Journal of Ultrafine Grained and Nanostructured Materials

Journal of Ultrafine Grained and Nanostructured Materials

Grain refinement tracing of dynamic and metadynamic recrystallization for a Penetrator Steel

Document Type : Research Paper

Authors
Taher El-Bitar 1
Maha ElMeligy 1
Wojciech Borek 2
Saad Ebied 3
1 Plastic Deformation Dept., Central Metallurgical R&D Institute (CMRDI), 1st El-Felazaat St., Eltabeen, 11722 Helwan, Egypt;
2 Department of Engineering Materials and Biomaterials, Silesian University of Technology, 18A Konarskiego Street, 44-100 Gliwice, Poland
3 Production Engineering and Mechanical Design Department, Faculty of Engineering - Tanta University, Tanta 31527, Egypt
10.22059/jufgnsm.2024.01.09
Abstract
The present investigation is dealing with the evolution of simultaneous dynamic and metadynamic recrystallization (DRX)& (MDRX) phenomena by physical simulation for a 4-strock hot compression process, where flow curves were presented for each stroke. The primary alloy is a penetrator steel containing 0.3% C in addition to some Cr, Mo, Ni and 1.63 W. Calculated grain size after the onest of DRX & occurrence of MDRX decreases continuously with the increase of cumulative strain reaching to 0.289 µm. However, Electron Backscatter Diffraction (EBSD) investigation established that 99% of the grains, after the last compression stroke, were detected as <1.0 μm, with an average grain size 0.31 μm. Microstructure after simulation presents fine lath martensitic structure, coexisting with Cr-W carbides, which are crammed at the inter- martensite laths. Furthermore, 56% of the grains showed grain boundaries misoriention creating High Angle Grain Boundaries (HAGBs), which are promoting MDRX. The flow curve of each stroke definitely contains two complementary microstructure events, namely a DRX , and a MDRX phenomenon, where the peak stress (σp) of DRX is inversely proportional to the mean temperature of stroke.
Keywords
Hot Compression Simulation
Dynamic and Metadynamic Recrystallization
Electron Back Scatter Diffraction (EBSD)
HAGB& LAGB
Grain Refinement
Penetrator Steel
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Journal of Ultrafine Grained and Nanostructured Materials
Volume 57, Issue 1
June 2024
Pages 75-81

  • Receive Date 23 January 2024
  • Revise Date 28 April 2024
  • Accept Date 23 May 2024