Respuesta rápida
CM247LC PREP spherical powder is a high-gamma-prime nickel superalloy powder produced by the plasma rotating electrode process, delivering the creep strength of the cast CM247LC blade alloy in a crucible-free, ultra-clean powder form for additive manufacturing and hot isostatic pressing. With roughly 65-70 volume percent gamma prime, the alloy sustains service temperatures to 1000-1050 C and offers creep rupture life comparable to directionally solidified cast material. PREP production gives sphericity above 0.95, oxygen content at or below 150 ppm, and virtually no ceramic inclusions, making the powder the premium choice for turbine blade repair, hot-section components, and high-integrity rotating parts where powder cleanliness directly governs fatigue performance.
| Propiedad | Valor |
|---|---|
| Sistema de aleación | Ni-based gamma-prime superalloy (cast-blade grade) |
| Gamma Prime Fraction | 65-70 vol% |
| Densidad | 8.54 g/cm3 |
| Typical Powder Size | 45-106 um (HIP/EBM), 53-150 um (DED) |
| Sphericity (PREP) | >= 0.95 |
| Contenido de oxígeno | <= 150 ppm |
| Temperatura máxima de servicio | 1000-1050 C |
| Ventaja clave | Blade-grade creep strength with crucible-free powder cleanliness |
What Is CM247LC PREP Spherical Powder and Its Material Benefits
CM247LC PREP spherical powder belongs to the polvos a base de níquel family and is the powder-metallurgy form of CM247LC, a low-carbon derivative of the MAR-M247 cast superalloy originally developed for directionally solidified and single-crystal turbine blades. The chemistry is deliberately retained from the cast alloy: a nickel matrix strengthened by a very high fraction of ordered Ni3(Al,Ti,Ta) gamma prime, plus heavy solid-solution elements such as tungsten and tantalum and a grain-boundary package of hafnium, carbon, boron, and zirconium.
The defining difference lies in how the powder is made. The proceso de electrodo giratorio de plasma (PREP) melts the tip of a rotating alloy bar with a plasma arc and ejects droplets centrifugally into an inert chamber. Because no ceramic crucible or nozzle contacts the melt, the powder avoids the ceramic inclusions that limit fatigue life in gas-atomized superalloy powder, and oxygen pickup stays exceptionally low.
For hot-section engineering, this combination delivers concrete benefits:
- Blade-grade temperature capability. The alloy retains useful strength to 1000-1050 C, roughly 300 C beyond the practical ceiling of Inconel 718, placing it among the strongest printable nickel alloys available.
- Outstanding creep and rupture performance. High gamma prime content plus W and Ta solid-solution strengthening gives long rupture life under sustained high-temperature load, the primary design criterion for turbine components.
- Superior powder cleanliness. PREP particles are nearly free of slag and refractory inclusions, which raises the fatigue ceiling of HIP-consolidated and deposited material.
- Excellent microstructural consistency. Rapid, crucible-free solidification produces homogeneous microsegregation patterns that respond predictably to homogenization and aging heat treatments.
- Repair and additive compatibility. The powder is widely used in DED and laser cladding to rebuild worn blade tips and vanes, where chemistry matching the parent cast alloy is mandatory.
It is important to note that CM247LC is a non-weldable-class alloy: its high Al plus Ti content makes it prone to solidification and strain-age cracking in powder bed fusion. It is therefore processed mainly by HIP consolidation, DED repair, electron beam melting with high preheat, and thermal spray rather than conventional LPBF, a distinction buyers should recognize when planning an AM program. Process selection, build preheat strategy, and post-build heat treatment should all be agreed with the powder supplier before a qualification campaign begins, because parameter windows developed for weldable superalloys do not transfer to this material.
Chemical Composition Details and Alloying Element Contributions
The composition of CM247LC is a carefully balanced package in which roughly half the alloying content drives gamma prime formation and the remainder tunes solid-solution strength, carbide formation, and oxidation resistance. The low carbon level relative to MAR-M247 improves castability and ductility while retaining grain-boundary carbide strengthening.
