Effect of Solidification Mode and Impurities on Pitting Corrosion in AISI 316 GTA Welds
Effect of Solidification Mode and Impurities on Pitting Corrosion in AISI 316 GTA Welds
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凝固模式和杂质对 AISI 316 GTA 焊缝点蚀的影响
DOI：
10.5006/1.3581919
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
L. P. Karjalainen
中科院分区：
文献类型：
--
作者：
A. Grekula;V. Kujanpaa;L. P. Karjalainen
摘要 通过标准氯化铁浸泡试验和酸性氯化物溶液中的动电位阳极极化试验，对 AISI 316 钢板的约 30 个商业和实验室炉次的自生 GTA 焊缝的抗点蚀性能进行了评估。结果表明，凝固模式虽然影响偏析强度，但对此类焊缝的抗点蚀能力仅具有次要影响。初生奥氏体焊缝中最后凝固的枝晶间区域和初生铁素体焊缝中的δ铁素体/奥氏体相界面是最容易产生凹坑的部位。增加硫含量会降低三氯化铁浸泡试验中的点蚀电位，增加点蚀密度，但对点蚀生长速率没有影响。还讨论了降低磷或锰含量的影响。
Abstract Pitting resistance was evaluated in autogenous GTA welds of approximately 30 commercial and laboratory heats of AISI 316 steel sheets by the standard ferric chloride immersion test and the potentiodynamic anodic polarization test in acid chloride solution. The results indicate that the solidification mode, although it affects the segregation intensity, has only a secondary influence on pitting resistance in this type of weld. The last interdendritic regions to solidify in primary austenitic welds and the delta ferrite/austenite phase interfaces in primary ferritic welds are the most susceptible sites for pit initiation. Increasing the sulfur content will reduce the pitting potential and increase the pit density in the ferric chloride immersion test, but it has no effect on pit growth rate. The effects of reducing the phosphorus or manganese content are also discussed.