Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Formation of compound layers and Wear behavior of AISI4115 steels by gaseous nitriding process

AISI4115 기계구조용 합금강의 질화 가스분위기에 따른 화합물층의 형성 및 내마모특성

  • Kim, Taehwan (Eco-Friendly Thermal Surface Treatment R&D Group, Korea Institute of Industrial Technology(KITECH)) ;
  • Son, Seokwon (Eco-Friendly Thermal Surface Treatment R&D Group, Korea Institute of Industrial Technology(KITECH)) ;
  • Cho, Kyuntaek (Power materials R&D Group, Korea Institute of Industrial Technology(KITECH)) ;
  • Lee, Kee-ahn (Department of Materials Science and Engineering, Inha University) ;
  • Lee, Won-beom (Eco-Friendly Thermal Surface Treatment R&D Group, Korea Institute of Industrial Technology(KITECH))
  • 김태환 (한국생산기술연구원 뿌리기술연구소 친환경표면처리연구부문) ;
  • 손석원 (한국생산기술연구원 뿌리기술연구소 친환경표면처리연구부문) ;
  • 조균택 (한국생산기술연구원 서남본부 동력소재부품연구그룹) ;
  • 이기안 (인하대학교 신소재공학과) ;
  • 이원범 (한국생산기술연구원 뿌리기술연구소 친환경표면처리연구부문)
  • Received : 2021.10.08
  • Accepted : 2021.10.26
  • Published : 2021.10.31
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Abstract

Nitriding layers developed during gaseous nitriding of AISI4115 steels for the application of steel bushing part were investigated. The compound layer thickness of about 10㎛, 0.3mm of case depth under the same conditions, and conventional nitriding, nitrocarburizing, and controlled nitriding were performed in three methods. In the controlled nitriding, KN was controlled by measuring the hydrogen partial pressure. The nitrided samples were analyzed by micro Vickers hardness test, optical microscopy and scanning electron microscopy. The phases of compound layer were identified by X-ray diffraction and electron backscatter diffraction. The controlled nitriding specimen indicated the highest surface hardness of about 860 HV0.1. The compound layer of the conventional nitriding and nitrocarburizing specimen was formed with about 46% porous layer and 𝜺 + 𝜸' phase, and about 13% porous layer and about 80% 𝜸' phase were formed on the controlled nitriding specimen. As a result of the Ball-on-disk wear test, the worn mass loss of ball performed on the surface of the controlled nitriding specimen was the largest. The controlled nitriding specimen had the highest surface hardness due to the lowest porous percentage of compound layer, which improved the wear resistance.

Keywords

References

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