DYNAMIC THEORY OF MARTENSITE FORMATION IN THE FORM OF A STACK OF CRYSTALS OF THE SAME ORIENTATION

10.25712/ASTU.1811-1416.2024.04.009

Authors

  • Nadezhda M. Kashchenko Ural Federal University named after the first President of Russia B.N. Yeltsin, 19 Mira St., Yekaterinburg, 620002, Russia https://orcid.org/0000-0003-2362-5567
  • Elena A. Korznikova Ufa University of Science and Technology, Zaki Validi St., 32, Ufa, 450076, Russia; Mirny Polytechnic Institute (branch) of North-Eastern Federal University named after M. K. Ammosov, Tihonov Str., 5/1, Mirny, 678170, Russia https://orcid.org/0000-0002-5975-4849
  • Mikhail P. Kashchenko Ural Federal University named after the first President of Russia B.N. Yeltsin, 19 Mira St., Yekaterinburg, 620002, Russia; Ural State Forest Engineering University, 37 Sybirskyi Tract St., Yekaterinburg, 620100, Russia https://orcid.org/0000-0002-2611-2858
  • Vera G. Chashchina Ural Federal University named after the first President of Russia B.N. Yeltsin, 19 Mira St., Yekaterinburg, 620002, Russia; Ural State Forest Engineering University, 37 Sybirskyi Tract St., Yekaterinburg, 620100, Russia https://orcid.org/0000-0002-7480-2562

Keywords:

dynamic theory, martensitic transformation, cooling martensite, dislocation nucleation centers, initial excited state, control wave process, habit plane, Bain deformation, packet martensite, stack of crystals, surface martensite

Abstract

The dynamic theory of spontaneous (on cooling) γ-α martensitic transformation is used to describe the formation of a stack of packet martensite crystals. The growth of a martensite crystal begins with the formation of an initial excited state (IES) in the elastic field of a dislocation nucleation center (DNC). The IES generates a control wave process (CWP) that carries a threshold deformation. The composition of the СWP includes relatively long-wave ℓ- and relatively short-wave s-waves acting in a coordinated manner and stimulating three-dimensional deformation of the Bain type. A pair of ℓ-waves specifies the orientation of the habit plane (HP). The packet martensite consists of lath-shaped crystals with HPs from the family close to {557}. Elastic fields of the DNC in the form of rectangular loops are considered. It is shown that the use of standard Burgers vectors b of mixed orientation relative to the <110> segments of the DNC leads to the removal of degeneracy in recording the habit. The elastic fields of the DNC*, a dislocation loop framing the HP of the formed crystal of lath-shaped martensite, are analyzed; the direction of the effective Burgers vector b* is used as the direction of the macroshear. It is shown that the DNC* creates conditions for the reproduction of crystals with the same orientations according to the relay scenario in the form of a stack of a certain spatial configuration. The results are discussed, and a conclusion is made about the possible initiation of the formation of not only crystals with HPs of the {557} type, but also {112}, which are typical of surface martensite.

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Published

2024-12-23

How to Cite

Kashchenko Н. М. ., Korznikova Е. А. ., Kashchenko М. П. ., & Chashchina В. Г. . (2024). DYNAMIC THEORY OF MARTENSITE FORMATION IN THE FORM OF A STACK OF CRYSTALS OF THE SAME ORIENTATION: 10.25712/ASTU.1811-1416.2024.04.009. Fundamental’nye Problemy Sovremennogo Materialovedenia / Basic Problems of Material Science, 21(4), 488–496. Retrieved from https://ojs.altstu.ru/index.php/fpsm/article/view/953

Issue

Vol. 21 No. 4 (2024): Fundamental’nye problemy sovremennogo materialovedenia (Basic Problems of Material Science (BPMS))

Section

SECTION 1. CONDENSED MATTER PHYSICS