Chemical Composition of CM247LC
| Elemento | Mín. (wt%) | Max (wt%) | Papel |
|---|---|---|---|
| Ni | Saldo | Saldo | FCC gamma matrix hosting all strengthening phases |
| Cr | 7.8 | 8.4 | Oxidation and hot-corrosion resistance via Cr2O3 scale |
| Co | 9.0 | 9.5 | Raises gamma prime solvus; improves creep and microstructural stability |
| Mes | 0.4 | 0.6 | Solid-solution strengthener; partitions to the gamma matrix |
| W | 9.2 | 9.8 | Heavy solid-solution strengthener; slows diffusion-driven creep |
| Ejército de reserva | 3.0 | 3.4 | Potent gamma prime former; raises high-temperature strength and stability |
| Alabama | 5.4 | 5.8 | Primary gamma prime former; builds protective Al2O3 at temperature |
| Ti | 0.6 | 0.8 | Gamma prime former; substitutes into Ni3(Al,Ti,Ta) |
| Hf | 1.2 | 1.6 | Grain-boundary strengthener; forms stable MC carbides; aids castability |
| C | 0.05 | 0.09 | Forms MC and M23C6 carbides that pin grain boundaries |
| B | 0.010 | 0.020 | Grain-boundary cohesion; improves rupture ductility |
| Zr | 0.005 | 0.015 | Grain-boundary strengthening; scavenges sulfur |
| O | – | 0.015 | Powder-quality limit; kept minimal by crucible-free PREP melting |
Three features of this chemistry deserve buyer attention. First, the combined Al and Ti content of roughly 6.2-6.6 wt% is what classifies the alloy as difficult to weld and dictates the process-selection caution described above. Second, hafnium at over 1 wt% is unusual among printable superalloys and is central to the alloy’s transverse creep ductility in polycrystalline form. Third, the sub-150 ppm oxygen capability of PREP powder preserves the low inclusion content that the fatigue-critical applications of this alloy demand, something conventional atomización por gas (GA) approaches with higher but still qualified oxygen levels.
Physical and Mechanical Properties Full Data Sheet Reference
The data below consolidate typical values for HIP-consolidated and heat-treated CM247LC, with cast directionally solidified reference values where relevant. Actual properties depend on consolidation route, heat treatment, and test orientation, and lot-specific data should always be taken from the supplier certificate of analysis.
Propiedades clave
| Propiedad | Valor | Unidad |
|---|---|---|
| Densidad | 8.54 | g/cm3 |
| Intervalo de fusión | 1245-1370 | C |
| Gamma Prime Solvus | ~1230 | C |
| Conductividad térmica (RT) | ~10.5 | W/m·K |
| Coefficient of Thermal Expansion (20-1000 C) | 16-18 x 10-6 | /K |
| Young’s Modulus (RT) | ~205 | GPa |
| Yield Strength (RT, heat treated) | 850-950 | MPa |
| Tensile Strength (RT, heat treated) | 1000-1100 | MPa |
| Alargamiento (RT) | 4-8 | % |
| Yield Strength (870 C) | 650-750 | MPa |
| Stress Rupture (980 C / 200 MPa) | >50 | h |
| Hardness (heat treated) | 380-440 | HV |
| Temperatura máxima de servicio | 1000-1050 | C |
The property profile shows why this alloy occupies the top tier of printable nickel materials. Room-temperature strength exceeds Inconel 718 by a modest margin, but the decisive advantage appears above 800 C, where the high gamma prime fraction maintains yield strength and creep resistance long after precipitation-hardened alloys such as 718 have over-aged and softened.
Ductility is the corresponding trade-off. Elongation of 4-8 percent is typical for a blade-class alloy, and it is adequate for hot-section components designed against creep and low-cycle fatigue rather than gross plastic deformation. The hafnium and carbon grain-boundary package is specifically responsible for keeping rupture ductility acceptable under long-term high-temperature exposure.
For AM users, the gamma prime solvus near 1230 C defines the heat treatment window: solution treatment must approach this temperature to homogenize the as-consolidated microstructure, followed by controlled aging to precipitate the fine secondary gamma prime that delivers final strength.
Specifications PSD Tolerances and Available Grade Options List
CM247LC PREP powder is supplied in size fractions matched to HIP, DED, EBM, and spraying processes, with tighter morphology and cleanliness tolerances than gas-atomized equivalents.
Especificaciones disponibles
| Parámetro | Estándar/Valor |
|---|---|
| Particle Size Distribution (HIP/EBM) | 45-106 µm |
| Distribución del tamaño de las partículas (DED/recubrimiento) | 53-150 um, 75-180 um |
| Particle Size Distribution (thermal spray) | 20-75 um |
| Esfericidad | >= 0.95 |
| Densidad aparente | >= 4,8 g/cm³ |
| Densidad del grifo | >= 5.3 g/cm3 |
| Caudal del conducto | <= 14 s/50g |
| Contenido de oxígeno | <= 150 ppm |
| Contenido de nitrógeno | <= 100 ppm |
| Hollow Particle Rate | Very low (centrifugal solidification) |
| Ceramic Inclusion Content | Essentially nil (crucible-free) |
| Opciones de grado | Standard CM247LC; low-oxygen premium grade; modified Hf/B variants on request |
| Embalaje | Vacuum-sealed, argon-flushed, 5-50 kg |
| Composición personalizada | Disponible bajo pedido |
PREP powder characteristically has a narrower and coarser distribution than GA powder, with relatively few particles below 20 um. This is an advantage for DED and HIP, where coarse, highly spherical, free-flowing powder improves feeding stability and packing density, but it means LPBF users seeking 15-45 um cuts should discuss yield and pricing with the supplier, since fine fractions represent a smaller share of PREP output.
