Nitride Precipitation during Isothermal Heating after Rapidly Cooled from High Temperature in Duplex Stainless Steel

Nitride precipitation during isothermal heating after rapidly cooled from the ferrite phase enriched temperature in duplex stainless steel was investigated to clarify the effect of nitrogen in steel as an alloying element and austenite phase growth. Nitride precipitation is frequently harmful for the properties such as toughness or corrosion resistance in duplex stainless steels. The heat affected zone (HAZ) in the vicinity of fusion boundary in weldments tends to have more remarkable nitride precipitation because of rapid cooling from the ferrite phase enriched temperature. During cooling process the growth of austenite phase occur resulting in the prevention of nitride precipitation.