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Grain Boundary Engineering in Additive Manufacturing (AM)

Award Information
Agency: Department of Defense
Branch: Defense Logistics Agency
Contract: SP4701-20-P-0052
Agency Tracking Number: L201-002-0028
Amount: $99,868.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: DLA201-002
Solicitation Number: 20.1
Solicitation Year: 2020
Award Year: 2020
Award Start Date (Proposal Award Date): 2020-06-15
Award End Date (Contract End Date): 2021-03-14
Small Business Information
LONG BEACH, CA 90804-1111
United States
DUNS: 603371238
HUBZone Owned: No
Woman Owned: Yes
Socially and Economically Disadvantaged: No
Principal Investigator
 Frank Abdi
 (562) 961-7827
Business Contact
Phone: (562) 961-7827
Research Institution

Proposal develops a comprehensive AM metal-powder Grain-Boundary-Engineering (GBE) toolset (hardware/software) to improve material failure strain. Phase I will demonstrate polycrystalline stainless-steel powder with inclusion, formation of coincidence-site-lattice (CSL) grain boundaries, low-angle-grain-boundaries (LAGB), and crystallization of AM coupons by: 1) post build heat-treatment, 2) analyze/optimize post build performance using machine-driven data, and integrated-computational-material-engineering (ICME); and 3) Optimize CSL/LAGB during AM by thermal-heating, fast-cooling, melt-excitation, and inclusion technique. First, feasibility of grainboundary modeling (GBM) will demonstrate several successful GE post heat-treatments using commercial AM machine. Second, Analysis by ICME, entailing: (i) Micro-thermal-management, to determine the thermal-history (melt-pool depth/width, superheated-cooling), Material state (voids/density), %crystallization, process-map of stable and unstable print regions (ii) grain-boundary-modeling (GBM) using creep-diffusion algorithms, predicting surfaceroughness, residual stress/strain, cracks (inter-granular/trans-granular), oxidation, and supported by visualization of construct 3D Voxel Electron-beam-scatter-diffraction (EBSD), (iii) Nano-Micro-mechanical analytical modeling, predicting mechanical properties (stresses-strain), layers distortion/curvature, considering inclusion, defects and uncertainties. Third, Optimization of machine parameters for formation of CSL/LAGB during/post AM coupon performance, and progressive-failure-analysis of improved mechanical properties (failure-strain, yield/ultimate strength).  ICME driven design will be compared/validated with tests including: a) printing stainless-steel coupon specimens using machine equipped in-Situ-monitored sensors, and NDE measurement, failure-strains, and b) use of SEM/TEM microscopy, EBSD imaging. 

* Information listed above is at the time of submission. *

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