The effect of short time post-weld heat treatment on the fatigue crack growth of 2205 duplex stainless steel welds

Effect of solution annealing temperature on precipitation in 2205 duplex stainless steel

“…DSSs consist of approximately equal amount of austenite and ferrite [1,9], giving them superior strength and SCC resistance of ferritic stainless steels (FSSs) as well as good ductility and toughness of ASSs [10][11][12]. The ferrite/austenite phase balance is achieved by adjusting chromium (Cr), nickel (Ni) and nitrogen (N) contents and by control of the thermal history [1,13].…”

“…high temperatures) [14][15][16][17]. These intermetallic phases (chi-χ, sigma-σ and Laves) are usually rich in Cr, Mo and Ni resulting in their depletion from the adjoining matrix [18,19], leading to deterioration of mechanical properties [1,2,12] and/or corrosion resistance [14,16,19]. Further, the diffusion rates of the alloying elements in the ferrite are about 100 times faster than in the austenite [20][21][22][23].…”

Evaluation of Ferrite Quantification Methods Applied to Duplex Stainless Steels

“…Duplex stainless steel (DSS) is characterized ideally by equal amounts of ferrite and austenite in the microstructure, which provides increased mechanical resistance, due to the fine grain size, typical of these steels. It has higher corrosion resistance when compared to ferritic stainless steels, promoted by high content of chromium, nitrogen and molybdenum in their chemical composition, and due to the presence of austenite in its duplex structure presents good ductility and toughness, similar to austenitic stainless steels [2]. The excellent mechanical behavior and the high corrosion resistance are related to approximately 50% volume fraction of ferrite [3], and so the control of the ferrite content of the DSS is an important tool to ensure the desired properties.…”

Failure analysis on circulating water pump of duplex stainless steel in 1000MW ultra-supercritical thermal power unit

“…Actually, many researchers have focused on the properties of DSS, such as its fatigue behavior, welding property, corrosion resistance [10][11][12][13][14][15][16][17], but such an engineering practical study of mechanical degradation on DSS applied in CWP of 1000 MW ultra-supercritical thermal power unit has been rarely reported. What's more, the phenomenon that large numbers of fractures occurred on the flanges of the CWP is even less reported.…”