Important progress has been made in the research of low oxygen rare earth steel in my country

The electronic structure of rare earth elements is unique and has excellent physical and chemical characteristics such as magnetic, light, and electricity, and plays an important role in various materials. Since the addition of rare earths in the 1920s, a large number of studies at home and abroad have shown that trace rare earth has significantly improved the tough plasticity, abrasion, heat resistance, and corrosion resistance of steel.

Through more than ten years of mechanism research and industrial experiments, recently, the research team of Shenyang Materials Science National Research Center of the Institute of Metal Research of the Institute of Metals of the Chinese Academy of Sciences was inspired by the new mechanism of the preliminary oxygen bias, and found that the roots of rare earth steel performance fluctuations and poured outlets. It is oxygen content. By reducing the oxygen content in the steel and rare earth metals, they combined with experiments, computing, and representation revealing the key mechanism of rare earth in the steel, controlling the solid solution of mixed objects and rare earth, and preparing superior and stable low oxygen rare earth steel. Related research results were published in the "Natural Materials" of Nature magazine.

Comparison of mixed steel (left) in an imported bearing steel (left) and dual -hypoxia rare earth bearing steel (right)

Studies have found that not only the oxygen content in the steel liquid affects the performance of rare earth steel, but also more importantly, the oxygen content in rare earth metals ignored by the academic and industrial circles for a long time has a very important impact on the performance of rare earth steel. Because rare earth metals are extremely lively, large -sized rare earth oxides are easily formed when preparing rare earth metal electrolytes. These rare earth oxides are added to the steel fluid with rare earth metals. And respond to the refractory material to block the mouth.

Based on the above discovery, researchers have further developed the "dual hypoxia rare earth steel" technology, that is, the control technology of steel liquid hypoxic and rare earth metal hypoxia, which effectively solves the bottleneck problem in the application of rare earth steel industry. After being applied in the high -purity GCR15 bearing steel, compared with the bearing steel without rare earth, the rare earth bearing steel ± 800MPA pierced fatigue life increased by 40 times, and the 40%increased rolling fatigue life under the contact stress of 4.2GPa.

The study revealed the root cause of the performance fluctuations of rare earth steel. It is found that only the rare earth can stabilize the effects of deep purification steel in the steel under the conditions of low oxygen conditions, refine the change of miscellaneous objects and strong micro -alloy. This research shows that tons of steel only needs to add more than a hundred grams of light and rare earth, which can significantly improve the performance of the steel under the condition that the cost is basically not increased and the process process is basically not changed. The use of rare earth resources is of great significance to improve the quality of Youte Steel.

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