Microstructural evolution and pitting corrosion behavior of friction stir welded joint of high nitrogen stainless steel
Microstructural evolution and pitting corrosion behavior of friction stir welded joint of high nitrogen stainless steel
复制标题
高氮不锈钢搅拌摩擦焊接头组织演变及点蚀行为
DOI：
10.1016/j.matdes.2016.08.048
复制
发表时间：
2016-11
影响因子：
8.4
通讯作者：
Ma Z. Y.
中科院分区：
文献类型：
--
作者：
Zhang H.;Wang D.;Xue P.;Wu L. H.;Ni D. R.;Ma Z. Y.
高氮不锈钢搅拌摩擦焊接头的形成过程中，接头各区域的显微组织发生了显著的变化。这将引起接头腐蚀性能的变化。采用电化学和浸泡试验研究了高氮不锈钢搅拌摩擦焊接头的腐蚀行为。在热影响区，击穿电位没有明显下降，点蚀的数量和尺寸分布密度与母材相似。焊核区具有较好的抗点蚀性能，这主要是由于焊接过程中粗大夹杂物的破碎和晶粒细化所致。由于Cr没有扩散，δ铁素体带和刀具磨损对焊接接头的腐蚀行为没有明显影响。
With the achievement of sound joints of high nitrogen stainless steel via friction stir welding, significant microstructural changes take place in various regions of the joints. This would bring out the change in the corrosion properties of the joints. In this study, the corrosion behavior of friction stir welded joint of high nitrogen stainless steel was investigated using electrochemical and immersion tests. No drastic decrease in breakdown potentials was observed in the heat affected zones with number and size distribution densities of pits being similar to that in the base metal. The nugget zone exhibited a relatively good pitting corrosion resistance, mainly attributing to the breakup of coarse inclusions and grain refinement during welding. The δ-ferrite bands and tool wear exerted no obvious effects on the corrosion behavior of the welded joint due to the lack of Cr diffusion.
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