Pitting behavior of welded joint and the role of carbon ring in improving corrosion resistance
Pitting behavior of welded joint and the role of carbon ring in improving corrosion resistance
复制标题
焊接接头的点蚀行为及碳环提高耐腐蚀性能的作用
DOI：
10.1016/j.matdes.2019.108120
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发表时间：
2019-12
影响因子：
8.4
通讯作者：
Lu Fenggui
中科院分区：
文献类型：
--
作者：
Chu Tongjiao;Nuli Yanna;Cui Haichao;Lu Fenggui
[en] Highlights:• Carbon rings surrounding pit in heat-affected zone protected matrix from serious dissolution and inhibited pit growth.• Strain aging facilitated carbon diffusion, and selective corrosion further drove the formation of carbon ring in heat-affected zone.• Strong strain concentration caused the higher sensitivity to pitting for weld metal.• Competition mechanism induced serious pitting in chloride solution and obvious cracking in pure water for weld metal.--Abstract: Pitting behavior and its transition process to cracking were investigated after immersion at 180 C in pure water and 3.5% NaCl solution for NiCrMoV welded joint manufactured by narrow gap submerged arc welding technology. Dislocation outcrops in the interior of the grains formed small anodes, which mainly attributed to the pit growth for weld metal (WM) and heat-affected zone (HAZ). The serious pitting in WM was induced by strong strain concentration generating from welding thermal stress. Competition behavior between pitting and cracking for WM in pure water and chloride solution was also proposed. Chloride accelerating anodic dissolution caused serious pitting that predominated over cracking in chloride solution, while cracking preferentially formed and replaced mild pitting in pure water. In addition, carbon rings around pits decreased pitting susceptibility for HAZ. The formation of carbon rings generated from carbon diffusion was driven by strain aging and selective corrosion. Moreover, micro-Raman manifested the carbon ring was covered by protective oxide layer that inhibited pit growth and improved pitting resistance for HAZ. This work contributes to the understanding of pit growth and crack initiation for welded joint used in nuclear turbine.
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影响因子：
6.2
作者：
Liu Peng;F. Lu;Xia Liu;Hui-jun Ji;Yulai Gao
通讯作者：
Liu Peng;F. Lu;Xia Liu;Hui-jun Ji;Yulai Gao
高氮不锈钢搅拌摩擦焊接头组织演变及点蚀行为
影响因子：
8.4
作者：
Zhang H.;Wang D.;Xue P.;Wu L. H.;Ni D. R.;Ma Z. Y.
通讯作者：
Ma Z. Y.
影响因子：
8.4
作者：
V. Vignal;V. Richoux;Eric Suzon-;S. Thiébaut;K. Tabaleiv
通讯作者：
V. Vignal;V. Richoux;Eric Suzon-;S. Thiébaut;K. Tabaleiv
低压核汽轮机模拟环境加载方式对CrNiMoV钢焊接接头断裂行为的影响
影响因子：
5.4
作者：
Huang, Yuhui;Ouyang, Yuqing;Xuan, Fu-zhen
通讯作者：
Xuan, Fu-zhen
影响因子：
3
作者：
J.Z Zhao;A. De;B. De Cooman
通讯作者：
J.Z Zhao;A. De;B. De Cooman