Structural and textural heredity at gamma↔alpha transformations in low-carbon low-alloy pipe steel

Authors

  • M. L. Lobanov Ural Federal University, Ekaterinburg
  • S. V. Danilov Ural Federal University, Ekaterinburg
  • A. O. Struin Russian Research Institute of the Tube and Pipe Industries (RosNITI), Chelyabinsk
  • M. D. Borodina Ural Federal University, Ekaterinburg
  • I. Yu. Pyshmintsev Russian Research Institute of the Tube and Pipe Industries (RosNITI), Chelyabinsk

DOI:

https://doi.org/10.14529/met160207

Keywords:

low alloy pipe steel, EBSD, thermo-mechanical controlled processing, austenite, bainite, martensite, texture, orientation ratio, special boundaries

Abstract

The textural heredity in samples of low alloy pipe steel with a structure formed as a result of controlled thermo-mechanical treatment was studied by EBSD.

The samples were subjected to various heat treatments, including double phase recrystallization to produce bainite and martensite structures. The final texture of all samples regardless of processing basically repeated their original texture, obtained in the process of controlled thermomechanical treatment: two strongly pronounced orientations are close to {112} <110> and one orientation is close to (001) [110].

It is noted that the average size of regions with homogeneous crystallographic orientations obtained as a result of steel samples TMCP also “retained” as a result of heat treatment.

It was assumed that the mechanism of texture inheritance can be implemented by the reproduction of special misorientations – singular boundaries Σ3 and Σ11.These special misorientations were formed between stable orientations of austenite grains during hot rolling at a TMCP.

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Issue

Vol. 16 No. 2 (2016)

Section

Physical Chemistry and Physics of Metallurgical Systems