Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effects of the Substitution of the Mo Element W of Super Duplex Stainless Steel Weld on the Secondary Phase Formation and Corrosion Resistance

슈퍼 듀플렉스 스테인리스강 용접부에서 Mo원소의 W치환이 2차상 석출과 부식 특성에 미치는 영향

  • Park, Hae-Ji (Department of Metallurgical Engineering, Dong-A University) ;
  • Lee, Hae-Woo (Department of Metallurgical Engineering, Dong-A University)
  • 박해지 (동아대학교 금속공학과) ;
  • 이해우 (동아대학교 금속공학과)
  • Received : 2013.03.12
  • Published : 2014.03.25
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Abstract

To investigate the effect of tungsten substitution of molybdenum on the formation of the second phase in Super Duplex Stainless Steel Weldments, welding wires with a composition of 3 wt% Mo, 2.2 wt% Mo-2.2 wt% W were designed for the flux cored arc welding process. As a result, the precipitation of the ${\chi}$ phase and ${\sigma}$ phase increased in proportion to the decrease in the amount of ${\delta}$ ferrite content because the reaction, ${\delta}$ ferrite ${\rightarrow}{\sigma}+{\gamma}2$, proceeded as the temperature rose. Under the same experimental conditions, the precipitation of the second phase, which degrades the properties of the material, was significantly reduced in the W substitution specimens compared to the Mo-only specimens. A polarization test conducted in a salt solution revealed that the pitting potential of the W substitution specimens was higher than that of the Mo-only specimens.

Keywords

Acknowledgement

Supported by : 한국연구재단

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