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http://dx.doi.org/10.1016/j.net.2021.02.001

Effect of thermal aging on the mechanical, intergranular corrosion and corrosion fatigue properties of Z3CN20.09M cast duplex stainless steel  

Ti, Wenxin (Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing)
Wu, Huanchun (Plant Life Management Center, Suzhou Nuclear Power Research Institute)
Xue, Fei (Plant Life Management Center, Suzhou Nuclear Power Research Institute)
Zhang, Guodong (Plant Life Management Center, Suzhou Nuclear Power Research Institute)
Peng, Qunjia (Plant Life Management Center, Suzhou Nuclear Power Research Institute)
Fang, Kewei (Plant Life Management Center, Suzhou Nuclear Power Research Institute)
Wang, Xitao (Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing)
Publication Information
Nuclear Engineering and Technology / v.53, no.8, 2021 , pp. 2591-2599 More about this Journal
Abstract
The effect of thermal aging at 475 ℃ and 750 ℃ of Z3CN20.09M cast duplex stainless steel (CDSS) on microstructure, mechanical and intergranular corrosion properties were investigated by transmission electron microscope (TEM), nano indenter, scanning electron microscope (SEM) and corrosion fatigue test system. The result indicated that the spinodal decomposition and G precipitated were occurred after aged at 475 ℃, as well as sigma precipitated at 750 ℃. The microstructure degeneration of ferrite was saturated after aged for 2000h and 200 h at 475 ℃ and 750 ℃ respectively. The mechanical properties, intergranular corrosion resistance and corrosion fatigue lives were continuing deteriorated with increasing the aging time at both temperatures. The difference of the degeneration mechanisms of Z3CN20.09M CDSS aged at 475 ℃ and 750 ℃ was analyzed.
Keywords
Thermal aging; Spinodal decomposition; Sigma precipitation; Corrosion fatigue; High temperature water;
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