An investigation into the effects of cyclic strain rate on the high cycle and very high cycle fatigue behaviors of wrought and additively manufactured Inconel 718

Muhammad, Muztahid; Frye, Palmer; Simsiriwong, Jutima; Shao, Shuai; Shamsaei, Nima

doi:10.1016/j.ijfatigue.2020.106038

Title: An investigation into the effects of cyclic strain rate on the high cycle and very high cycle fatigue behaviors of wrought and additively manufactured Inconel 718

Journal Article · Mon Nov 23 00:00:00 EST 2020 · International Journal of Fatigue

DOI:https://doi.org/10.1016/j.ijfatigue.2020.106038· OSTI ID:1867811

Muhammad, Muztahid ^[1]; Frye, Palmer ^[2]; Simsiriwong, Jutima ^[3]; Shao, Shuai ^[1]; Shamsaei, Nima ^[1]

Auburn Univ., AL (United States)
Univ. of North Florida, Jacksonville, FL (United States)
Auburn Univ., AL (United States); Univ. of North Florida, Jacksonville, FL (United States)

Additive Manufacturing (AM) has increasingly been used to fabricate parts in aerospace applications, which may require service lives beyond ten-million cycles due to the imposed high loading frequencies. Understanding the very high cycle fatigue (VHCF) behavior of these additive manufactured (AM) parts is an important step towards their design and qualification processes. This study focuses on the high cycle fatigue (HCF) and VHCF behaviors of both wrought and laser beam-powder bed fusion (LB-PBF) fabricated Inconel 718 in machined/polished surface condition, emphasizing on the influence of test frequency (i.e., cyclic strain rate). Uniaxial, fully-reversed force- and stress-controlled fatigue tests were conducted utilizing a servo-hydraulic and an ultrasonic test system operating at 5 Hz and 20 kHz, respectively, on wrought as well as LB-PBF vertically and diagonally built specimens. Fatigue cracks in the majority of the specimens were found to initiate from intra-granular slip bands near or at the surface, which gives rise to strong anisotropy in fatigue resistance in LB-PBF specimens due to the presence of columnar grains along the build directions. Longer fatigue lives were obtained at 20 kHz, which was ascribed to possibly lower-than-intended stresses applied in the ultrasonic tests. The corrected stress-life fatigue data at 20 kHz were found to converge to the one obtained from conventional testing at 5 Hz, implying no effect of cyclic strain rate on the fatigue behavior of Inconel 718 regardless of the fabrication process. The findings of this work confirm the use of ultrasonic fatigue testing to expedite generation of AM materials data to keep up with the current demand; however, the applied stress may need to be corrected.

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Research Organization:: Louisiana State Univ., Baton Rouge, LA (United States)

Sponsoring Organization:: National Aeronautics and Space Administration (NASA); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019378; NNX17AJ93A; 80MSFC17M0023

OSTI ID:: 1867811

Alternate ID(s):: OSTI ID: 1776376; OSTI ID: 1853133

Journal Information:: International Journal of Fatigue, Vol. 144; ISSN 0142-1123

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: An investigation into the effects of cyclic strain rate on the high cycle and very high cycle fatigue behaviors of wrought and additively manufactured Inconel 718

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