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Controlling microstructure and B2 ordering kinetics in Fe–Al system through additive manufacturing

Journal Article · · Journal of Materials Research and Technology
 [1];  [1];  [1];  [2];  [2];  [1];  [3];  [4];  [1]
  1. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
  3. GKN Aerospace, Fort Worth, TX (United States); Optomec, Inc., Albuquerque, NM (Untied States)
  4. TJ Lienert Consulting, LLC, Los Alamos, NM (United States); Optomec, Inc., Albuquerque, NM (Untied States)

Multi-material fabrication between steel and aluminum is challenging because of the formation of several intermetallic phases. Embrittling B2 ordered intermetallics form in the steel rich side and are stable till about 60% of Al dilution in steel. In this work by using multi-length scale characterization coupled with integrated computational process and thermokinetic modeling, we show that the ordered B2 intermetallics in the steel rich side of the Fe–Al system forms via a nucleation and growth mechanism. The extent of B2 ordered intermetallics can be controlled by modifying the directed energy deposition-additive manufacturing (DED-AM) process parameters. Our findings lay the foundation for enabling fabrication of crack-free functionally graded compositions between the two alloys.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Nuclear Energy (NE), Nuclear Fuel Cycle and Supply Chain. Fuel Cycle Research and Development Program
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2462878
Journal Information:
Journal of Materials Research and Technology, Journal Name: Journal of Materials Research and Technology Vol. 33; ISSN 2238-7854
Publisher:
Brazilian Metallurgical, Materials and Mining AssociationCopyright Statement
Country of Publication:
United States
Language:
English

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