| Title |
Effects of the Substitution of the Mo Element W of Super Duplex Stainless Steel Weld on the Secondary Phase Formation and Corrosion Resistance |
| Authors |
박해지(Hae Ji Park); 이해우(Hae Woo Lee) |
| DOI |
https://doi.org/10.3365/KJMM.2014.52.3.211 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
metals; welding; precipitation; electron backscattering diffraction(EBSD); super duplex stainless steel |
| 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 χ phase and σ phase increased in proportion to the decrease in the amount of δ ferrite content because the reaction, δ ferrite → σ + γ2, 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. |