Self-uniform grain refiner for bearing steel and preparation method thereof

A technology of uniform grain and refiner, applied in the field of grain refinement of metal materials, can solve the problems of high energy consumption, raw material oxidation, loss, etc., to increase the nucleation speed, reduce the grain boundary energy, and reduce the drive force effect

Active Publication Date: 2022-05-27
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under such high temperature conditions, it will not only consume a lot of energy to raise the temperature, but also inevitably oxidize the raw materials, resulting in a certain loss
Moreover, after the current grain refiner is added to the molten steel, it is difficult to ensure that the active ingredients of the refiner can be evenly distributed in the molten steel. grain effect

Method used

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  • Self-uniform grain refiner for bearing steel and preparation method thereof
  • Self-uniform grain refiner for bearing steel and preparation method thereof
  • Self-uniform grain refiner for bearing steel and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0024] Take the tempered bearing steel with grain refiner added, wherein the grain refiner is 0.2% of the total mass of the bearing steel, and its chemical composition (mass fraction wt%) is: C: 1.06, Si: 0.43, Mn: 0.42, Cr: 17.96, Ni: 0.54, Mo: 0.53, Mg: 0.0030, and the rest are Fe. Its grain size is shown in Table 1.

example 2

[0026] Take the tempered bearing steel with grain refiner added, wherein the grain refiner is 0.3% of the total mass of the bearing steel, and its chemical composition (mass fraction wt%) is: C: 1.07, Si: 0.42, Mn: 0.43, Cr: 18.09, Ni: 0.60, Mo: 0.51, Mg: 0.0110, and the rest are Fe. Its grain size is shown in Table 1.

example 3

[0028] Take the tempered bearing steel with grain refiner added, wherein the grain refiner is 0.3% of the total mass of the bearing steel, and its chemical composition (mass fraction wt%) is: C: 1.01, Si: 0.44, Mn: 0.40, Cr: 17.96, Ni: 0.58, Mo: 0.54, Mg: 0.0170, and the rest are Fe. Its grain size is shown in Table 1.

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Abstract

The invention relates to a novel bearing steel self-uniform grain refiner and a preparation method thereof. The novel bearing steel self-uniform grain refiner comprises Mg powder, Fe powder and Mg particles, and the Mg powder, Fe powder and Mg particles The mass ratio is 4.9-5.1:91.9-92.1:2.9-3.1, and the surface porosity of the compact of Fe, Mg powder and Mg particles should be kept at about 12%-15%. The new bearing steel grain refiner provided by the invention will produce a "micro-burst" effect when it is put into molten steel, so that the active ingredients in the refiner are self-uniformly distributed in molten steel, and the utilization of Mg in molten steel is improved Rate. Mg fills the grain boundary surface defects by segregating at the grain boundary, thereby reducing the surface tension on the two-phase interface, increasing the nucleation speed, reducing the grain boundary energy, and reducing the driving force for grain growth. The growth of grains is limited, and the strength, toughness and other properties of bearing steel are improved.

Description

technical field [0001] The invention belongs to the technical field of grain refinement of metal materials, and relates to a self-homogeneous grain refiner for bearing steel. Background technique [0002] Bearings are subjected to great pressure and friction during operation, so bearing steel is required to have high and uniform hardness and wear resistance, as well as high elastic limit. The requirements for the uniformity of the chemical composition of the bearing steel, the content and distribution of non-metallic inclusions, and the distribution of carbides are very strict, and it is one of the most stringent steel grades in all steel production. [0003] The grains in bearing steel are too coarse, which will reduce the number of grain boundaries inside the material, make the expansion of cracks easier, significantly affect the properties of the steel, and reduce the strength, plasticity and toughness of the steel. The reduction of the above mechanical properties will l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00
CPCC21C7/0006
Inventor 李阳马帅李花兵孙萌孙深姜周华李立业王琦
Owner NORTHEASTERN UNIV LIAONING
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