Effect of Annealing Temperature on the Pitting Corrosion Behavior of UNS S82441 Duplex Stainless Steel
Effect of Annealing Temperature on the Pitting Corrosion Behavior of UNS S82441 Duplex Stainless Steel
复制标题
退火温度对UNS S82441双相不锈钢点蚀行为的影响
作者：
Yang, Y.;Tan, H.;Li, J.
用恒电位临界点蚀温度法研究了UNS S82441双相不锈钢在1000℃~1130℃6种不同温度下1h的点蚀行为。用光学/扫描电子显微镜研究了试件的组织演变和凹坑形貌。结果表明，奥氏体相的体积分数随退火温度的升高而降低。在较高温度下退火后，可获得较低的临界点蚀温度值。点蚀优先发生在铁素体内部，表明铁素体相比奥氏体相具有更好的抗点蚀性能。随退火温度的升高，铁素体相的点蚀电阻当量数下降，而奥氏体相的点蚀电阻当量数增加。在该钢退火温度范围内，未发现铁素体和奥氏体相的等值抗点蚀性能。
The pitting corrosion behavior of UNS S82441 duplex stainless steel annealed at six different temperatures ranging from 1,000 degrees C to 1,130 degrees C for 1 h has been investigated by means of the potentiostatic critical pitting temperature. The microstructure evolution and pit morphologies of the specimens were studied using optical/scanning electron microscopy. The results demonstrated that the volume fraction of the austenite phase decreased with the increasing annealing temperature. Lower critical pitting temperature values were obtained after annealing at higher temperatures. Pitting was initiated preferentially inside the ferrite domains, indicating that the ferrite phase had inferior pitting corrosion resistance as compared to the austenite phase. The pitting resistance equivalent number of the ferrite phase fell with the annealing temperature, while the values for the austenite phase rose. No equal pitting resistance equivalent number of the ferrite and austenite phases was found for this steel in the range of annealing temperatures.