Journal of Surface Science and Engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Surface Hardening and Wear Properties of AISI 410 Martensitic Stainless Steel by High & Low Temperature Gaseous Nitriding

고온 가스 질화와 저온 가스 질화 방법에 따른 AISI 410 마르텐사이트 스테인레스강의 경화층 및 마모 특성

  • Son, Seok-Won (Heat Treatment R&D Group, Korea Institute of Industrial Technology (KITECH)) ;
  • Lee, Won-Beom (Heat Treatment R&D Group, Korea Institute of Industrial Technology (KITECH))
  • 손석원 (한국생산기술연구원 뿌리산업기술연구소 열처리그룹) ;
  • 이원범 (한국생산기술연구원 뿌리산업기술연구소 열처리그룹)
  • Received : 2018.06.04
  • Accepted : 2018.07.20
  • Published : 2018.08.31
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Abstract

High temperature and low temperature gaseous nitriding was performed in order to study of the surface hardening and wear properties of the nitrided AISI 410 Martensitic stainless steels. High temperature gaseous nitiridng (HTGN) was carried out using partial pressure $N_2$ gas at $1,100^{\circ}C$ for 10 hour, and Low temperature gaseous nitiridng (LTGN) was conducted in a gas mixture of NH3 and N2 at $470^{\circ}C$ for 10 hour. The nitrided samples were characterized by microhardness measurements, optical microscopy and scanning electron microscopy. The phases were identified by X-ray diffraction and nitrogen concentration was analyzed by GD-OES. The HTGN specimen had a surface hardness of about $700HV_{0.1}$, $350{\mu}m$ of case depth. A ${\sim}50{\mu}m$ thick, $1,250HV_{0.1}$ hard nitrided case formed at the surface of the AISI 410 steel by LTGN, composed nitrogen supersaturated expanded martensite and ${\varepsilon}-Fe_{24}N_{10}$ iron nitrides. Additionally, the results of the wear tests, carried out LTGN specimen was low friction coefficient and high worn mass loss of ball. The increase in wear resistance can be mainly attributed to the increase in hardness and to the lattice distortion caused by higher nitrogen concentration.

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