relates to the technical field of rare earth alloys, in particular to an alloy process for suppressing the formation of TiN composite inclusions by adding Ce to bearing steel. Background technique [0002] As one of the most important basic components, bearings are widely used in key equipment fields such as precision machine tools, high-end cars and high-speed trains. However, at present, my country's high-end bearings mainly rely on imports, so it is very urgent to improve the performance of my country's bearing steel as soon as possible. Fatigue damage is the main failure mode of bearings, and inclusions are closely related to the fatigue life of bearings, so minimizing the damage of inclusions is an important prerequisite for ensuring a long service life of bearings. [0003] With the strict control of oxide inclusions in high-quality bearing steel, the harm of large-size hard TiN inclusions to bearing steel has gradually become prom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/28C21C7/10
CPCC21C7/0006C21C7/10C22C33/04C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/28
Inventor 成国光黄宇王云鹏李世健代卫星杨亮苗志奇
Owner UNIV OF SCI & TECH BEIJING
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