Corrosion performance of a multi-layered ER316LSi wall deposited using wire and arc additive manufacturing was studied in the as-deposited condition and after stress relief heat treatment at 900 °C, in 3.5 wt% NaCl solution. It was found that the heat treatment is not suitable for WAAM ER316LSi components due to the complete transformation of the delta ferrite into sigma decreasing the corrosion performance. The delta ferrite to sigma transformation during heat treatment was facilitated by the cyclic reheating of the part during deposition. The electrochemical response of as-deposited WAAM differed from a wrought alloy with similar composition and linked to microstructural differences: as-deposited WAAM had a higher pitting potential due to the absence of sulfide inclusions and increased metastable-like activity due to the presence of the secondary delta ferrite causing elemental segregation.

在沉积状态和 900 °C 应力消除热处理后，在 3.5 wt% NaCl 溶液中研究了使用线材和电弧增材制造沉积的多层 ER316LSi 壁的腐蚀性能。发现热处理不适用于 WAAM ER316LSi 组件，因为 δ 铁素体完全转变为 sigma 降低了腐蚀性能。沉积过程中零件的循环再加热促进了热处理过程中 δ 铁素体向 sigma 的转变。沉积态 WAAM 的电化学响应不同于具有相似成分的锻造合金，并与微观结构差异相关：