Fatigue performance differences between rolled and selective laser melted Ti6Al4V alloys

Xu, Zhaowen; Liu, An; Wang, Xi-Shu

doi:10.1016/j.matchar.2022.111963

Cited by 15 publications

(4 citation statements)

References 38 publications

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“…In particular, the fatigue strength of surface‐polished L‐PBF Ti‐6Al‐4V with no HIP processing was higher than that of as‐built L‐PBF Ti‐6Al‐4V with HIP process, 35 inferring that fatigue strength is markedly affected by surface roughness. In addition, the fatigue limit of rolled 64 Ti‐6Al‐4V is about 450 MPa, which is the same as that of heat‐treated 64 L‐PBF Ti‐6Al‐4V, but much larger than that of as‐built specimens in this study. This indicates that surface roughness has a significant effect on the degradation of fatigue strength of as‐built L‐PBF Ti‐6Al‐4V than that of heat‐treated L‐PBF Ti‐6Al‐4V.…”

Section: Resultssupporting

confidence: 53%

High‐cycle and very‐high‐cycle fatigue behavior at two stress ratios of Ti‐6Al‐4V manufactured via laser powder bed fusion with different surface states

Zheng

Zhong

et al. 2023

Fatigue Fract Eng Mat Struct

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The high-cycle fatigue (HCF) and very-high-cycle fatigue (VHCF) behavior of Ti-6Al-4V manufactured by laser powder bed fusion (L-PBF) was investigated to reveal the effects of surface roughness and stress ratio on fatigue performance. Fatigue tests were performed by an ultrasonic vibration machine with a frequency of 20 kHz. The fatigue strength of surface-polished specimens is generally higher than that of as-built specimens in HCF and VHCF regimes.Fatigue cracks initiated from the subsurface of as-built and surface-polished L-PBF Ti-6Al-4V. The values of size and depth for the defects that acted as fatigue crack origins present large scattering for L-PBF Ti-6Al-4V due to the interaction between surface roughness and subsurface defects. For surfacepolished L-PBF Ti-6Al-4V, fatigue cracks have almost the same resistance to propagation at both stress ratios of R = À1 and 0.7. K E Y W O R D Slaser powder bed fusion, stress ratio, surface roughness, Ti-6Al-4V, very-high-cycle fatigue Highlights• Fatigue strength of surface-polished specimens higher than as-built L-PBF Ti-6Al-4V • Fatigue crack initiation from lack-of-fusion defects in subsurface defectenriched layer • Defect & surface roughness with greater effect on crack initiation than stress ratio • Crack propagation much easier in as-built than surface-polished L-PBF Ti-6Al-4V

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Section: Resultssupporting

confidence: 53%

High‐cycle and very‐high‐cycle fatigue behavior at two stress ratios of Ti‐6Al‐4V manufactured via laser powder bed fusion with different surface states

Zheng

Zhong

et al. 2023

Fatigue Fract Eng Mat Struct

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“…• EBSD • Effect of the microstructure anisotropy on fatigue performance [68][69][70][71][72][73] • Effect of defects in AM materials on fatigue cracking behavior 74,75 See terminology for abbreviations. orientation and fastest in (011) [100] orientation.…”

Section: Ni-based Single-crystal Superalloysmentioning

confidence: 99%

“…90 Due to the anisotropy of the microstructure in different build directions, it is important to investigate the propagation behavior of fatigue small cracks in AM materials. Wang et al 68,69 investigated the fatigue behavior of Ti6Al4V alloy fabricated using selective laser melting (SLM) in different building directions. Fig.…”

Section: Additive Manufacturingmentioning

confidence: 99%

In situ SEM fatigue testing technology for metallic materials: a review

Zhang,

Li,

Zhang

et al. 2024

Nanoscale

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“…Additive manufacturing (AM) technology has significant advantages in the rapid prototyping and near net line manufacturing of complex-shaped parts and has great potential in aerospace, biomedical and other fields [ 1 , 2 , 3 ]. Therefore, additional post-processing for current AM parts is required to improve the dimensional machining accuracy and surface quality.…”

Section: Introductionmentioning

confidence: 99%

Research on the Cutting Force and Serrated Chips in Ultra-Precision Micro-Grooving of SLM Ti6Al4V Alloy

et al. 2023

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Selective laser melting (SLM) has significant advantages in the near net shape manufacturing of metal parts with complex geometries. However, SLM parts usually have problems such as poor surface quality and low dimensional accuracy, which require post-processing. This paper focuses on the research around the influence of ultra-precision micro-grooving the SLM Ti6Al4V alloy on the cutting force and serrated chips. The influence of the processing parameters on the cutting force and surface processing quality was analyzed in detail, and the cutting simulation model of the SLM Ti6Al4V alloy was established. The formation process of the serrated chip was successfully simulated, and the experiments verified the reliability of the established model. The research results show that the dynamic cutting force and surface processing quality are mainly related to the depth of cut, and the two trends are consistent. It is also shown that the serrated chip begins on the free surface of the workpiece and propagates deeply in the shear zone, forming a shear band, and its serrated nodules move upward and forward to form periodic serrated chips.

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Fatigue performance differences between rolled and selective laser melted Ti6Al4V alloys

Cited by 15 publications

References 38 publications

High‐cycle and very‐high‐cycle fatigue behavior at two stress ratios of Ti‐6Al‐4V manufactured via laser powder bed fusion with different surface states

High‐cycle and very‐high‐cycle fatigue behavior at two stress ratios of Ti‐6Al‐4V manufactured via laser powder bed fusion with different surface states

In situ SEM fatigue testing technology for metallic materials: a review

Research on the Cutting Force and Serrated Chips in Ultra-Precision Micro-Grooving of SLM Ti6Al4V Alloy

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