Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Surface Roughness and Formation of Compound Layer in the Controlled Gaseous Nitriding Process on Cast Iron GC250D

GC250D의 가스분위기 제어질화 공정에서 화합물층의 형성에 따른 표면조도의 변화

  • Minjae Jeong (Customized Manufacturing R&D Department, Korea Institute of Industrial Technology) ;
  • Seokwon Son (Customized Manufacturing R&D Department, Korea Institute of Industrial Technology) ;
  • Jae-Lyoung Wi (SEHTec Co. Ltd) ;
  • Yong-Kook Lee (Department of Materials Science and Engineering, Yonsei University) ;
  • Won-Beom Lee (Customized Manufacturing R&D Department, Korea Institute of Industrial Technology)
  • 정민재 (한국생산기술연구원 뿌리기술연구소 친환경열표면처리연구부문) ;
  • 손석원 (한국생산기술연구원 뿌리기술연구소 친환경열표면처리연구부문) ;
  • 위재용 ((주)세텍) ;
  • 이영국 (연세대학교 신소재공학과) ;
  • 이원범 (한국생산기술연구원 뿌리기술연구소 친환경열표면처리연구부문)
  • Received : 2024.01.12
  • Accepted : 2024.02.19
  • Published : 2024.03.30
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Abstract

We investigated the changes in microstructure and surface roughness of the compound layer of GC250D gray cast iron, commonly used in brake discs, during gas nitriding. The gas atmosphere of the nitriding process was controlled with a hydrogen partial pressure of 49.5%, and the process was conducted at a nitriding temperature of 520℃ with various process times. As the nitriding process time of the GC250D material increased, both the depth of hardening and the thickness of the compound layer increased, with a maximum surface hardness of approximately 1265 HV0.1 was measured. Additionally, the surface roughness increased with the process time. Phase analysis of the compound layer revealed an increase in the proportion of the γ' phase as the nitriding process time increased. Changes in the formation of the compound layer were observed depending on the orientation of graphite within the material, leading to the formation of wedges. Therefore, the increase in surface roughness appears to be attributed to the uneven compounds, the expansion of the compound layer and wedges formed on the surface during the nitriding process.

Keywords

Acknowledgement

이 성과는 한국생산기술연구원의 지원(No. JH230003)을 받아 수행된 연구입니다.

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