ON THE ROLE OF PITCH DEFORMATION DURING γ – α MARTENSITIC TRANSFORMATIONS

10.25712/ASTU.1811-1416.2022.01.001

Authors

  • Mikhail P. Kashchenko Ural Federal University named after the first President of Russia B.N. Yeltsin, Mira Str., 19, Yekaterinburg, 620002, Russia; Ural State Forest Engineering University, Sybirskyi Tract Str., 37, Yekaterinburg, 620100, Russia https://orcid.org/0000-0002-2611-2858
  • Anna G. Semenovykh Ural State Forest Engineering University, Sybirskyi Tract Str., 37, Yekaterinburg, 620100, Russia https://orcid.org/0000-0003-3467-1833
  • Alexey V. Nefedov Ural State Forest Engineering University, Sybirskyi Tract Str., 37, Yekaterinburg, 620100, Russia https://orcid.org/0000-0002-1526-9163
  • Nadezhda M. Kashchenko Ural Federal University named after the first President of Russia B.N. Yeltsin, Mira Str., 19, Yekaterinburg, 620002, Russia https://orcid.org/0000-0003-2362-5567
  • Vera G. Chashchina Ural Federal University named after the first President of Russia B.N. Yeltsin, Mira Str., 19, Yekaterinburg, 620002, Russia; Ural State Forest Engineering University, Sybirskyi Tract Str., 37, Yekaterinburg, 620100, Russia https://orcid.org/0000-0002-7480-2562

Keywords:

martensitic transformations, orientation relations, Pitch deformation, polar decomposition of the tensor, martensite nanocrystals

Abstract

Orientational relations (OR) refer to a set of uniquely related morphological features indicating the cooperative nature of the martensitic transformation (MT). ORs demonstrate parallelism (or close to that) of the corresponding phase planes and directions lying in the planes. For γ – α MP in iron-based alloys with relatively large crystals of martensite, Groeninger-Troyano (GT) ORs are observed, which are close to the idealized Kurdyumov-Zaks (K-Z) and Nishiyama (N) ratios. The question of the possible role of Pitch ORs fixed in thin foils is considered in detail. Within the framework of crystal geometric analysis, it was shown that there are no grounds for choosing the Pitch deformation as preferable in relation to the traditional variants (Bain deformation with subsequent rotations), since this deformation leads to a large relative change in volume under MT. The polar decomposition of the Pitch distortion tensor demonstrates that tensile deformations exceed Bain's, causing high values of the volumetric effect. A qualitative conclusion has been made about the possible realization of Pitch OR for nanocrystals arising in strongly distorted retained austenite between relatively large crystals with OR G-Т. The expediency of confirming the formation of nanocrystals in the dynamic theory of magnetic fields is noted.

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Published

2022-03-31

How to Cite

Kashchenko М. П. ., Semenovykh А. Г. ., Nefedov А. В. ., Kashchenko Н. М. ., & Chashchina В. Г. . (2022). ON THE ROLE OF PITCH DEFORMATION DURING γ – α MARTENSITIC TRANSFORMATIONS: 10.25712/ASTU.1811-1416.2022.01.001. Fundamental’nye Problemy Sovremennogo Materialovedenia / Basic Problems of Material Science, 19(1), 9–16. Retrieved from http://ojs.altstu.ru/index.php/fpsm/article/view/127

Issue

Vol. 19 No. 1 (2022): Fundamental’nye problemy sovremennogo materialovedenia (Basic Problems of Material Science (BPMS))

Section

SECTION 1. CONDENSED MATTER PHYSICS