Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Multiple Tempering on Microstructure and Mechanical Properties of AISI 4340 Steel

반복 템퍼링이 AISI 4340 강의 미세조직과 기계적 특성에 미치는 영향

  • 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)
  • 박정빈 (전북대학교 신소재공학부) ;
  • 전준협 (전북대학교 신소재공학부) ;
  • 이주헌 (전북대학교 신소재공학부) ;
  • 손승배 (전북대학교 신소재공학부) ;
  • 이석재 (전북대학교 신소재공학부) ;
  • 정재길 (전북대학교 신소재공학부)
  • Received : 2022.12.27
  • Accepted : 2023.01.19
  • Published : 2023.01.30
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Abstract

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.

Keywords

Acknowledgement

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

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