Pitting Corrosion Resistance of Nitrogen-Added Type 304 Stainless Steel Weld Metal with Different Heat Inputs
Pitting Corrosion Resistance of Nitrogen-Added Type 304 Stainless Steel Weld Metal with Different Heat Inputs
复制标题
不同热输入下加氮型304不锈钢焊缝金属的耐点蚀性能
DOI：
10.5006/1.3585132
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
J. B. Gnanamoorthy
中科院分区：
文献类型：
--
作者：
U. Mudali;R. Dayal;T. Gill;J. B. Gnanamoorthy
摘要研究了热输入对含氮量不同的304不锈钢（UNS S30400）焊缝抗点蚀性能和显微组织的影响。结果表明，随着热输入的增加，耐点蚀性能略有下降，热输入的这种不利影响被氮含量的增加所抵消。点蚀攻击被发现发生在奥氏体/δ铁素体界面和奥氏体相界。随着热输入的增加，焊缝金属中的氮含量降低。铁素体数（FN）的边际增加，观察到的热输入增加，由于氮水平的降低。
Abstract The influence of heat input on the pitting corrosion resistance and microstructural changes of type 304 (UNS S30400) stainless steel (SS) weld metals containing different amounts of nitrogen was evaluated. The results indicated that the pitting corrosion resistance decreased slightly as the heat input was increased and this deleterious effect of heat input was offset by the increase in the nitrogen level. Pitting attack was found to occur at the austenite/delta ferrite interfaces and at the austenite phase boundaries. As the heat input was increased the nitrogen content in the weld metal decreased. A marginal increase in the ferrite number (FN) was observed as the heat input was increased, owing to the reduction in nitrogen level.