The effect of solution annealing temperature ranging from 950 to 1200 °C on the microstructure and corrosion performance of duplex stainless steel (DSS) 2204 were investigated. The proportion of the ferrite phase increased while the austenite phase decreased and the ferrite stabilizing elements diluted in the ferrite phase with the increase of annealing temperature. The critical pitting temperature (CPT) of specimens annealed at 1000 °C was higher than those annealed at 950 °C, whereas further increasing the annealing temperature to 1200 °C decreased the CPT. The pitting initiation sites were observed in the austenite phase, at the boundary of ferrite/austenite phase and inside the ferrite phase for specimens annealed at 950, 1000 °C and exceeding 1100 °C, respectively. The evolution trend of the CPT and the pit initiation site were analyzed by the pitting resistance equivalent number.

中文翻译：

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固溶退火温度对双相不锈钢2204在氯化物溶液中点蚀行为的影响

研究了固溶退火温度950至1200°C对双相不锈钢（DSS）2204的组织和腐蚀性能的影响。随着退火温度的升高，铁素体相的比例增加而奥氏体相减少，铁素体稳定元素在铁素体相中的含量降低。在1000°C退火的样品的临界点蚀温度（CPT）高于在950°C退火的样品的点蚀温度，而将退火温度进一步提高到1200°C则降低了CPT。在分别于950、1000°C和超过1100°C退火的样品中，在奥氏体相，铁素体/奥氏体相的边界以及铁素体相内部观察到了点蚀起始点。