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2026 Vol.36, Issue 1 Preview Page

Research Paper

Hot Deformation Behavior and Dynamic Recrystallization Characteristics of an Fe-24Mn Slab during Plane-Strain Compression

평면 변형 압축 시험을 이용한 Fe-24Mn 슬래브의 고온 변형 거동 및 동적 재결정 특성

Changwoo Lee1†
,
Byoungkoo Kim2
,
Jae Jun Lee1
이 창우1†
,
김 병구2
,
이 재준1
1Steel Pipe Technology Center, Pohang Institute of Materials Industry Advancement, Pohang 37923, Republic of Korea
2Advanced Energy Materials and Components R&D Group, Korea Institute of Industrial Technology, Busan 46938, Republic of Korea
1(재)포항소재산업진흥원 강관기술센터
2한국생산기술연구원 에너지소재부품연구그룹
†Corresponding author E-Mail : cw82.lee@pomia.or.kr (C. Lee, POMIA)
27 January 2026. pp. 31-43
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Abstract

This study investigated the hot deformation behavior and dynamic recrystallization (DRX) characteristics of a coarse-grained Fe-24Mn steel slab using plane strain compression (PSC) tests. Tests were conducted at 900-1,000 °C and strain rates of 0.5-10 s-1. Constitutive equations based on the Zener-Hollomon parameter accurately predicted flow stress (R=0.945). A processing map based on the Dynamic Materials Model (DMM) predicted flow instability at high strain rates (10 s-1) due to a negative strain rate sensitivity exponent. However, electron backscatter diffraction (EBSD) analysis revealed that these regions actually exhibited a fully recrystallized microstructure with low Kernel Average Misorientation (KAM) values, contradicting the DMM prediction. This discrepancy is attributed to adiabatic heating during high-speed deformation, which induces thermal softening and provides the driving force for DRX. Consequently, the region with negative power dissipation efficiency at high strain rates should be reinterpreted not as a failure zone, but as a window for efficient microstructural refinement. The study identifies 950 °C and 10 s-1 as the optimal processing conditions for grain refinement of the as-cast slab.

Keywords
plane strain compression test
high manganese steel
processing map
dynamic recrystallization
Gleeble system
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 36
  • No :1
  • Pages :31-43
  • Received Date : 2025-12-10
  • Revised Date : 2025-12-30
  • Accepted Date : 2026-01-06
  • DOI :https://doi.org/10.3740/MRSK.2026.36.1.31
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