A research study has achieved a synergy between strength and ductility by in situ construction of three-dimensional (3D) graphene networks using laser powder bed fusion (LPBF). The method leverages the rapid thermal cycling of a nickel/polymer precursor during the LPBF process to grow 3D graphene networks in situ at metal grain boundaries. Test results show a 72% increase in tensile strength (reaching 648 MPa) while maintaining 54% elongation. From a materials science perspective, metal strengthening typically comes at the cost of ductility, with strength and ductility being mutually exclusive. This work addresses this trade-off by building 3D graphene networks at grain boundaries, simultaneously strengthening the boundaries and coordinating deformation, offering a new approach to designing high-strength, high-toughness metal materials. From an industrialization standpoint, this study represents frontier research in materials science. The demonstrated mechanism shows potential for extension to systems such as nickel-based superalloys and titanium alloys, but there remains a significant gap before engineering application and cost control are achieved, so it is prudent to focus on technology tracking at this stage. Value for powder purchasers: (1) Graphene/carbon nanotube-reinforced metal powders represent a differentiated, high-end powder direction; (2) Attention should be paid to the dispersion uniformity of carbon-reinforced powders and the printing process window, as these are the core challenges for industrialization; (3) Industrialization is still premature, and it is recommended to monitor this as a technology reserve. This information is derived from a Chinese-language report on a scholarly paper (Biotong, August 23, 2026) and reflects research-stage results, not mass-production technology.