EFFECTS OF La ON STRUCTURE AND PROPERTIES OF HEAVY RAIL STEEL

Abstract

Abstract: The mechanisms of La in heavy rail steel were studied by means of experimental measurements, microstructure observation and theoretical analysis in the present work. For heavy rail steel, the state and the content of La were measured, and the mechanisms and the effects of La on sulfide inclusions, microstructure and properties of steel were determined. Strip-like sulfides disappear in heavy rail steel with La/(O+S)>3.50, which is shown that the metallurgical function of modifying sulfide inclusions has been achieved by La. La can fine the grain size of the austenite in heavy rail steel. Under the experimental condition, the plasticity and the impacting toughness of heavy rail steel with 0.005wt% La can evidently be improved.

Key words: rare earth, heavy rail steel, microscopic structure

C.J. Liu, M.F. Jiang, Y.S. Wang, J.J. Chen , C.L. Li. EFFECTS OF La ON STRUCTURE AND PROPERTIES OF HEAVY RAIL STEEL[J]. Acta Metallurgica Sinica (English Letters), 2005, 18(6): 701-706 .

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EFFECTS OF La ON STRUCTURE AND PROPERTIES OF HEAVY RAIL STEEL

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