Fatigue crack growth behavior of additively manufactured 17-4 PH stainless steel: Effects of build orientation and microstructure

Nezhadfar, P.D.; Burford, Emma; Anderson-Wedge, Kathryn; Zhang, Bin; Shao, Shuai; Daniewicz, S.R.

doi:10.1016/j.ijfatigue.2019.02.015

Cited by 85 publications

(40 citation statements)

References 31 publications

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“…These figures reveal that in this instance, there is variability in both the fatigue threshold and in the cyclic fracture toughness. The da/dN versus ΔK curves for heat-treated laser powder bed fusion 17-4 PH stainless steel specimens tested in the 90 o (Set 2) direction from [39]. This particular way of plotting collapses the computed curves into a single power law curve.…”

Section: Crack Growth In Additively Manufactured 17-4 Ph Stainless Steelmentioning

confidence: 98%

“…Next, we consider the crack growth data presented in [39] for a heat-treated additively manufactured 17-4 precipitation hardening (PH) stainless steel (SS). These specimens were manufactured using a laser powder bed fusion (LPBF) system.…”

Section: Crack Growth In Additively Manufactured 17-4 Ph Stainless Steelmentioning

confidence: 99%

“…This steel was labeled 17-4 PH Stainless Steel in our analysis. The CA-H900 heat-treatment process was used to increase the strength of the steel [39]. The CA-H900 heat-treatment process involved two steps.…”

Section: Crack Growth In Additively Manufactured 17-4 Ph Stainless Steelmentioning

confidence: 99%

“…Crack growth curves for heat-treated laser powder bed fusion 17-4 PH stainless steel specimens tested in the 0 • direction (Set 1) from[39]. The three last points of L-PVF-1d were not considered in the curve fitting.…”

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confidence: 99%

“…Crack growth curves for heat-treated laser powder bed fusion 17-4 PH stainless steel specimens tested in the 90 • (Set 2) direction from[39].A plot of the associated da/dN versus ∆κ curves are shown inFigures 11 and 12. It should not come as a surprise that when plotted in this form and when allowing for the variability in the fatigue threshold ∆K thr and A, the various crack growth curves essentially collapse onto the master curve:da/dN = 4.46 10 −10 [(∆K − ∆K thr )/(1 − K max /A) 1/2 ]1.83 (Materials 2020, 13, x FOR PEER REVIEW 14 of Crack growth curves for heat-treated laser powder bed fusion 17-4 PH stainless steel specimens tested in the 90 o (Set 2) direction from[39].…”

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Further Studies into Crack Growth in Additively Manufactured Materials

et al. 2020

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Understanding and characterizing crack growth is central to meeting the damage tolerance and durability requirements delineated in USAF Structures Bulletin EZ-SB-19-01 for the utilization of additive manufacturing (AM) in the sustainment of aging aircraft. In this context, the present paper discusses the effect of different AM processes, different build directions, and the variability in the crack growth rates related to AM Ti-6Al-4V, AM Inconel 625, and AM 17-4 PH stainless steel. This study reveals that crack growth in these three AM materials can be captured using the Hartman–Schijve crack growth equation and that the variability in the various da/dN versus ΔK curves can be modeled by allowing the terms ΔKthr and A to vary. It is also shown that for the AM Ti-6AL-4V processes considered, the variability in the cyclic fracture toughness appears to be greatest for specimens manufactured using selective layer melting (SLM).

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Section: Crack Growth In Additively Manufactured 17-4 Ph Stainless Steelmentioning

confidence: 98%

Section: Crack Growth In Additively Manufactured 17-4 Ph Stainless Steelmentioning

confidence: 99%

Section: Crack Growth In Additively Manufactured 17-4 Ph Stainless Steelmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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