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2026 Vol.36, Issue 2

Research Paper

Hot Deformation Behavior of PH13-8Mo Stainless Steel

PH13-8Mo 스테인리스강의 고온 변형 거동

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 February 2026. pp. 45-54
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Abstract

This study investigated the hot deformation behavior and microstructural evolution of PH13-8Mo precipitation-hardening stainless steel. Hot compression tests were performed at temperatures ranging from 900 to 1,200 °C and strain rates of 0.01 to 10 s-1. Constitutive equations based on the Zener-Hollomon parameter were established by considering the compensation of strain, where the material constants were fitted with 6th-order polynomials. The established model showed high predictability with a correlation coefficient of 0.994 and an average absolute relative error of 4.39 %. A hot processing map was developed based on the Dynamic Materials Model, identifying unstable regions characterized by negative instability criteria under low-temperature/high-strain-rate conditions, as well as specific moderate-rate zones. Electron backscatter diffraction (EBSD) integrated analysis [inverse pole figure (IPF), kernel average misorientation (KAM), and grain orientation spread (GOS)] revealed that while dynamic recrystallization promoted grain refinement through necklace structures at 900 °C and 0.01 s-1, high-temperature deformation at 1,200 °C led to significant grain coarsening and high transformation-induced stress. Furthermore, regions of instability were confirmed to cause flow localization and strain hotspots, detrimental to structural integrity. Consequently, the moderate temperature region around 1,100 °C with a low strain rate is proposed as the optimal window for achieving uniform and stable prior austenite grain structures.

Keywords
PH13-8Mo stainless steel
hot compression test
constitutive equation
processing map
microstructural evolution
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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 :2
  • Pages :45-54
  • Received Date : 2025-12-26
  • Revised Date : 2025-12-26
  • Accepted Date : 2026-01-05
  • DOI :https://doi.org/10.3740/MRSK.2026.36.2.45
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