Role of Rare Earth in Low Sulphur Nb-Ti-Bearing Steel
来源期刊：JOURNAL OF RARE EARTHS2003年第1期
论文作者：高平祥 曾静 林勤 王跃华 刘继雄 朱兴元
Key words：metal materials; Nb-Ti-bearing steel; property; microstructure; inclusion; rare earths;
Abstract: The effect of rare earth on the microstructures, mechanical properties and inclusions in low sulphur Nb-Ti-bearing steel were investigated. It is shown that the transverse yield point, the traverse tensile strength and elongation of testing steels decrease initially and then rise with increasing content of rare earth. The impact energy values of the testing steels exhibit a contrary trend. Proper amount of rare earth in the steels can improve the anisotropy of impact toughness above -20 ℃ and it does not affect the type of microstructures which are still composed of ferrites and pearlites, but the pearlite amount increases. On one hand, rare earth cleans the molten steel and reduces the amount of inclusions; on the other hand, rare earth makes the inclusions spheroidizd, refined and dispersed, and thus improves the distribution of inclusions.
高平祥1，曾静2，林勤3，王跃华1，刘继雄2，朱兴元4
(1.Railway Engineering Equipment and Materials Works of Wuhan Iron and Steel Company, Wuhan 430083, China;
2.Center of Wuhan Iron and Steel Company, Wuhan 430080, China;
3.Physical Chemistry Department, University of Science and Technology Beijing, Beijing 100081, China;
4.Wuhan University of Technology, Wuhan 430070, China)
Abstract:The effect of rare earth on the microstructures, mechanical properties and inclusions in low sulphur Nb-Ti-bearing steel were investigated. It is shown that the transverse yield point, the traverse tensile strength and elongation of testing steels decrease initially and then rise with increasing content of rare earth. The impact energy values of the testing steels exhibit a contrary trend. Proper amount of rare earth in the steels can improve the anisotropy of impact toughness above -20 ℃ and it does not affect the type of microstructures which are still composed of ferrites and pearlites, but the pearlite amount increases. On one hand, rare earth cleans the molten steel and reduces the amount of inclusions; on the other hand, rare earth makes the inclusions spheroidizd, refined and dispersed, and thus improves the distribution of inclusions.
Key words:metal materials; Nb-Ti-bearing steel; property; microstructure; inclusion; rare earths;
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