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Title: Strain energy-based fatigue failure analyses of LB-PBF Inconel 718: Effect of build orientation

Journal Article · · Additive Manufacturing
 [1];  [2];  [3];  [2];  [3];  [3]
  1. Louisiana State Univ., Baton Rouge, LA (United States); Louisiana State University
  2. Louisiana State Univ., Baton Rouge, LA (United States)
  3. Auburn Univ., AL (United States)

Additively manufactured Inconel 718 parts fabricated in three build orientations (horizontal, vertical, and angled at 45 degrees) are tested in fully-reversed bending fatigue mode. Damping measurements via the Impulse Excitation technique are used to assess the defects content in the microstructure and fractography analysis is performed to detect the root cause of failure. Two micro- and macro-scale methodologies of fatigue damage estimation based on the dissipated heat per cycle and the statistical estimation of micro-plastic strain energies are used to assess fatigue damage. It is shown that at a given stress level, the vertically built specimens endure the most fatigue damage before failure while the diagonally built ones sustain the least. As a result, the fatigue life is estimated for arbitrary load amplitudes via a microstructure-sensitive algorithm with acceptable accuracy as compared to the experiments.

Research Organization:
Louisiana State Univ., Baton Rouge, LA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0019378
OSTI ID:
1870856
Journal Information:
Additive Manufacturing, Journal Name: Additive Manufacturing Vol. 52; ISSN 2214-8604
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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