Abstract Pitting corrosion resistance of austenitic stainless steel welded zone is improved with an external magnetic field applied during laser-arc hybrid welding. Analysis of the microstructure indicates that welding with an external magnetic field homogenizes distribution of δ-ferrite in austenite matrix by weakening δ-ferrite texture intensity and promoting growth of uniform skeletal morphology. The improved pitting corrosion resistance is characterized by a higher pitting potential with smaller passivation current density, which is attributed to the uniform Cr diffusion resulting from homogeneous distribution of δ-ferrite.

中文翻译：

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激光-电弧复合焊接磁场对提高奥氏体不锈钢焊区抗点蚀性能的影响

摘要 在激光-电弧复合焊接过程中，外加磁场可以提高奥氏体不锈钢焊接区的耐点蚀性能。显微组织分析表明，外部磁场焊接通过减弱δ-铁素体织构强度和促进均匀骨架形貌的生长，使奥氏体基体中δ-铁素体的分布均匀。改进的耐点蚀性能的特点是更高的点蚀电位和更小的钝化电流密度，这归因于δ-铁素体的均匀分布导致均匀的Cr扩散。