期刊
ISIJ INTERNATIONAL
卷 55, 期 5, 页码 970-975出版社
IRON STEEL INST JAPAN KEIDANREN KAIKAN
DOI: 10.2355/isijinternational.55.970
关键词
cerium; inclusions; MgO center dot Al2O3 spinel; thermodynamic calculation; spring steel
资金
- Fundamental Research Funds for the Central Universities [FRF-TP-14-109A2]
- Beijing Higher Education Young Elite Teacher Project [YETP0349]
The effect of rare earth metal addition on the non-metallic inclusions in spring steel used in fastener of high speed railway was investigated by metallographic examination; SEM-EDS and component analysis, aiming at deform those harmful inclusions to improve service life of spring steel. MgO center dot Al2O3 inclusions were found in present experimental steel, which is also confirmed by the stability diagram of MgO/MgO center dot Al2O3/Al2O3 from thermodynamic consideration. After Ce addition, the evolution process of Al2O3 center dot MgO inclusions was determined through the surface and line scanning. The effects of time and Ce content on the evolution of Al2O3 center dot MgO inclusions were examined. It was indicated that Al2O3 center dot MgO inclusions were wrapped by rare earth inclusions to form a ring like shape Ce-riched band around the inclusion, which would be useful to improve fatigue and corrosion resistance of spring steel. It was found that diffusion of Ce3+, Al3+ and Mg2+ in inclusions core and intermediate layer would be the limited step during evolutions of inclusions.
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