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The Influence of Carbide Formation after Pack-chromizing Coating Including Hydrocarbon Gas

  • : Sang-Gweon Kim1, Jae-Hoon Lee1, Kuk-Hyun Yeo1
  • : 1KITECH
  • : PDF Download
  • : 2014

Abstract

A net-shaping sintered-steel has been composed of a chromium-rich coating on its surface via a pack-chromizing process a well-known anti-corrosion property improvement. It is used to substitute the sintered-stainless steel products of automobiles for pack-chromizing sintered-steel including carbide formation enhanced anti-corrosion and anti-wear properties. During the pack-chromizing by means of the thermo-chemical reactions, various gas species of chromium-halide from powder metal and gas diffusion on the sintered steel use activator and various chemical atmosphere conditions and temperature with an equilibrium state. Metal components of chromium and iron have been reacting with metal-halide gas and hydrocarbon gas during the pack-chromizing process. The coating layers markedly showed a shifted peak in the XRD diffraction pattern on the carbide position from (Cr,Fe)23C6 to (Cr,Fe)7C3 after the coating treatment, a changed environmental gas and a various activator concentration making higher hardness on the sintered-steel. The effect of pack-chromizing coating level during the process and various parameters such as time and temperature and various parameters on the growth of the diffusion layer on the surface of the high carbon steel has been studied by the competition of a pack-chromizing process with and without hydrocarbon gas atmosphere by virtue of the XRD and SEM analysis results.
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