All lots are released with full chemistry, PSD, flow, and morphology certification, and premium grades can be supplied with additional X-ray CT screening of hollow particles and enhanced inclusion inspection for rotating-part applications.
Production Methods Atomization and Powder Conditioning Process
PREP production of CM247LC begins with a vacuum-induction-melted and refined alloy bar, which is rotated at high speed inside an inert-gas chamber while a plasma arc melts its tip. Centrifugal force ejects molten droplets that spheroidize and solidify in flight without contacting any crucible, nozzle, or chamber wall material. This mechanism is the source of the powder’s two signature qualities: essentially zero ceramic contamination and oxygen pickup limited to the low hundreds of parts per million or below.
For a highly alloyed superalloy such as CM247LC, crucible-free melting carries extra significance. Aluminum, titanium, and hafnium are all reactive with oxide refractories, so contact melting inevitably introduces inclusions and locally depletes these elements; PREP avoids both failure modes and delivers powder whose chemistry closely matches the bar stock.
Powder conditioning after collection follows a controlled sequence:
- Clasificación by sieving and air separation isolates the target size fractions and removes fines.
- Flow and density verification confirms Hall flow, apparent density, and tap density against the release specification.
- Full chemical analysis by ICP-OES and inert gas fusion verifies all twelve controlled elements plus O and N on every lot.
- Morphology and surface inspection by SEM confirms sphericity, satellite levels, and the absence of surface oxides.
- Internal quality screening by metallographic cross-section or X-ray CT quantifies hollow particles.
- Vacuum and argon packaging with desiccant protects the powder from moisture and oxidation during storage and transport.
Heat treatment after consolidation follows the cast alloy’s established practice: a solution step close to the gamma prime solvus to dissolve segregated phases and eutectic gamma prime, followed by one or more aging steps that precipitate the fine secondary gamma prime responsible for final strength. Buyers consolidating powder by HIP should confirm with the supplier whether the recommended cycle differs from the cast-alloy specification, since the finer as-atomized microstructure can respond to slightly lower solution temperatures and shorter hold times.
Where programs permit it, GA-produced CM247LC offers a lower-cost alternative with finer available cuts, and a comparison of the two routes is described on the polvos GA page. For HIP rotating parts, blade repair, and qualification programs where inclusion content is contractually limited, PREP remains the default specification.
Applications by Industry Aerospace Medical and Energy Sectors
CM247LC PREP spherical powder serves a concentrated set of high-value applications in which temperature capability and cleanliness justify premium powder cost. Sector context is available on the aplicaciones página.
Aerospace turbine hot sections. The dominant application is the manufacture and repair of turbine blades and vanes. DED and laser cladding with chemistry-matched CM247LC powder rebuild worn blade tips and damaged vane segments on directionally solidified and single-crystal hardware, restoring geometry at a fraction of replacement cost. HIP-consolidated powder also produces near-net-shape hot-section components such as seal segments and small structural castings replacements.
Industrial gas turbines and energy. Power-generation turbines operate at similar firing temperatures to aero engines but with far longer overhaul intervals, which favors HIP powder metallurgy components with cast-equivalent creep performance. Combustor hardware, transition pieces, and turbine shrouds are active qualification areas, and thermal spray grades of the powder serve as bond coats and oxidation-resistant overlays.
Turbochargers and rotating machinery. High-performance turbocharger turbine wheels operate at the temperature limit of cast superalloys, and HIP-consolidated CM247LC offers a route to wheels with finer, more homogeneous microstructures than casting can deliver. The low inclusion content of PREP powder is decisive here because turbocharger wheels are fatigue-limited rotating parts.
Medical and dental (emerging). While nickel superalloys are not implant materials, the dental and medical tooling sector uses high-temperature nickel alloys for hot-working dies, and research programs are evaluating PREP superalloy powder for sterile-environment equipment exposed to repeated high-temperature sterilization cycles. The crucible-free purity of PREP powder supports the cleanliness documentation these regulated sectors require.
Research and qualification programs. CM247LC ranks among the most studied high-gamma-prime alloys in the AM literature because it marks the boundary of printability for precipitation-hardened nickel systems. Universities and engine OEMs order PREP powder specifically to develop crack-mitigation strategies, graded repairs, and EBM high-temperature processing windows, making it a staple of advanced alloy development portfolios.
Comparación con otros grados y opciones alternativas de sistemas de aleaciones
Material selection around CM247LC typically benchmarks it against the weldable superalloy Inconel 718, the high-strength printable alloy Rene 65-class materials, and the closely related MAR-M247 cast composition.
