한국재료학회지 (Korean Journal of Materials Research)

  • 제34권1호
  • /
  • Pages.44-54
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  • 2024
  • /
  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
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고망간강 플랜지의 열간 단조 후 냉각방법에 따른 미세조직 및 기계적 특성 평가

Evaluation of Microstructure and Mechanical Properties according to Cooling Method after Hot Forging of High Manganese Steel Flange

  • 박민하 (한국생산기술연구원 에너지시스템그룹) ;
  • 이강호 (한국생산기술연구원 에너지시스템그룹) ;
  • 김병준 (한국생산기술연구원 에너지시스템그룹) ;
  • 김병구 (한국생산기술연구원 에너지시스템그룹)
  • Minha Park (Energy System Group, Korea Institute of Industrial Technology) ;
  • Gang Ho Lee (Energy System Group, Korea Institute of Industrial Technology) ;
  • Byung Jun Kim (Energy System Group, Korea Institute of Industrial Technology) ;
  • Byoungkoo Kim (Energy System Group, Korea Institute of Industrial Technology)
  • 투고 : 2023.10.24
  • 심사 : 2023.12.11
  • 발행 : 2024.01.27
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초록

High-Manganese (Mn) austenitic steel, with over 24 wt% Mn content, offers outstanding mechanical properties in cryogenic settings, making it a potential replacement for existing cryogenic materials. This high manganese steel exhibits high strength, ductility, and wear resistance, making it promising for applications like LNG tanks, flanges, and valves. To operate in cryogenic environments, hot forging and heat treatment processes are vital, especially in flange production. The cooling rate during high-temperature cooling after hot forging plays a critical role in influencing the microstructure and mechanical properties of high manganese steel. The rate at which cooling occurs during this process influences the size of the grains and the distribution of manganese and consequently has an impact on mechanical properties. This study assessed the microstructure and mechanical properties based on different cooling rates during the hot forging of High-Mn steel flanges. Comparing air and water cooling after hot forging, followed by heat treatment, revealed notable differences in grain size. These differences directly impacted mechanical properties such as tensile strength, hardness, and Charpy impact property. Understanding these effects is crucial for optimizing the performance and reliability of High-Mn steel in cryogenic applications.

키워드

과제정보

This study was supported by the R&D Program of the "Materials/Parts Technology Development Program" (20024858, Development of high manganese steel valves, flange, fitting parts for 40,000 m3-class liquid hydrogen transport system) through the Korea Planning & Evaluation Institute of Industrial Technology (KEIT).

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