双相不锈钢在水溶液中之腐蚀疲劳与动态应变时效

电化学（中英文） ›› 2003, Vol. 9 ›› Issue (3): 265-271.

双相不锈钢在水溶液中之腐蚀疲劳与动态应变时效

曾传铭,罗亦旋,蔡文达

成功大学材料科学及工程系,成功大学材料科学及工程系,成功大学材料科学及工程系台湾台南70101 ,台湾台南70101 ,台湾台南70101

收稿日期:2003-08-28 修回日期:2003-08-28 出版日期:2003-08-28 发布日期:2003-08-28

Corrosion Fatigue and Dynamic Strain Aging of Duplex Stainless Steel in Aqueous solution

Chuan_Ming Tseng, I_Hsuang Lo, Wen_Ta Tsai *

( Department of Materials Science and Engineering,National Cheng Kung University, Tainan 70101,China

Received:2003-08-28 Revised:2003-08-28 Published:2003-08-28 Online:2003-08-28

摘要/Abstract

摘要： 本研究主要探讨 2 2 %Cr双相不锈钢在含氯离子水溶液中之腐蚀疲劳裂缝成长行为 ,以及在慢应变速率拉伸试验过程中所发生的动态应变时效现象 .同时以 31 6L沃斯田体系不锈钢及4 30肥粒体系不锈钢作为比较 ,藉以探讨不同晶体结构对腐蚀疲劳及动态应变时效行为的影响 .实验结果显示 ,在 80℃ ,3.5wt%NaCl水溶液中 ,3种不锈钢并未发生应力腐蚀破裂 ,但其中 31 6L沃斯田体系不锈钢及 2 2 %Cr双相不锈钢却发生动态应变时效 ,且动态应变时效的发生与温度 ,应变速率及沃斯田体相的组织有关 .在NaCl水溶液中 ,采用预裂试片量测疲劳裂缝生长速率 ,其结果表明 ,4 30肥粒体系不锈钢之疲劳裂缝生长速率最快 ,而氢脆是加快裂缝生长速率的主因 ,就双相不锈钢而言 ,腐蚀疲劳裂缝的生长主要与该不锈钢所含之肥粒体相的氢脆现象有关

关键词: 双相不锈钢, 腐蚀疲劳破裂, 动态应变时效, 应力腐蚀破裂, 氢脆

Abstract: The corrosion fatigue and dynamic strain aging behaviors of 22%Cr duplex stainless steel (DSS) in sodium chloride solutions were investigated. Austenitic 316L SS and ferrtic 430 SS were also used in this study for a comparison. The experimental results showed that no stress corrosion cracking (SCC) occurred in all these SSs tested in 3.5wt% NaCl solution at 80 ℃. However, dynamic strain aging (DSA) occurred in 316L austenitic SS and 22%Cr DSS during slow strain rate testing (SSRT) in this solution.The occurrence of DSA was dependent on solution temperature,strain rate and the presence of austenitic phase. The corrosion rate of fatigue crack growth (FCG) in 3.5wt% NaCl solution was found to be the highest for 430 ferritic SS.The high FCG rate in 430 SS was associated with brittle failure caused by hydrogen embrittlement.For 22%Cr DSS,accelerated FCG in NaCl solution was attributed to hydrogen embrittlement of the constituent ferrite phase.

Key words: Duplex stainless steel, Corrosion fatigue, Dynamic strain aging, Stress corrosion cracking, Hydrogen embrittlement

中图分类号:

TG171

曾传铭,罗亦旋,蔡文达. 双相不锈钢在水溶液中之腐蚀疲劳与动态应变时效[J]. 电化学（中英文）, 2003, 9(3): 265-271.

Chuan_Ming Tseng, I_Hsuang Lo, Wen_Ta Tsai * . Corrosion Fatigue and Dynamic Strain Aging of Duplex Stainless Steel in Aqueous solution[J]. Journal of Electrochemistry, 2003, 9(3): 265-271.

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