articleNano Materials ScienceSep 10, 2022DIAMOND OA

Additive manufacturing of Ni-based superalloys: Residual stress, mechanisms of crack formation and strategies for crack inhibition

CGChuan GuoGLGan LiSLSheng LiXHXiaogang HuHLHongxing Lu

Southern University of Science and Technology · City University of Hong Kong, Shenzhen Research Institute · +2 more institutions

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Abstract

The additive manufacturing (AM) of Ni-based superalloys has attracted extensive interest from both academia and industry due to its unique capabilities to fabricate complex and high-performance components for use in high-end industrial systems. However, the intense temperature gradient induced by the rapid heating and cooling processes of AM can generate high levels of residual stress and metastable chemical and structural states, inevitably leading to severe metallurgical defects in Ni-based superalloys. Cracks are the greatest threat to these materials’ integrity as they can rapidly propagate and thereby cause sudden and non-predictable failure. Consequently, there is a need for a deeper understanding of…

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255
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11

Topics & keywords

Topics
Keywords
  • Superalloy
  • Residual stress
  • Materials science
  • Cracking
  • Stress (linguistics)
  • Metastability
  • Metallurgy
  • Microstructure
UN Sustainable Development Goals
  • Industry, innovation and infrastructure
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