Separation of the impact of residual stress and microstructure on the fatigue performance of LPBF Ti-6Al-4V at elevated temperature

Mishurova, Tatiana; Artzt, Katia; Rehmer, Birgit; Haubrich, Jan; Ávila, Luis; Schoenstein, Frédéric; Serrano-Muñoz, Itziar; Requena, Guillermo; Bruno, Giovanni

doi:10.1016/j.ijfatigue.2021.106239

Cited by 39 publications

(10 citation statements)

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“…There might also be the danger that voids may become surface defects when machining is performed to smooth the rough surface [20,174], an effect which was also reported for AM [84].…”

Section: Gas Poresmentioning

confidence: 79%

See 1 more Smart Citation

Damage tolerant design of additively manufactured metallic components subjected to cyclic loading: State of the art and challenges

Zerbst

Bruno

Buffière

et al. 2021

Progress in Materials Science

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155

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“…There might also be the danger that voids may become surface defects when machining is performed to smooth the rough surface [20,174], an effect which was also reported for AM [84].…”

Section: Gas Poresmentioning

confidence: 79%

“…On the other hand, one can use post processing (e.g. mechanical such as shot or shock peening [38], but also thermal such as hot isostatic pressing [39]) to induce (sub-) surface or bulk compressive stresses, thereby influencing the crack initiation or propagation behavior (respectively).…”

Section: Loadingmentioning

confidence: 99%

Damage tolerant design of additively manufactured metallic components subjected to cyclic loading: State of the art and challenges

Zerbst

Bruno

Buffière

et al. 2021

Progress in Materials Science

Self Cite

155

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“…In general, RS has already been shown to play an important role in the fatigue behavior of AM materials. [ 42 ] In fact, Ulbricht et al [ 43 ] showed that the largest longitudinal compressive RS in the 316L LPBF part is located in the specimen's center, and the value can reach up to −300 MPa. This value is comparable with the applied maximum loading in the present work and could explain our observations.…”

Section: Discussionmentioning

confidence: 99%

Artificial Defects in 316L Stainless Steel Produced by Laser Powder Bed Fusion: Printability, Microstructure, and Effects on the Very‐High‐Cycle Fatigue Behavior

et al. 2022

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The printability of artificial defects inside the additively manufactured laser powder bed fusion (LPBF) 316L stainless steel is investigated. The printing parameters of the LPBF process are optimized to produce artificial defects with reproducible sizes at desired positions while minimizing redundant porosity. The smallest obtained artificial defect is 90 μm in diameter. The accuracy of the geometry of the printed defect depends on both the height and the diameter in the input model. The effect of artificial defects on the very‐high‐cycle fatigue (VHCF) behavior of LPBF 316L stainless steel is also studied. The specimens printed with artificial defects in the center are tested under VHCF using an ultrasonic machine. Crack initiation is accompanied by the formation of a fine granular area (FGA), typical of VHCF. Despite the presence of relatively large artificial defects, FGA formation is observed around accidental natural printing defects closer to the surface, which can still be considered as internal. The causes for this occurrence are discussed.

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“…Despite the advantages of additive manufacturing, metal parts produced by AM processes can exhibit inferior properties compared to wrought machined parts, including higher surface roughness, porosity, dimensional variability, and residual stresses [ 16 , 17 ]. In particular, the high-surface roughness can significantly reduce fatigue life for components subjected to dynamic loading, thereby limiting suitable application areas.…”

Section: Introductionmentioning

confidence: 99%

The State of the Art in Machining Additively Manufactured Titanium Alloy Ti-6Al-4V

et al. 2023

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Titanium alloys are extensively used in various industries due to their excellent corrosion resistance and outstanding mechanical properties. However, titanium alloys are difficult to machine due to their low thermal conductivity and high chemical reactivity with tool materials. In recent years, there has been increasing interest in the use of titanium components produced by additive manufacturing (AM) for a range of high-value applications in aerospace, biomedical, and automotive industries. The machining of additively manufactured titanium alloys presents additional machining challenges as the alloys exhibit unique properties compared to their wrought counterparts, including increased anisotropy, strength, and hardness. The associated higher cutting forces, higher temperatures, accelerated tool wear, and decreased machinability lead to an expensive and unsustainable machining process. The challenges in machining additively manufactured titanium alloys are not comprehensively documented in the literature, and this paper aims to address this limitation. A review is presented on the machining characteristics of titanium alloys produced by different AM techniques, focusing on the effects of anisotropy, porosity, and post-processing treatment of additively manufactured Ti-6Al-4V, the most commonly used AM titanium alloy. The mechanisms resulting in different machining performance and quality are analysed, including the influence of a hybrid manufacturing approach combining AM with conventional methods. Based on the review of the latest developments, a future outlook for machining additively manufactured titanium alloys is presented.

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Separation of the impact of residual stress and microstructure on the fatigue performance of LPBF Ti-6Al-4V at elevated temperature

Cited by 39 publications

References 50 publications

Damage tolerant design of additively manufactured metallic components subjected to cyclic loading: State of the art and challenges

Damage tolerant design of additively manufactured metallic components subjected to cyclic loading: State of the art and challenges

Artificial Defects in 316L Stainless Steel Produced by Laser Powder Bed Fusion: Printability, Microstructure, and Effects on the Very‐High‐Cycle Fatigue Behavior

The State of the Art in Machining Additively Manufactured Titanium Alloy Ti-6Al-4V

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