Transformation strengthening by thermomechanical treatments in C-Mn-Ni-Nb steels

Sunghak Lee, Dongil Kwon, Young Kook Lee, Ohjoon Kwon

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)


The purpose of this study is to clarify the correlation between microstructural factors and mechanical properties of ultrafine steels processed by thermomechanical controlled treatments. Three steels deformed at high strain rates in a pilot plant rolling mill showed very fine ferritic microstructure, whose grains became more equiaxed and finer with increasing fraction of alloying elements, and had good tensile and fracture properties, although they contained only about 0.01 pct carbon. Especially in the Ni-added steel, tensile properties were greatly improved because of the high dislocation density and the fineness of the ferritic substructure, readily satisfying the requirements for commercial-grade high-strength, high-toughness steels. The formation of ultrafine equiaxed grains in the steels might be explained by a possible strain-induced dynamic transformation mechanism associated with the austenite → ferrite transformation caused by heavy deformation in the austenite range.

Original languageEnglish
Pages (from-to)1093-1100
Number of pages8
JournalMetallurgical and Materials Transactions A
Issue number5
Publication statusPublished - 1995 May

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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