Effects of crack orientation and heat treatment on fatigue-crack-growth behavior of AM 17-4 PH stainless steel

Yadollahi, Aref; Elwany, Alaa; Doude, Haley; Bian, Linkan; Newman, James C.

doi:10.1016/j.engfracmech.2020.106874

Cited by 33 publications

(17 citation statements)

References 38 publications

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“…The upper part of the curve was estimated from the low R tests (not shown) at the two conditions. 44 As seen in Figure 3C, FCG results in the LAB condition exhibited an unusual behaviour; in that, all R ratio tests agreed on a ΔK-rate basis. The reason for this behaviour was unclear; however, it might be attributed to having large amounts of residual stress in the specimen.…”

Section: Fatigue Crack Growthmentioning

confidence: 58%

“…The baseline Δ K eff ‐rate curve (solid curve with circular symbols) was found to be the same for the TAB and THT conditions, as shown in Figures A and B. The upper part of the curve was estimated from the low R tests (not shown) at the two conditions . As seen in Figure C, FCG results in the LAB condition exhibited an unusual behaviour; in that, all R ratio tests agreed on a Δ K ‐rate basis.…”

Section: Experimental Datamentioning

confidence: 63%

“…Thus, it is possible that the residual stresses play a less significant role for the VAB specimens, in which the notch orientation is perpendicular to the build direction, as compared with LAB specimens, in which the notch orientation is parallel to the build direction. Other studies have also reported crack‐growth in a nonstraight path, with respect to the notch orientation, for the AM specimens with a notch orientation parallel to the build direction in as‐built condition as a result of high residual stresses . The FCG tests were not conducted the heat‐treated MC(T) specimens with longitudinal crack (LHT).…”

Section: Experimental Datamentioning

confidence: 99%

“…Other studies have also reported crackgrowth in a nonstraight path, with respect to the notch orientation, for the AM specimens with a notch orientation parallel to the build direction in as-built condition as a result of high residual stresses. 44,45 The FCG tests were not conducted the heat-treated MC(T) specimens with longitudinal crack (LHT). The estimated (ΔK eff ) th value was 2.5 MPa√m for all conditions, which is shown by the vertical dashed line in Figure 3.…”

Section: Fatigue Crack Growthmentioning

confidence: 99%

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Fatigue‐life prediction of additively manufactured material: Effects of heat treatment and build orientation

Yadollahi

Elwany

Doude

et al. 2020

Fatigue Fract Eng Mat Struct

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In this study, the crack‐growth approach is used to predict the fatigue life of 17‐4 precipitation hardening (PH) stainless steel (SS) fabricated via an additive manufacturing (AM) system in different orientations (ie, vertical and horizontal) before and after heat treatment. To perform fatigue‐life calculations, the effective stress intensity factor as a function of crack‐growth rate was obtained from testing modified compact specimens with different crack orientations in as‐built and heat‐treated conditions. The plasticity‐induced crack closure model, FASTRAN, was used to calculate fatigue lives based on the size of process‐induced defects. Results indicated that in the presence of large voids (ie, lack‐of‐fusion defects), the total fatigue life of AM 17‐4 PH SS in as‐built and heat‐treated conditions is dominated by crack growth. Effect of build orientation on fatigue life of AM 17‐4 PH SS was also captured based on the size of defects projected on a plane perpendicular to the loading direction.

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Section: Fatigue Crack Growthmentioning

confidence: 58%

Section: Experimental Datamentioning

confidence: 63%

Section: Experimental Datamentioning

confidence: 99%

Section: Fatigue Crack Growthmentioning

confidence: 99%

See 2 more Smart Citations

Fatigue‐life prediction of additively manufactured material: Effects of heat treatment and build orientation

Yadollahi

Elwany

Doude

et al. 2020

Fatigue Fract Eng Mat Struct

Self Cite

View full text Add to dashboard Cite

show abstract

“…Microstructure and mechanical properties of various steels produced by AM such as austenitic, duplex, martensitic and precipitation-hardened steels were widely investigated [1], [7]. Such steels exhibit different microstructures and precipitation phases, which lead to variable mechanical properties [8]- [10]. Microstructures of AM steels have fine and crystallographical textures due to rapid solidification [10].…”

Section: Introductionmentioning

confidence: 99%

On mesoscale strain fluctuations in tensile tests on additively manufactured 17-4PH stainless steel

Bouaziz

Djouda

Hild

2021

The Journal of Strain Analysis for Engineering Design

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Additively manufactured materials usually exhibit mesoscale heterogeneities. Mesoscale fluctuations of strain fields in notched samples made of 17-4PH Stainless steel and loaded in tension are investigated. Regularized digital image correlation enables for the analysis of strain fluctuations at different length scales. Five tests on specimen fabricated with different printing parameters are studied. It is shown that the strain fluctuations have no characteristic length scale and are essentially independent of the probed processing parameters.

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Review on Fatigue of Additive Manufactured Metallic Alloys: Microstructure, Performance, Enhancement, and Assessment Methods

Liu,

Yu,

Guo

et al. 2023

Advanced Materials

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Additive manufacturing (AM), which is a process of building objects in a layer‐upon‐layer fashion from designed models, has received unprecedented attention from research and industry because it offers outstanding merits of flexibility, customization, reduced buy‐to‐fly ratio, and cost‐effectiveness. However, the fatigue performance of safety‐critical industrial components fabricated by AM is still far below that obtained from conventional methods. This review discusses the microstructural heterogeneities, randomly dispersed defects, poor surface quality, and complex residual stress generated during the AM process that can negatively impact the fatigue performance of as‐printed parts. The difference in microstructural origin of fatigue failure between conventionally manufactured and printed metals is reviewed with particular attention to the effects of the trans‐scale microstructures on AM fatigue failure mechanisms. Various methods for mitigating the fatigue issue, including pre‐process, inter‐process and post‐process treatments, are illustrated. Empirical, semi‐empirical and microstructure‐sensitive models are presented to predict fatigue strength and lifetime. Summary and outlooks for future development of the fatigue performance of AM materials are provided.This article is protected by copyright. All rights reserved

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Effects of crack orientation and heat treatment on fatigue-crack-growth behavior of AM 17-4 PH stainless steel

Cited by 33 publications

References 38 publications

Fatigue‐life prediction of additively manufactured material: Effects of heat treatment and build orientation

Fatigue‐life prediction of additively manufactured material: Effects of heat treatment and build orientation

On mesoscale strain fluctuations in tensile tests on additively manufactured 17-4PH stainless steel

Review on Fatigue of Additive Manufactured Metallic Alloys: Microstructure, Performance, Enhancement, and Assessment Methods

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