Metal Powder Works Clears All Three ASTM Aerospace Benchmarks in L-PBF Testing
Metal Powder Works DirectPowder delivers ASTM structural performance across multiple AM processes
Metal Powder Works has announced that independent testing confirms its DirectPowder CP Titanium Grade 2 meets all three ASTM B384 structural benchmarks for Laser Powder Bed Fusion (L-PBF). The L-PBF results build on previously announced cold spray validation, demonstrating the powder’s versatility across multiple additive manufacturing processes. ASTM B384 standards underpin aerospace and defence qualification, establishing commercial relevance for structural applications. The company has produced hundreds of kilograms of compliant powder to date, positioning this as production-ready rather than laboratory-stage technology.
L-PBF testing achieved 112 ksi ultimate tensile strength, 94 ksi yield strength, and 29% elongation, substantially exceeding ASTM B384 minimums of 50 ksi UTS, 40 ksi yield, and 20% elongation. Oxygen control was maintained at ≤0.25%, meeting Grade 2 specification requirements. Meeting all three benchmarks simultaneously in L-PBF parts is the specific threshold required for aerospace and defence qualification submissions. A single feedstock serving multiple AM processes reduces customer qualification complexity and expands the addressable market.
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What is ASTM B384 and why does it matter for titanium powder qualification?
ASTM B384 defines the structural qualification standard for titanium used by aerospace and defence engineers. Materials failing these thresholds cannot be specified for structural applications without constraints. This standard was written for wrought titanium, making AM compliance a higher bar to clear. MPW is demonstrating both feedstock chemistry compliance and mechanical performance, something powder suppliers typically do not certify together.
Three benchmarks investors should understand are ultimate tensile strength (how much force before breaking), yield strength (force before permanent deformation), and elongation (ductility or flexibility). Most powder suppliers certify chemistry and particle size only, not the performance of parts made from that powder. MPW is certifying both, creating a differentiated commercial position.
Qualification to handbook values opens pathways to defence and aerospace programmes where structural certification is non-negotiable. Engineers cannot specify materials for structural design without verified ASTM compliance, limiting market access for unqualified powders regardless of cost advantages.
Mechanical results exceed Grade 2 requirements while maintaining chemistry control
The mechanical performance exceeds Grade 2 minimums, meeting the higher thresholds of Grade 4. This is commercially significant because Grade 4 permits higher oxygen content, which is easier to manage chemically, but MPW achieves Grade 4 strength within Grade 2 oxygen limits. The company attributes this to the room-temperature DirectPowder process preserving source bar purity. The powder has no fines and no satellites, with consistent lot-to-lot quality.
| Property | ASTM B384 Minimum | MPW L-PBF Result | Variance |
|---|---|---|---|
| Ultimate Tensile Strength | 50 ksi | 112 ksi | +124% |
| Yield Strength | 40 ksi | 94 ksi | +135% |
| Elongation to Fracture | 20% | 29% | +45% |
Delivering Grade 4 mechanical performance within Grade 2 chemistry is commercially differentiated. Customers receive higher performance without paying for Grade 4 powder or managing tighter oxygen specifications, which typically drive production costs and quality control complexity.
Cold spray validation adds second AM process confirmation
HAMR Industries previously reported meeting handbook strength requirements using MPW’s DirectPowder feedstock, achieving 83 ksi UTS via cold spray, 66% above the 50 ksi ASTM minimum. HAMR achieved 99% deposition efficiency using air as carrier gas rather than expensive nitrogen or helium. This positions cold spray as validation that DirectPowder performs at feedstock level where legacy atomisation and Hydride DeHydride (HDH) powder have struggled.
Cold spray additive manufacturing (CSAM) is a technically demanding process for powder feedstocks. Most powders optimised for L-PBF do not perform reliably in cold spray environments due to particle morphology and purity constraints. A single feedstock meeting structural standards across both L-PBF and cold spray is unique in the market, reducing customer qualification burden and broadening commercial applicability.
Third qualification programme underway with US Air Force research partner
The University of Dayton Research Institute (UDRI) programme is contracted by the US Air Force Rapid Sustainment Office (RSO), targeting structural repair applications. This represents a third independent validation pathway alongside L-PBF and cold spray. MPW will provide updates as the programme advances toward government repair qualification.
Government-contracted validation pathways create potential for defence programme adoption, a market where qualified suppliers enjoy long procurement cycles and recurring revenue streams. Defence qualification typically requires demonstrating consistent performance across multiple production lots and independent testing regimes, which MPW’s hundreds of kilograms of produced powder support.
Managing Director commentary on commercial positioning
John Barnes, Managing Director
“MPW can supply qualification-grade CP titanium at lower cost than atomised or HDH alternatives at equivalent or better oxygen control and purity, with better lot-to-lot consistency. This positions MPW powder to be qualified once and specified broadly across customer programmes.”
The “qualify once, specify broadly” commercial model reduces the barrier to adoption for customers evaluating multiple AM processes. Traditional powder suppliers require separate qualification programmes for each process, increasing time-to-market and engineering costs.
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What this means for MPW’s commercial trajectory
The announcement synthesises three investment case elements: production-ready powder, multi-process validation, and aerospace/defence qualification pathway. Hundreds of kilograms have already been produced and sold, confirming this is commercial rather than R&D stage. MPW’s 2024 Material Company of the Year recognition by 3D Printing Industry Awards provides independent industry validation. The company plans to expand to alloy system testing and property database compilation for customer qualification submissions.
Near-term catalysts include:
- UDRI structural repair programme results, establishing a government qualification pathway
- HAMR component-level deposition trials and customer-facing qualification package development
- Expanded alloy testing and property database compilation for customer submissions
Multiple concurrent qualification pathways de-risk the commercialisation timeline. Validation across L-PBF (the largest AM market) and cold spray creates broad addressable market exposure.
The DirectPowder process converts wrought bar stock directly to powder at room temperature without melting, gas jets, or crushing contaminated scrap. This preserves the chemistry and cleanliness of the certified source bar, reducing batch-to-batch variation that can limit mechanical performance of parts made from conventionally atomised powder. The process achieves >95% size yield without fines or satellites, enabling cost competitiveness versus atomised or HDH alternatives.
Powder suppliers typically certify feedstock chemistry to standards such as ASTM B348 or F67 (composition and particle size), not the mechanical properties of parts produced from that powder. MPW is certifying both feedstock chemistry and end-part performance, creating a qualification pathway that mirrors the requirements aerospace and defence customers already use for wrought titanium procurement.
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