Abstract The effects of electron beam welding and subsequent post-weld heat treatment at different temperatures on the microstructure evolution and pitting corrosion resistance of duplex stainless steel were investigated. The as-welded joint exhibited poor pitting corrosion resistance, and pitting preferentially occurred at the ferrite grain in the weld. Heat treatment promoted austenite formation, Cr2N dissolution, and eliminated dendritic segregation, consequently improving the corrosion resistance of the welded joint. The optimal solution temperature range was 1050–1110 °C. The austenite in the weld was prone to selective corrosion after heat treatment owing to its lower pitting resistance equivalent number.

中文翻译：

---

焊后热处理对电子束焊接双相不锈钢组织演变及耐点蚀性能的影响

摘要 研究了电子束焊接及后续不同温度的焊后热处理对双相不锈钢组织演变和耐点蚀性能的影响。焊态接头的耐点蚀性能较差，点蚀优先发生在焊缝中的铁素体晶粒处。热处理促进了奥氏体的形成、Cr2N 的溶解，消除了枝晶偏析，从而提高了焊接接头的耐腐蚀性能。最佳溶液温度范围为 1050–1110 °C。焊缝中的奥氏体由于其较低的抗点蚀当量数，在热处理后容易发生选择性腐蚀。