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Fatigue Crack Initiation in 2205 Duplex Stainless Steel under SelectiveDissolution Condition

机译:选择性溶解条件下2205双相不锈钢的疲劳裂纹萌生

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The effect of selective dissolution on fatigue crack initiation of 2205 duplex stainless steel(DSS) was investigated in this study. In mixed sulfuric and hydrochloric acid aqueous solution, thereexisted two distinctly separated anodic peaks in the active-to-passive transition region of the polarizationcurve. Either ferritic or austenitic phase was selectively dissolved at each characteristic anodic peakpotential. Under sinusoidal cyclic loading condition, however, selective dissolution did not assist fatiguecrack initiation instead resulting in the elimination of stress concentration site in the selectively dissolvingphase. As a consequence, under selective dissolution condition, fatigue crack initiated in the phase whileits dissolution rate was lower with respect to the other constituent phase in the duplex stainless steel. Themicrostructural evolution of the corrosion fatigue crack initiation in 2205 DSS in the mixed sulfuric andhydrochloric acid solution is highlighted in this investigation.
机译:研究了选择性溶解对2205双相不锈钢(DSS)疲劳裂纹萌生的影响。在硫酸和盐酸混合水溶液中,在极化曲线的主动-被动过渡区域中存在两个明显分开的阳极峰。铁素体相或奥氏体相被选择性地溶解在每个特征阳极峰电位处。然而,在正弦循环加载条件下,选择性溶解并不能帮助疲劳裂纹的产生,反而导致了在选择性溶解阶段应力集中的消除。结果,在选择性溶解条件下,在双相不锈钢中,在该相中产生了疲劳裂纹,而其溶解速率相对于其他组成相而言较低。这项研究突出了在2205 DSS中混合硫酸和盐酸溶液中腐蚀疲劳裂纹萌生的微观结构演变。

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