Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
권호 표지

Characteristics of Hardness and Wear-Resistance of Plasma-Nitrided and Nitrocarburized Carbon Steels

플라즈마질화 및 침질탄화처리한 탄소강의 경도와 내마모특성

  • Kim, M.K. (Dept. of Metall. Eng., Pukyong National University) ;
  • Jung, B.H. (Dept. of Metall. Eng., Pukyong National University) ;
  • Park, H.S. (Dept. of Mat. Eng., Pukyong National University) ;
  • Lee, B.C. (Dept. of Metall. Eng., Pukyong National University) ;
  • Shin, S.H. (Dept. of Metall. Eng., Graduate School, Pukyong National University) ;
  • Lee, J.S. (Dept. of Met. and Mat. Eng., University of Ulsan)
  • 김무길 (부경대학교 금속공학과) ;
  • 정병호 (부경대학교 금속공학과) ;
  • 박화순 (부경대학교 재료공학과) ;
  • 이병찬 (부경대학교 금속공학과) ;
  • 신성하 (부경대학교 금속공학과 대학원) ;
  • 이재식 (울산대학교 재료.금속공학부)
  • Published : 1999.06.30
Download PDF
⟨ Previous Next ⟩

Abstract

Commercial carbon steels containing 0.2~0.55 wt.----C were plasma-nitrided or plasma nitrocarburized at $550^{\circ}C$ for 21.6Ks using $H_2-N_2$ or $H_2-N_2$-CO mixed gas respectively. The characteristics of hardening and wear-resistance of each treatment were studied and compared. And also microstructure of nitrided layer and nitrides formed in compound layer near surface were studied. All plasma-nitrided steels investigated showed remarkable increase of surface hardness with the increase of carbon content. But nitrocarburized steels resulted in higher surface-hardness than plasma-nitrided steels, which means that nitrocarburized has higher surface-hardening effect. Plasma-nitrided steels showed hardness increase in through-thickness direction near surface. And also nitrocarburized steels showed similar hardness distribution in through-thickness direction to that of plasma-nitrided steel. However, nitrocarburized steels had higher cross-sectional maximum-hardness than plasma-nitrided steels as much as 100Hv. Wear test showed that the amount of specific wear was reduced by both plasma-nitriding and nitrocarburized, showing that the amount of specific wear was not related to the hardness. But non-treated specimen showed that the amount of specific wear was related to the hardness.

Keywords