Super duplex stainless steel (UNS S32750) butt joints were prepared using ER2594 and ER2595 electrodes by shielded metal arc welding (SMAW) process. The heat input used during welding was in the range of 0.75–0.81 kJ/mm. Microstructure and texture across the weldments were investigated using optical microscope, scanning electron microscope, and electron backscattered diffraction. The solidification mode in the fusion zone (FZ) was found to be ferritic, and the microstructure mainly consisted of Widmanstatten austenite (WA), grain boundary austenite (GBA), and inter-granular austenite (IGA). The base metal (BM) had ~ 50% ferrite and 50% austenite. The ferrite proportion changed significantly in FZ and heat-affected zone (HAZ) after welding. Austenite in the BM showed strong Brass ({110} < 112 >), Cu ({112} < 111 >), Goss ({110} < 110 >), and S ({123} < 634 >) components, while ferrite showed strong α (RD// < 110 >) and γ (ND// < 111 >) fibres. The texture of ferrite was stronger than that of austenite. The austenite and ferrite in the FZ (cap pass) obeyed Kurdjumov–Sachs (K–S) orientation relationship. Further, the hardness of ER2595 weldments was found to be higher than that of ER2594 weldments.

超级双相不锈钢（UNS S32750）对接接头使用ER2594和ER2595焊条通过保护金属电弧焊（SMAW）工艺制备。焊接过程中使用的热输入范围为 0.75-0.81 kJ/mm。使用光学显微镜、扫描电子显微镜和电子背散射衍射研究了焊件的微观结构和织构。熔合区（FZ）的凝固方式为铁素体，显微组织主要由维德曼施塔登奥氏体（WA）、晶界奥氏体（GBA）和晶间奥氏体（IGA）组成。贱金属 (BM) 含有约 50% 的铁素体和 50% 的奥氏体。焊接后FZ和热影响区（HAZ）的铁素体比例发生了显着变化。BM 中的奥氏体显示出强黄铜 ({110} < 112 >)、铜 ({112} < 111 >)、高斯 ({110} < 110 >) 和 S ({123} < 634 >) 成分，而铁素体显示出强的 α (RD// < 110 >) 和 γ (ND// < 111 >) 纤维。铁素体的织构比奥氏体的织构要强。FZ (cap pass) 中的奥氏体和铁素体服从 Kurdjumov-Sachs (K-S) 取向关系。此外，发现 ER2595 焊件的硬度高于 ER2594 焊件的硬度。