CM247LC PREP Powder vs Alternative Alloys
| Propiedad | CM247LC (PREP) | Inconel 718 (GA) | MAR-M247 (cast) | Hastelloy X (GA) |
|---|---|---|---|---|
| Densidad (g/cm³) | 8.54 | 8.19 | 8.54 | 8.22 |
| Gamma Prime (vol%) | 65-70 | ~15 | 65-70 | 0 |
| Temperatura máxima de funcionamiento (°C) | 1000-1050 | 700 | 1000-1050 | 1100 (low stress) |
| RT Tensile (MPa) | 1000-1100 | 1100-1300 | 950-1050 | 750-800 |
| Creep Rupture (980 C) | Excelente | Pobre | Excelente | Moderado |
| Weldability / LPBF Suitability | Difícil | Excelente | Not applicable | Excelente |
| Powder Cleanliness (PREP) | Muy alta | N/A (GA standard) | N/A | N/A (GA standard) |
| Coste relativo del polvo | Muy alta | Medio | N/A | Medio |
Against Inconel 718, CM247LC concedes printability and low-temperature ductility but delivers a step change in temperature capability; 718 cannot be considered above roughly 700 C, while CM247LC operates 300 C higher. Against Hastelloy X, the solid-solution alloy prints far more easily and tolerates higher peak temperatures under low stress, but it lacks precipitation strengthening entirely and cannot carry significant load in creep-limited service. Against its cast parent MAR-M247, the PREP powder route offers matched chemistry with finer grain size, lower inclusion content, and near-net-shape capability that casting cannot achieve.
The selection logic is therefore narrow but decisive: when a component must carry sustained load above 900 C and the process route is HIP, DED, or EBM with high preheat, CM247LC PREP powder is among the strongest options available; when LPBF printability or cost governs, weldable grades such as 718 remain the correct choice.
Nuestra compañía
Shanghai Truer Technology Co., Ltd es un proveedor de fabricación aditiva con sede en China que integra equipos de fabricación de polvo PREP y polvos metálicos esféricos de alta calidad. Fundada en 2009, la empresa ofrece tanto atomización por gas (GA) y DEBERES capacidades de fabricación en aleaciones de níquel, aleaciones de titanio, aleaciones de aluminio, aceros inoxidables, aleaciones de cobalto, aleaciones de cobre, aleaciones de alta entropía y materiales especiales.
Truer ofrece servicios de desarrollo de aleaciones a medida, creación de prototipos en lotes reducidos y producción a gran escala para sectores como el aeroespacial, los implantes médicos, el petróleo y el gas, y la automoción. La empresa gestiona un centro de innovación conjunto dedicado a la impresión 3D metálica en colaboración con instituciones de investigación de primer orden.
For inquiries about CM247LC PREP spherical powder or other metal powder requirements, contactar con el equipo.
Preguntas más frecuentes
Q1: What is the typical particle size distribution for CM247LC PREP spherical powder? A: The standard PREP cut is 45-106 um for HIP and EBM, with 53-150 um and 75-180 um fractions for DED and laser cladding. PREP naturally produces a coarse, narrow distribution with very few sub-20 um fines, which improves flowability and packing density in these processes.
Q2: Can CM247LC powder be used in LPBF systems? A: LPBF processing is challenging because the high Al and Ti content makes the alloy susceptible to solidification and strain-age cracking. It is mainly processed by HIP, DED repair, and EBM with high preheat, though research programs with modified scan strategies and heated build plates have demonstrated limited LPBF feasibility.
Q3: What certifications does CM247LC PREP powder come with? A: Every lot ships with a certificate of analysis covering full twelve-element chemistry, oxygen and nitrogen content, particle size distribution, Hall flow rate, and apparent and tap density. Premium grades can add SEM morphology reports, X-ray CT hollow-particle screening, and enhanced inclusion documentation.
Q4: What is the MOQ for ordering CM247LC PREP powder? A: Trial quantities of 5-10 kg are available for process development and qualification builds. Production orders are typically supplied in 25-50 kg vacuum-sealed, argon-flushed containers, with pricing reflecting the alloy’s high hafnium and tantalum content.
Q5: Can the composition of CM247LC be customized? A: Yes. Hafnium, boron, and carbon levels can be adjusted within or beyond the standard window to tune grain-boundary behavior for specific consolidation routes, and modified variants developed for improved printability can be produced through the supplier’s custom alloy development service.
Q6: What is the typical lead time for CM247LC PREP powder orders? A: Stock compositions usually ship within two to four weeks, reflecting the alloy bar preparation required before PREP conversion. Custom chemistries or premium cleanliness grades typically require six to ten weeks including bar melting, atomization scheduling, and the full certification package.
