Abstract A wall component of super-duplex stainless steel was developed using cold metal transfer (CMT)-based wire + arc additive manufacturing (WAAM) technique with an ER2594 wire. The microstructure of the as-deposited wall was explored using optical microscopy and electron backscattered x-ray diffraction (EBSD) analysis. Ferrite count analysis indicated that the austenite-ferrite phase balance was altered along the as-deposited wall body. The average ferrite count near the as-deposited wall was 24.5%, compared with 32.3% in the root region. Widmanstatten and grain boundary austenite were formed near the wall boundary, and intragranular austenite was observed in the different layers. Secondary austenite in the transition layer was also observed. EBSD analysis revealed the sigma (σ) phase and austeno-ferritic phases across the WAAM wall. The tensile and yield strengths of the samples of the as-developed WAAM wall were almost identical regardless of orientations/tropism.

中文翻译：

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CMT 基焊丝加电弧增材制造 ER2594 的微观结构表征和拉伸性能

摘要 使用基于冷金属转移 (CMT) 的焊丝 + 电弧增材制造 (WAAM) 技术和 ER2594 焊丝开发了一种超级双相不锈钢壁组件。使用光学显微镜和电子背散射 x 射线衍射 (EBSD) 分析探索沉积壁的微观结构。铁素体计数分析表明，奥氏体-铁素体相平衡沿沉积态壁体发生了改变。沉积态壁附近的平均铁素体计数为 24.5%，而根部区域为 32.3%。壁界附近形成威德曼施塔滕和晶界奥氏体，在不同层间观察到晶内奥氏体。还观察到过渡层中的二次奥氏体。EBSD 分析揭示了 WAAM 壁上的西格玛 (σ) 相和奥氏体-铁素体相。