Tensile fracture behavior and failure mechanism of additively-manufactured AISI 4140 low alloy steel by laser engineered net shaping

Hoyeol Kim, Zhichao Liu, Weilong Cong, Hong Chao Zhang

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

AISI 4140 powder was directly deposited on AISI 4140 wrought substrate using laser engineered net shaping (LENS) to investigate the compatibility of a LENS-deposited part with the substrate. Tensile testing at room temperature was performed to evaluate the interface bond performance and fracture behavior of the test specimens. All the samples failed within the as-deposited zone, indicating that the interfacial bond is stronger than the interlayer bond inside the deposit. The fracture surfaces were analyzed using scanning electron microscopy (SEM) and energy disperse X-ray spectrometry (EDS). Results show that the tensile fracture failure of the as-deposited part is primarily affected by lack-of-fusion defects, carbide precipitation, and oxide particles inclusions, which causes premature failure of the deposit by deteriorating the mechanical properties and structural integrity.

Original languageEnglish
Article number1283
JournalMaterials
Volume10
Issue number11
DOIs
StatePublished - Nov 1 2017

Keywords

  • Carbides precipitation
  • Fractography
  • Lack-of-fusion defects
  • Laser engineered net shaping
  • Oxide formation
  • Tensile test

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