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Remarkable enhancement in thermal conductivity of stainless-steel leveraging metal composite via laser powder bed fusion: 316L-Cu composite

Journal Article · · Additive Manufacturing
 [1];  [2];  [3];  [3];  [4];  [5];  [6];  [2];  [3];  [3]
  1. Oregon State University, Corvallis, OR (United States); Advanced Technology and Manufacturing Institute (ATAMI), Corvallis, OR (United States); Oregon State University
  2. Oregon State University, Corvallis, OR (United States)
  3. Oregon State University, Corvallis, OR (United States); Advanced Technology and Manufacturing Institute (ATAMI), Corvallis, OR (United States)
  4. Ghent University (Belgium)
  5. Oryx Advanced Materials, Inc., Penang (Malaysia)
  6. Oryx Advanced Materials, Inc., Fremont, CA (United States)

This work aimed to significantly enhance the thermal conductivity of the SS matrix by fabricating a metal composite SS-Cu system utilizing a laser powder bed fusion process. The impact of process parameters on the microstructure of SS-Cu samples is investigated. Here, the processing and post-processing factors that influence the effective thermal conductivity of the metal composite SS-Cu system are discussed. Then, the effective thermal conductivity and mechanical properties of the SS-Cu composite are measured at room temperature and operating temperature of 300 °C. The optimized laser powder bed fusion parameters led to low Marangoni convection, high cooling rate, greater macro-segregation, and higher thermal conductivity values albeit at the cost of ductility in SS-Cu metal composite likely due to the presence of the unmelted powder particles. As-printed SS-60 vol % Cu and annealed SS-60 vol % Cu had 2.5X and 6.6X thermal conductivity enhancement, respectively. During annealing, phase separation, partial melting of Cu, and formation of a continuous network of Cu surrounding SS play a key role in enhancing the thermal conductivity of the SS-Cu metal composite structure.

Research Organization:
RAPID Manufacturing Institute, New York, NY (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0007888
OSTI ID:
2212447
Journal Information:
Additive Manufacturing, Journal Name: Additive Manufacturing Vol. 70; ISSN 2214-8604
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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