TECHNOLOGY LICENSING OPPORTUNITY: AddiSteel HT

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Additively Manufactured Ferritic Steel with Enhanced High-Temperature Performance

Grade 91 steel is one of the most widely used structural metals in power plants and candidate for advanced nuclear reactors, but it loses much of its strength when operating temperatures climb above 500°C. Researchers at Los Alamos National Laboratory solved that problem by 3D-printing Grade 91 steel using a powder bed fusion process with carefully tuned laser settings. The rapid heating and cooling that occurs during printing creates a microstructure unlike anything achievable through traditional steelmaking, and the printed steel is up to 85% stronger at 600°C than its conventionally made counterpart while remaining just as ductile. A granted U.S. patent (US 11,471,946 B2) protects both the manufacturing method and the resulting material.

Value Proposition

AddiSteel HT gives manufacturers the ability to produce complex steel parts that hold up far better under extreme heat than today’s standard materials. Because the process uses commercially available Grade 91 powder and standard industrial 3D printers, adoption does not require exotic raw materials or entirely new equipment. The performance gains are significant enough that printed ferritic steel could serve as a lower-cost alternative to nickel-based superalloys in many high-temperature applications, opening the door to lighter, cheaper and more geometrically creative component designs across the energy and industrial sectors.

How it Works

A laser selectively melts thin layers of steel powder, one on top of another, to build a solid part from the ground up. LANL’s innovation lies in a proprietary combination of laser power, scanning speed and layer orientation that produces an unusually fine and complex grain structure with a combination of ductile and strong grains during printing. The steels thermal history during the build process creates the microstructure distribution of around 80 % by volume Bainitic grains with a uniform distribution of second phase particles and dislocations, surrounded by 20 % by volume Martensitic grains. This is fundamentally different from what conventional casting or forging can achieve. Each new layer also partially heat-treats the layer beneath it, so the finished part may need little or no additional processing before use.

Technical Description

Conventional Grade 91 steel relies on a tempered martensite structure that loses strength significantly at high temperatures. The additive process instead produces a layered architecture containing multiple distinct microstructural zones within each laser pass, including regions with extremely fine grains, regions rich in strengthening precipitates and small pockets of martensite at the boundaries between passes. Working together, these features resist deformation at elevated temperatures far more effectively than the uniform microstructure of wrought steel.

Testing confirms the advantage across the board. At 600°C, the printed steel reaches a yield strength of 650 MPa versus 350 MPa for the wrought version. Even after being held at 650°C for 1000 hours — a test simulating long-term service — the printed material retains 650 MPa of yield strength at room temperature. The patent covers process parameters for both Grade 91 and Grade 92 steel compositions, broadening the range of potential applications.

Advantages

• Up to 85% stronger at 600 °C than conventionally processed Grade 91 steel


• Stronger and more ductile at the same time, avoiding the usual tradeoff between strength and ductility


• Potential to replace costly nickel superalloys in many high-heat applications, reducing material expense


• Complex shapes printed directly from digital designs, cutting machining waste and production lead times


• Proven thermal stability after extended high-temperature exposure


• Works with multiple steel grades, including Grade 91 and Grade 92

Market Applications

• Nuclear Energy (reactor components, fuel cladding, steam generators)


• Power Generation (boiler piping, turbine parts, heat exchangers)


• Automotive and Transportation (exhaust system components, turbocharger housings)


• Oil, Gas and Chemical Processing (high-temperature piping, pressure vessels)


• Aerospace and Defense (structural parts exposed to extreme heat)


• Industrial Manufacturing (custom tooling, high-heat process equipment)

TRL 5

U.S. Patent No. 11,471,946

LA-UR-26-23628

LANL Tech Partnerships: Unlock the Innovative Potential

Los Alamos National Laboratory offers a wide range of cutting-edge technologies and capabilities that may provide your company with a competitive edge in the market and unlock the innovative potential that can enhance, refine, and revolutionize your products.

LANL’s licensing program focuses on moving inventions developed by our researchers to commercial innovations. Patented and patent pending inventions and copyrighted software are available to existing and start-up companies through exclusive and non-exclusive licensing agreements. For specific discussions, please contact licensing@lanl.gov.

Note: This is not a call for external services for the development of this technology.

https://www.lanl.gov/engage/collaboration/feynman-center/partner-with-us/licensing-technology

m.lanl.gov/tech-search

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