Fused filament fabrication (FFF) is one of the additive manufacturing processes which has gained more interest because of its simplicity and low-cost. This technology is similar to the conventional metal injection moulding (MIM) process, consisting of the feedstock preparation of metal powder and polymer binders, followed by layer-by-layer 3D printing (FFF) or injection (MIM) to create green parts and, finally, debinding and sintering. Moreover, both technologies provide near-dense parts. This work presents an in-depth study of the processing method’s influence. The porosity, microstructure, hardness, corrosion, and tribocorrosion behaviour are compared for 17-4 PH SS samples processed from powder by additive manufacturing using FFF and MIM, as well as conventional powder metallurgy (PM) samples. MIM samples exhibited the highest macro and microhardness, while corrosion behaviour was similar for both MIM and FFF samples, but superior in comparison to conventional PM samples. However, the FFF-as fabricated samples displayed a significant improvement in tribocorrosion resistance that could be explained by the higher proportion of delta ferrite and retained austenite in their microstructure.

熔丝制造（FFF）是增材制造工艺之一，因其简单和低成本而受到越来越多的关注。该技术类似于传统的金属注射成型（MIM）工艺，包括金属粉末和聚合物粘合剂的原料制备，然后通过逐层3D打印（FFF）或注射（MIM）来制造绿色零件，最后进行脱脂、烧结。此外，这两种技术都提供近乎致密的部件。这项工作对加工方法的影响进行了深入研究。对使用 FFF 和 MIM 通过增材制造粉末加工而成的 17-4 PH SS 样品以及传统粉末冶金 (PM) 样品的孔隙率、微观结构、硬度、腐蚀和摩擦腐蚀行为进行了比较。 MIM 样品表现出最高的宏观和显微硬度，而 MIM 和 FFF 样品的腐蚀行为相似，但优于传统 PM 样品。然而，FFF 制造的样品在耐摩擦腐蚀性方面表现出显着改善，这可以通过其微观结构中更高比例的 δ 铁素体和残余奥氏体来解释。