Effect of Carbon Content on the Nitrogen Permeation Heat Treatment in Aluminum Bearing 13%Cr Stainless Steels

Al 함유 13%Cr 스테인리스강의 표면 질소침투 열처리에 미치는 첨가원소 탄소의 영향 (13%Cr 스테인리스강의 고질소 표면침투 열처리)

  • Yoo, D.K. (Department of Metallurgical Engineering, Dong-A University) ;
  • Park, J.U. (Department of Metallurgical Engineering, Dong-A University) ;
  • Joo, D.W. (Department of Metallurgical Engineering, Dong-A University) ;
  • Kim, K.D. (POSCO Technical Research Laboratories) ;
  • Sung, J.H. (Department of Metallurgical Engineering, Dong-A University)
  • 유대경 (동아대학교 금속공학과) ;
  • 박진욱 (동아대학교 금속공학과) ;
  • 주동원 (동아대학교 금속공학과) ;
  • 김기돈 (포항종합제철(주) 기술연구소) ;
  • 성장현 (동아대학교 금속공학과)
  • Received : 2000.02.09
  • Published : 2000.05.30

Abstract

This study aims to investigate the effect of carbon content on the surface nitrogen permeation of 13%Cr-1.8%Al alloyed stainless steels. The surface nitrogen permeation was performed at $1050^{\circ}C{\sim}1200^{\circ}C$ in the $1kg/cm^2$ nitrogen gas atmosphere. The nitrogen permeated surface layer of the specimen containing 0.03%C consists of AlN, martensite and retained austenite phases. while the surface layer of the specimen containing 0.14%C appears the $AlFe_3C_x$ phase including former three phases. The specimen containing 0.14%C shows lower total case depth than that containing 0.03%C at the nitrogen permeation temperatures of $1050^{\circ}C$ and $1100^{\circ}C$, while the total case depth of the specimen containing 0.14%C is remarkably increased at the temperature of $1150^{\circ}C$ and $1200^{\circ}C$ due to the increase in the retained austenite content. Martensitic phase, AlN and $AlFe_3C_x$ precipitate of the nitrogen permeated surface layer cause to increase the surface hardness of 550~600Hv.

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Acknowledgement

Supported by : 동아대학교