열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제36권1호
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  • Pages.7-14
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  • 2023
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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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반복 템퍼링이 AISI 4340 강의 미세조직과 기계적 특성에 미치는 영향

Effect of Multiple Tempering on Microstructure and Mechanical Properties of AISI 4340 Steel

  • 박정빈 (전북대학교 신소재공학부) ;
  • 전준협 (전북대학교 신소재공학부) ;
  • 이주헌 (전북대학교 신소재공학부) ;
  • 손승배 (전북대학교 신소재공학부) ;
  • 이석재 (전북대학교 신소재공학부) ;
  • 정재길 (전북대학교 신소재공학부)
  • Jungbin Park (Division of Advanced Materials Engineering, Jeonbuk National University) ;
  • Junhyub Jeon (Division of Advanced Materials Engineering, Jeonbuk National University) ;
  • Juheon Lee (Division of Advanced Materials Engineering, Jeonbuk National University) ;
  • Seung Bae Son (Division of Advanced Materials Engineering, Jeonbuk National University) ;
  • Seok-Jae Lee (Division of Advanced Materials Engineering, Jeonbuk National University) ;
  • Jae-Gil Jung (Division of Advanced Materials Engineering, Jeonbuk National University)
  • 투고 : 2022.12.27
  • 심사 : 2023.01.19
  • 발행 : 2023.01.30
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초록

We investigated the effect of multiple tempering on the microstructure and mechanical properties of AISI 4340 steel. The austenitized and quenched AISI 4340 steels were tempered at 550, 600, and 650℃ for 1, 2, and 4 h by single-tempering (ST). The multiple tempering was conducted for 4 h by double-tempering (DT, 2 h + 2 h), and quadruple-tempering (QT, 1 h + 1 h + 1 h + 1 h). As tempering temperature increases, yield strength and ultimate tensile strength decrease and elongation increases due to recovery and recrystallization of martensite and coarsening of carbides. At 550℃, as the number of tempering cycles increases, the yield strength and tensile strength decrease at the expense of fracture elongation. At 600 and 650℃, the yield strength and tensile strength increase with increasing the number of tempering cycles while fracture elongation maintains similar values. The multiple tempering at the same tempering time of 4 h improves the modulus of toughness at all tempering temperatures, which is presumed to be due to the change in carbide precipitation behavior by multiple tempering.

키워드

과제정보

본 연구는 2022년도 산업통상자원부 재원으로 한국산업기술진흥원(KIAT) '산업혁신인재성장지원사업'의 지원을 받아 수행된 연구임(과제번호: P0002019).

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