Effects of Rare Earth on Structure and Mechanical Properties of Clean BNbRE Steel
来源期刊：JOURNAL OF RARE EARTHS2005年第4期
论文作者：JIANG Maofa Chen Jianjun Li Chunlong LIU Chengjun WANG Yunsheng
Key words：heavy rail steel; clean steel; microstructure; sulfide inclusion; property; rare earths;
Abstract: The mechanisms of RE in clean BNbRE steel were studied by means of experimental measurement, microstructural observation and theoretical analysis. For BNbRE steel, the state and the content of RE were measured, and the effects and the mechanisms of RE on sulfide inclusions, microstructure and properties of steel were determined. On the condition of increasing the cleanliness of steel, the mechanisms of RE in steel were changed to certain degree. Small amount of RE has the effect of cleaning, modifying inclusions and alloying in clean steel, too. With increasing the cleanliness of BNbRE steel, addition of RE should be decreased properly. Under experimental conditions, the optimum addition of RE is ～0.01%(mass fraction) for clean BNbRE steel, while RE can evidently improve plasticity and impact toughness of BNbRE steel.
JIANG Maofa1，Chen Jianjun1，Li Chunlong1，LIU Chengjun1，WANG Yunsheng1
(1.Institute of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;
2.Baotou Iron and Steel Group Corporation, Baotou 014010, China)
Abstract:The mechanisms of RE in clean BNbRE steel were studied by means of experimental measurement, microstructural observation and theoretical analysis. For BNbRE steel, the state and the content of RE were measured, and the effects and the mechanisms of RE on sulfide inclusions, microstructure and properties of steel were determined. On the condition of increasing the cleanliness of steel, the mechanisms of RE in steel were changed to certain degree. Small amount of RE has the effect of cleaning, modifying inclusions and alloying in clean steel, too. With increasing the cleanliness of BNbRE steel, addition of RE should be decreased properly. Under experimental conditions, the optimum addition of RE is ～0.01%(mass fraction) for clean BNbRE steel, while RE can evidently improve plasticity and impact toughness of BNbRE steel.
Key words:heavy rail steel; clean steel; microstructure; sulfide inclusion; property; rare earths;
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