Advanced Cold Spray Development for Aerospace Aluminum Alloys
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1 Advanced Cold Spray Development for Aerospace Aluminum Alloys presented by: Gehn Ferguson ARL Center for Cold Spray US Army Research Laboratory ATTN: RDRL-WMM-D, BLDG 4600 Aberdeen Proving Ground, MD Office Phone: , Fax:
2 Presentation Outline Initial State of Cold Spray of Al Alloys CS Aluminum Alloy Development Process Research Consortium and Modeling Efforts Powder Characterization Process Parameter Optimization Applications Development Repairs Qualification and Testing Current State of Cold Spray Aluminum Alloys
3 Cold Spray Coating Prior to Optimization
4 State-of-the-art CS Aluminum Alloy Development Modeling & Simulation Powder Processing Process Development/Optimization Characterization/Materials Database Hardware/Software Improvement Nondestructive Inspection/Controls Materials Properties Prediction Applications Transition MATERIALS BY DESIGN APPROACH ARL 5056 Al Modeling & Simulation Powder Synthesis Intelligent Processing & Controls Alloy Development/Optimization From ½ % 3% 6% 15% IMPROVE DUCTILITY 20% ARL Aerospace Aluminum
5 Powder Characterization Research Team-75 researchers from academia and industry Effect of temperature and particle cooling Effect of encapsulation on deformation NEU PSU CFD model WPI He spray condition (T p0 = 509 K and V p= 980 m/s) (a) N 2 spray condition (T p0 = 509 K and V p= 980 m/s) (b) Cold spray process Cold Spray Deposit Particle fracture Particle interface debonding Particle interface debonding Particle fracture (c) (e) (d) (f) SDSMT In-situ mechanical tests in SEM UTRC Material Peridynamics model ductility explained by particle impact model* Models will be calibrated & compared Continuum + Kinetic model Single particle impact test Predicted dislocation density map Quasi-coarse-grained dynamics UNT UCONN UNC UMASS & MIT
6 Holistic Approach to Cold Spray Research Holistic Approach to Cold Spray AM Integrated Computational Materials Engineering (ICME) Cold Spray Process User-input Parameters 6 Powder Production Microchemistry Microstructure Powder Process Production parameters Particle & grain size Impact Model Process Parameters Gas temperature Gas Process pressure Gas Parameters composition Particle feeder temp. Laser assistance Powder Processing Degassing Heat Powder treating Processing Milling Output from Powder Production Blending & Powder Pre- Processing models are used as input to the Particle predictive models to replace the Edisonian experimental approach Particle Impact Deformation Heat Particle generation Impact Recrystallization Post- Processing Machining Heat Bulk treating Material Forming Surface treating Prediction of Properties 6
7 Ballistic Impact of Particles Luke Bassett-WPI jet Aaron Nardi-UTRC 75 impact
8 Technical Results- Cold Spray Model Single Particle Subroutine Implementation Bilinear Johnson-Cook (NEU) Experimental Results (UMASS) Initial PTW Results (PSU) V = 175 m/sec V = 286 m/sec V = 416 m/sec V = 530 m/sec V = 663 m/sec V = 699 m/sec A. Alizadeh & S. Muftu, Northeastern University 2 sets of Johnson-Cook parameters required to create a 2 region curve fit that is strain-rate dependent W. Xie, J. H. Lee, UMASS 20 um diameter 6061 Al particle impact results J. Schreiber, T. Eden, I. Smid Penn State No parameter changes are required during analysis for PTW model.
9 5x10 7 5x10 6 2x10 6 Increasing Cooling Rate [ C/s] 1x mm
10 Powder Characterization Images of cross sectional view of 6061 powders produced through different methods resulting in significantly varied ductility due to the presence of internal defects.
11 Importance of Powder for the CS Process -325 mesh 5056 Al Flake Aluminum Powder Morphology -325 mesh Pure Al Spherical
12 Purity of Cold Sprayed Aluminum Oxygen content measured by Inert Gas Fusion ASTM E um HP-Al Powder Cold Spray HP-Al Coating 0.88 %Oxygen 0.58 %Oxygen *The oxygen content of the cold spray coating is largely determined by the oxygen content of the original powder, not the process.
