Effect of structural parameters and nonmetallic inclusions on the impact strength of rail steel
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A reduction in the level of impact strength for quenched and tempered steel on introducing vanadium and titanium into it is caused by cementite platelet thickening and presence of dispersed V(C, N) and TiN particles. Microalloying with zirconium in the amounts studied does not affect steel structure and the level of impact strength.
Cases of a reduction in impact strength for rail steel to 15 J/cm2 are connected with presence in their structure of a large number of ductile oxide inclusions. Apparently, by being located along grain boundaries, they disrupt steel continuity. Formation of these inclusions may be connected with insufficient steel deoxidation.
KeywordsOxide Titanium Zirconium Vanadium Cementite
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