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

Document Type : Research Paper

Authors

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

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

References

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Journal of Ultrafine Grained and Nanostructured Materials
Volume 57, Issue 1
June 2024
Pages 75-81

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History

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

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