열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제37권4호
  • /
  • Pages.155-162
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  • 2024
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  • 1225-1070(pISSN)
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  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
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Nb 첨가 합금강의 미세조직과 결정립 조대화 거동

Microstructure and Abnormal Grain Coarsening Behavior of Nb-microalloyed Steel

  • 김성진 (전북대학교 신소재공학부) ;
  • 최정후 (전북대학교 신소재공학부) ;
  • 김민희 (전북대학교 신소재공학부) ;
  • 류민환 (전북대학교 신소재공학부) ;
  • 박재현 (전북대학교 신소재공학부) ;
  • 신재혁 (전북대학교 신소재공학부) ;
  • 신우철 (전북대학교 신소재공학부) ;
  • 김민욱 (세아베스틸 기술연구소) ;
  • 정재길 (전북대학교 신소재공학부) ;
  • 이석재 (전북대학교 신소재공학부)
  • Sungjin Kim (Division of Advanced Materials Engineering, Jeonbuk National University) ;
  • Jeonghu Choi (Division of Advanced Materials Engineering, Jeonbuk National University) ;
  • Minhee Kim (Division of Advanced Materials Engineering, Jeonbuk National University) ;
  • Minhwan Ryu (Division of Advanced Materials Engineering, Jeonbuk National University) ;
  • Jaehyun Park (Division of Advanced Materials Engineering, Jeonbuk National University) ;
  • Jaehyeok Sin (Division of Advanced Materials Engineering, Jeonbuk National University) ;
  • Woochul Shin (Division of Advanced Materials Engineering, Jeonbuk National University) ;
  • Minwook Kim (R&D Center, SeAH Besteel) ;
  • Jae-Gil Jung (Division of Advanced Materials Engineering, Jeonbuk National University) ;
  • Seok-Jae Lee (Division of Advanced Materials Engineering, Jeonbuk National University)
  • 투고 : 2024.05.17
  • 심사 : 2024.06.24
  • 발행 : 2024.07.30
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초록

SCr420H steel which is commonly utilized for automotive components requires the carburizing heat treatment process. Abnormal grain growth during this treatment significantly affects the mechanical properties of the steel parts. Consequently, a process designed to prevent abnormal grain growth at certain elevated temperatures is essential. For enhanced grain refinement, we considered the addition of Nb in SCr420H steel. The experimental condition of the carburizing heat treatment involved reheating the steel sample to temperatures between 940℃ and 1080℃. Using scanning electron microscopy, we examined the microstructure of specimens treated with the secondary solution, revealing an organization of bainite and ferrite. Transmission electron microscopy was utilized to determine the type, shape, and size of the carbonitrides, showing a high fraction of AlN at the secondary solution treatment temperature of approximately 1050℃ and of (Nb,Ti)(C,N) around 1200℃. AlN particles measured about 100 nm and (Nb,Ti)(C,N) about 50 nm. Optical microscopy was utilized to assess grain size variations at different secondary solution treatment temperatures. It is noted that the temperature at which abnormal grain coarsening occurred rose with increasing secondary solution treatment temperatures, indicating a greater influence of (Nb,Ti)(C,N) with higher heat treatment temperatures. This research provides reference data for preventing abnormal grain growth in Nb-added low alloy steels undergoing carburizing heat treatment.

키워드

과제정보

이 논문은 2024년도 정부(산업통상자원부)의 재원으로 한국산업기술진흥원의 지원을 받아 수행된 연구임 (RS-2024-00410332, 2024년 산업혁신인재성장지원사업).

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