A Hybrid Pathway to Critical Metal Components
Researchers at Oak Ridge National Laboratory (ORNL) are combining 3D printing metal components with hot isostatic pressing (HIP) to rethink how large, high‑value parts for energy and power systems are made. The team uses additive manufacturing to fabricate custom canisters for powder metallurgy HIP, a process that consolidates metal powder into fully dense structural components. Traditionally, these canisters are formed, machined and welded, a multi-step route that introduces defects, limits design freedom and stretches lead times. By 3D printing the canister to closely match the final geometry, ORNL moves much of the shaping work up front, reducing material waste and processing steps. After printing, the canister is filled with alloy powder, vacuum-sealed and densified in a HIP furnace. The result is a solid, defect‑minimized metal part produced with the geometric flexibility of additive manufacturing and the metallurgical quality of HIP.
From Canisters to Large Format Metal Parts
The same approach scales to large format metal parts that are difficult to source through conventional casting and forging. ORNL has demonstrated a 2,000‑pound HIP canister built using multiple additive methods, including wire-arc additive manufacturing, to form a near‑net‑shape mold for what appears to be a turbine blade. This hybrid additive manufacturing energy workflow bypasses fragile legacy supply chains while exploiting complex geometries that are difficult to forge or cast. Crucially, ORNL couples fabrication with mechanics‑based computational models that predict distortion and shape change under HIP conditions, reducing costly trial‑and‑error development. The ability to pair advanced alloys, predictive simulation and large‑scale 3D printed molds positions AM‑HIP as a practical route to next‑generation components for hydropower turbines and advanced reactors, where performance demands and qualification requirements are especially stringent.
Strengthening Supply Chain Security for Energy Infrastructure
ORNL’s hybrid AM‑HIP research is driven by more than engineering curiosity; it targets structural vulnerabilities in energy infrastructure supply chains. Large metal components for turbines, pressure vessels and similar systems often depend on a small number of qualified foundries and forges, leaving operators exposed to long lead times and geopolitical risk. By enabling 3D printing metal components and canisters locally and then densifying them with HIP, manufacturers gain an alternative pathway that reduces reliance on traditional casting and forging pipelines. Researchers emphasize that this method can help ease shortages, expand domestic manufacturing capacity and support national security objectives. At the same time, computational modeling of HIP behavior improves predictability and quality assurance, making the hybrid route more attractive for regulated energy applications where certification and repeatability are as critical as cost and schedule.
Hydropower Turbine Printing and Real-World Validation
The manufacturing strategy is already being tested in the field through hydropower turbine printing collaborations. Startup Cadens worked with ORNL’s Manufacturing Demonstration Facility to address the cost barrier of custom micro‑hydropower projects, where each site may require different geometries. Using its Turbine Builder software and ORNL’s large‑scale additive capabilities, the team designed a system around standardized PVC pipe, then added site‑specific components produced with big area additive manufacturing and other 3D printing tools. The project yielded a 3D‑printed hydropower turbine prototype that has reportedly operated successfully for more than six years, validating durability and performance. By balancing standard components with printed, custom interfaces, the approach shows how additive manufacturing energy solutions can unlock thousands of untapped low‑head sites, while the hybrid AM‑HIP toolkit points toward future metal runners and housings with even higher efficiency and robustness.
Cooling the Next Generation of Power Electronics
Beyond structural hardware, ORNL is also applying additive techniques to thermal management, an increasingly critical challenge as power electronics and control systems densify. Using electrochemical additive manufacturing, researchers have developed intricate cold plate concepts that integrate fine, tortuous flow paths impractical to machine conventionally. These cold plates can be tailored to fit tightly packed components, improving heat transfer and enabling higher power densities with greater reliability. While distinct from powder metallurgy hot isostatic pressing, the work underscores a common theme: additive manufacturing enables function‑driven geometries that traditional methods struggle to deliver. As advanced reactors, hydropower installations and grid equipment incorporate more sophisticated electronics, such cooling innovations will complement large format metal parts produced via AM‑HIP, creating an integrated ecosystem of printed structures and thermal management solutions for future energy infrastructure.