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首页> 外文期刊>Metals >Atmospheric-Induced Stress Corrosion Cracking of Grade 2205 Duplex Stainless Steel—Effects of 475 °C Embrittlement and Process Orientation
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Atmospheric-Induced Stress Corrosion Cracking of Grade 2205 Duplex Stainless Steel—Effects of 475 °C Embrittlement and Process Orientation

机译：2205级双相不锈钢的大气诱导应力腐蚀开裂— 475°C脆化和工艺取向的影响

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摘要

The effect of 475 °C embrittlement and microstructure process orientation on atmospheric-induced stress corrosion cracking (AISCC) of grade 2205 duplex stainless steel has been investigated. AISCC tests were carried out under salt-laden, chloride-containing deposits, on U-bend samples manufactured in rolling (RD) and transverse directions (TD). The occurrence of selective corrosion and stress corrosion cracking was observed, with samples in TD displaying higher propensity towards AISCC. Strains and tensile stresses were observed in both ferrite and austenite, with similar magnitudes in TD, whereas, larger strains and stresses in austenite in RD. The occurrence of 475 °C embrittlement was related to microstructural changes in the ferrite. Exposure to 475 °C heat treatment for 5 to 10 h resulted in better AISCC resistance, with spinodal decomposition believed to enhance the corrosion properties of the ferrite. The austenite was more susceptible to ageing treatments up to 50 h, with the ferrite becoming more susceptible with ageing in excess of 50 h. Increased susceptibility of the ferrite may be related to the formation of additional precipitates, such as R-phase. The implications of heat treatment at 475 °C and the effect of process orientation are discussed in light of microstructure development and propensity to AISCC.
机译：研究了475°C脆化和微观结构工艺取向对2205级双相不锈钢的大气诱导应力腐蚀开裂（AISCC）的影响。 AISCC测试是在含盐，含氯化物的沉积物上，以滚动（RD）和横向（TD）制造的U形弯曲样品上进行的。观察到选择性腐蚀和应力腐蚀开裂的发生，TD中的样品显示出更高的对AISCC的倾向。在铁素体和奥氏体中都观察到应变和拉应力，TD的大小相似，而在RD中，奥氏体的应变和应力更大。 475°C脆化的发生与铁素体的显微组织变化有关。暴露于475°C的热处理5至10 h可获得更好的AISCC抗性，旋节线分解可增强铁素体的腐蚀性能。奥氏体更容易受到长达50小时的时效处理的影响，而铁素体变得更容易受到超过50小时的时效的影响。铁氧体磁化率的提高可能与其他沉淀物（如R相）的形成有关。鉴于微观结构的发展和对AISCC的倾向性，讨论了在475°C热处理的意义和工艺取向的影响。

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