Integrating oxide nanoparticles (ONPs) into additively manufactured oxide dispersion‐strengthened (ODS) steels is challenging due to their tendency for agglomeration and particle loss during processing. This study compares chemically synthesized and laser‐generated ZrO₂ ONPs in Fe20Cr alloys produced by laser‐based powder bed fusion (PBF‐LB/M) using two concentrations (0.1 and 1.0 vol%) under comparable conditions. Oxide nanoparticle (ONP) properties, dispersion, and their impact on microstructure were analyzed via scanning electron microscopy, transmission electron microscopy, electron channeling contrast imaging, and X‐ray fluorescence. Mechanical properties are evaluated through hardness, compression, and creep testing at 600 °C. Laser‐generated ONPs exhibited narrower size distributions (D₉₀ = 10 nm) and finer initial dispersion, enabling grain refinement and increased flow stress at 1.0 vol%, increased agglomeration lowered ONP dispersion and increased interparticle distance. Chemically synthesized ONPs show broader distributions and less uniform dispersion, but result in finer grains after heat treatment. Despite coarser grains, the sample with 1.0 vol% laser‐generated ONPs shows the lowest creep rate, indicating that a sufficient ONP concentration with limited agglomeration is more critical for creep resistance than grain refinement alone. The results demonstrate that the ONP synthesis route and loading influence the microstructure and ONPs amount‐specific strengthening, guiding the design of ODS steels for additive manufacturing.

Traditionally, repairing coated substrates requires completely removing damaged, wear-resistant layers before recoating. This process leads to high costs, extended downtime, and material waste. Flexible brazing tapes, which are composed of alloy powder and an organic binder, offer an alternative to full coating removal for targeted repairs. Despite this, the process of vacuum brazing these tapes may lead to the formation of defects, including pores caused by trapped gases or residual binder, which compromise coating durability and corrosion resistance. This study focuses on the utilization of laser remelting as a method for post-processing nickel- and iron-based mixed alloy brazing tapes, with the aim of improving the integrity of the coating. Surface quality was assessed via microscopy and microhardness testing by systematically varying laser power, scanning speed, and hatch distance. Among the parameters studied, the most suitable laser parameter combination was found to be 350 W laser power, 250 mm/s scanning speed, and a hatch distance of 0.02 mm. These parameters yielded crack- and pore-free coatings with a remelting depth of 160.3 ± 17.2 µm and a microhardness of 701 ± 23 HV1, which is an 85% increase over as-brazed samples. Wear testing revealed a reduced coefficient of friction, and electrochemical corrosion tests showed lower corrosion current density and enhanced repassivation behavior in remelted coatings. These improvements demonstrate that laser remelting significantly enhances the microstructure, hardness, wear resistance, and corrosion performance of brazed coatings, providing an effective method for localized repair while minimizing material consumption and processing duration.