13 Recipe and System is the Key to Quality Powder: 6061 Valimet Batch S Substrate Dimensions: 1/2 x 5 x 5 Substrate Prep: PSI Substrate Cleaning: Alcohol + Air Nozzle: Plastic-PBI Prechamber: Short Stainless Steel Wheel: 120 hole Gas Type: He Gas Mode: Pressure Gas Pressure: 20 bar Heater: 400C Gun, 350C Pre Powder Feeder: 1.3 RPM, N2 gas, 3.0 m3/hr flow Vibrator: 1 bar Stand off: 1 1/8 inch Raster Speed: 1000 mm/sec Step: -0.5
14 ESTCP-Joint Test Protocol (JTP) Mechanical Tests Full JTP Qualification Plan Corrosion Tests Microstructure (Porosity,Interface, etc) Adhesion Bond Test (ASTM C633) Triple Lug Shear Test Unscribed ASTM B117 Fretting Fatigue Scribed ASTM B117 Almen Strip and XRD (residual stress) GM9540 Scribed Flat Tensile Specimens (bulk material) Galvanic Corrosion (G71) RR Moore Rotating Beam Fatigue Impact Testing- ASTM D5420 Crevice Corrosion (G78) Bend Test Beach Corrosion Hardness G85 SO2 ROSAN Insert Test Adhesion of Coatings Surface finish 125RA Machinability
15 Microstructure of 6061 Al 100X Fully dense cold spray coating Etched 6061 Cold Spray Coating Coating Substrate ZE41A magnesium 200X Fully dense cold spray coating Coating Substrate
16 6061Aluminum Cold Spray Coating 6061 block-unetched-50x 6061 etched-50x
17 Bond Bar Adhesion (ASTM C633) 6061 Results: All Samples failed within the adhesive and not at the coating/substrate interface Alloy Average (ksi) Stdev (ksi) 95% Confidence (ksi) ZE41A-T , 11.6 AZ91C-T , 11.6 EV31-T , 11.7 ZE41A-T5 AZ91C-T6 EV31-T6 CP-Al ESTCP Data and DSTO Data show 10 ksi+
18 Glueless Adhesion Test Evaluate full adhesion strength Enables elevated temp testing Specimen Design Neck and cap design based on Huang and Fukanuma 1 Cold spray / substrate interface located in neck 1.5 substrate bar diameter to accommodate cold spray taper Fixturing Design Dual plate fixture accommodates varying cap thicknesses Couples to load frame similar to ASTM C633 uniaxial loading design Modifying ASTM C633 [1] Huang, R., Fukanuma, H. J. Thermal Spray Tech. 2012, 21, 3, 541. DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited
19 Glueless Adhesion Test Al 6061 cold spray on cast Al C355-T6 test specimens: as sprayed condition DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited
20 Glueless Adhesion Test Fixturing for uniaxial loading Tested specimen Failure at deposit/substrate interface DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited
21 Glueless Adhesion Test Cold Spray Al 6061 on Cast Mg ZE41A-T5 and Cast Al C355-T6 Glueless Adhesion Test Results Substrate Max Load (lbf) UTS (ksi) Failure Mode Mg ZE41A-T Adhesion to substrate failure Mg ZE41A-T Adhesion to substrate failure Mg ZE41A-T Adhesion to substrate failure Mg ZE41A-T Adhesion to substrate failure Mg ZE41A-T Adhesion to substrate failure Mg ZE41A-T Adhesion to substrate failure Al C355-T Adhesion to substrate failure Al C355-T Adhesion to substrate failure Al C355-T Adhesion to substrate failure Al C355-T Adhesion to substrate failure Al C355-T Adhesion to substrate failure Al C355-T Adhesion to substrate failure DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited
22 6061 Triple Lug Shear Test Results Alloy Average (ksi) Stdev (ksi) 95% Confidence (ksi) ZE41A-T , 20.8 AZ91C-T , 20.5 EV31-T , 23.7 AZ91C-T6 and EV31-T6 failed with a relatively clean break at coating the interface 7 out of 12 ZE41A-T5 samples failed within the Mg
23 Fatigue Testing of Cold Spray 6061Al on ZE41A Magnesium Localized simulated repair using ARL CS process parameters developed for the UH-60 Sump Typical inclusions dominate failure and is commensurate with fatigue results of base material Simulated Repair Site Cold Spray Repair after Machining 23
24 Fatigue Test Results
25 Mechanical Properties of CS Aluminum Alloy Parameters Specimen ID HRB %IACS Press. Temp UTS MPa (ksi) bar 400 C CS (34.6) bar 450 C CS (45.0) 5 %El bar 400 C CS (56.8) bar 500 C CS (50.2) bar 400 C CS (56.2) bar 400 C CS (47.3) bar 500 C CS (57.2) bar 500 C CS (58.9) bar 500 C CS (58.0) 22.7
26 Questions?
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