Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Investigation of Changes in Structural Characteristics and Chemical Composition after Heat Treatment Process of JIS-SUJ2 Bearing Steel

JIS-SUJ2 베어링강의 열처리 이후 표면 및 심부에서 나타나는 구조적, 화학적 물성 변화

  • Donghee Lee (Department of Foundry Engineering, Dankook University) ;
  • Kyun Taek Cho (Powertrain Materials and Components Research Group, Korea Institute of Industrial Technology) ;
  • Hyeonmin Yim (Department of Energy Engineering, Dankook University) ;
  • Seung-Hwan Oh (Department of Energy Engineering, Dankook University) ;
  • Tae Bum Kim (Eco-friendly Heat Surface Treatment Research Division, Korea Institute of Industrial Technology) ;
  • Woo-Byoung Kim (Department of Foundry Engineering, Dankook University)
  • 이동희 (단국대학교 파운드리공학과) ;
  • 조균택 (한국생산기술연구원 동력소재부품연구그룹) ;
  • 임현민 (단국대학교 에너지공학과) ;
  • 오승환 (단국대학교 에너지공학과) ;
  • 김태범 (한국생산기술연구원 친환경열표면처리연구부문) ;
  • 김우병 (단국대학교 파운드리공학과)
  • Received : 2023.11.03
  • Accepted : 2023.12.12
  • Published : 2023.12.27
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Abstract

In this study, we designed and manufactured a large angular contact ball bearing (LACBB) with low deformation using JIS-SUJ2 steel and analyzed changes in its structural characteristics and chemical composition upon heat treatment. The bearing was produced by hot forging and heat treatment including a quenching and tempering (Q/T) process, and its properties were analyzed using 4 mm thick specimens. A difference in the size distribution of the carbide in the outer and inner parts of the bearing was observed and it was confirmed that large and non-uniform carbide was distributed in the inner part of the bearing. After heat treatment, the hardness value of the outer part increased from 13.4 HRC to 61 HRC and the inner part increased from 8.0 HRC to 59.7 HRC. As a result of X-ray diffraction (XRD) measurements, the volume fraction of the retained austenite contained in the outer part was calculated to be 3.5~4.8 % and the inner part was calculated to be 3.6~5.0 %. The surface chemical composition and the content of chemical bonds were quantified through X-ray photoelectron spectroscopy (XPS), and a decrease in C=C bonds and an increase in Fe-C bonds were confirmed.

Keywords

Acknowledgement

This work is supported by the project titled as Root technology development for global core industry quality - Root technology development project for global core industry quality (no. 20018618) funded by Korea Evaluation Institute of Industrial Technology of Ministry of Trade, Industry and Energy.

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