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Effect of Carbides on the Pitting Corrosion of Mod. 440A Martensitic Stainless Steel

Mod. 440A 마르텐사이트계 스텐인리스강의 공식에 미치는 탄화물의 영향

  • Received : 2015.08.27
  • Accepted : 2015.10.21
  • Published : 2015.12.27

Abstract

In this study, we investigated the effect of the residual carbides and tempered carbides precipitated by tempering treatment after quenching on the pitting corrosion of mod. 440A martensitic stainless steel. In quenched specimens and tempered specimens after quenching of mod. 440A martensitic stainless steel, the volume fraction of the residual carbides and total carbides decreased with the increase of the austenitizing temperature. Pitting resistance increased with the increase of austenitizing temperature. With the increase of the volume fraction of the residual and total carbides, the pitting resistance of mod. 440A martensitic stainless steel was decreased. The pitting resistance of mod. 0.5C-17Cr-0.5Ni 440A martensitic stainless steel had stronger affected by residual carbides than precipitated carbides produced by tempering.

Keywords

pitting corrosion;martensitic stainless steel;carbide;quenching;tempering

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Acknowledgement

Supported by : Pukyong National University