Effect of thermal aging on corrosion fatigue of Z3CN20.09M duplex stainless steel in high temperature water

The effects of 475 °C embrittlement on the corrosion fatigue (CF) in 290 °C water, mechanical and corrosion properties of Z3CN20.09 M duplex stainless steel (DSS) were investigated. The results indicated that the hardness and modulus of the ferrite in this steel increased while the impact energy and corrosion resistance decreased with increasing aging time. It is interested that these results were reversed when the aging time is up to 2000 h, suggesting that a self-healing behavior was occurred probably. The CF life of the specimens decreased with increasing aging time, which attributed to a combined effect of the deteriorated mechanical and corrosion properties subjected by the thermal aging.