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Nataliia Kovtun 832-AMS

PSACEA. Nataliia Kovtun 832-AMS. Materials Science Department “ USE OF STEELS WITH ACICULAR FERRITE STRUCTURE PURPOSED TO INCREASE POWER EFFICIENCY OF FREIGHT RAIL TRAFFIC” Scientific supervisor: Ph.D. O.Uzlov

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Nataliia Kovtun 832-AMS

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  1. PSACEA NataliiaKovtun832-AMS Materials Science Department “USE OF STEELS WITH ACICULAR FERRITE STRUCTURE PURPOSED TO INCREASE POWER EFFICIENCY OF FREIGHT RAIL TRAFFIC” Scientific supervisor: Ph.D. O.Uzlov Language supervisor: H. Syrtsova

  2. Brand New Materials: • high properties; • affordable cost. Energetics and Transport: • weight loss

  3. Acicular Ferrite in Steels • large austenite grain size; • the laths grow in different directions; • one particle - a nucleation place for several laths. Fig.1 The formation of the acicular ferrite structure [8]. [8]: S.S. Babu, H.K.D.H. Bhadeshia Mechanism of the Transition form Bainite to Acicular Ferrite; Materials Transactions

  4. The high degree of laths misorientation The active opposition to the main crack Fig 2: The main crack in the acicular ferrite structured steel [6] Fig 3: Distribution of misorientation angles in steel [11]: (a) packet bainite (b) acicular ferrite [6]: Ming-Chun Zhao, Ke Yang, Yiying Shan The effects of thermo-mechanical control process on microstructures and mechanical properties of a commercial pipeline steel [11]: J.S. Byun, J.H. Shim, J.Y. Suh et. al. Inoculated acicular ferrite microstructure and mechanical properties

  5. Two constructional steels have been investigated (0,21%C and 0,37%C) [7]: “acicular ferrite + TiN” Titanium nitrides do not operate as crack nucleation centers [7]: A. Echeveria, J.M. Rodriguez-Ibabe The Role of Grain Size in Brittle Particle Induced Fracture of Steels

  6. Mechanical properties of steel with different structural states [10] • Acicular ferrite: • the yield limit increases; • ductile characteristics slightly increase [10]: M.A. Linaza, J.L. Romero, J.M. Rodriguez-Ibabe et. al. Scripta Metallurgica and Materialia 29

  7. Conclusions • high strength and high impact toughness; • a possibility to abandon the expensive alloying elements (V, Nb, Ni, Mo, etc.); • work at low operating temperatures (low to -60°C); • work under conditions of considerable dynamic loads; • reducing the weight of freight cars;

  8. Thank You for your attention!

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