Evaluation of Orientation Dependence of Fracture Toughness and Fatigue Crack Propagation Behavior of As-Deposited ARCAM EBM Ti-6Al-4V

Seifi, Mohsen; Dahar, Matthew S.; Aman, Ron; Harrysson, Ola; Beuth, Jack; Lewandowski, John J.

doi:10.1007/s11837-015-1298-7

Cited by 96 publications

(59 citation statements)

References 26 publications

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“…EOS) deposits of Ti-6Al-4V, IN718, IN625, AlSi10Mg, CoCrMo, maraging steel and stainless steel are also in the various stages of being mapped. Maps of these powder fusion experiments are being correlated with surface roughness 37 and mechanical property measurements 11,12 being performed at CWRU. In addition to changes to the bead quality shown in Fig.…”

Section: Process Control and Process Mappingmentioning

confidence: 99%

“…Microstructure heterogeneity (morphology, crystallography, and alignment with build direction) is expected and perhaps desired in some cases. While location-specific microstructure heterogeneities are to be expected/desired in parts with complicated geometries due to geometrical heterogeneities, location-specific microstructure variability 11 has been reported in geometrically homogeneous primitive shapes (e.g., cuboids). While defects (e.g., lack of fusion, voids) detected in previous work 11 and shown in Fig.…”

Section: Microstructure and Defect Characterization/quantificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Our objective is to summarize ongoing work and issues as well as provide an update to the previous work 11 that has demonstrated location-and orientation-dependent properties on Ti-6Al-4V that are affected by microstructure variations and process-induced defects in as-deposited material. Although the asdeposited materials reported in that published work 11 exhibited some properties (i.e. fatigue crack growth, fracture toughness) approaching those of some cast/wrought materials, industrial input from both the aerospace and biomedical communities indicate the desire to use as-deposited materials in various applications where high cycle fatigue (HCF) properties are also critical.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Overview of Materials Qualification Needs for Metal Additive Manufacturing

Seifi

Salem

Beuth

et al. 2016

JOM

Self Cite

485

183

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This overview highlights some of the key aspects regarding materials qualification needs across the additive manufacturing (AM) spectrum. AM technology has experienced considerable publicity and growth in the past few years with many successful insertions for non-mission-critical applications. However, to meet the full potential that AM has to offer, especially for flightcritical components (e.g., rotating parts, fracture-critical parts, etc.), qualification and certification efforts are necessary. While development of qualification standards will address some of these needs, this overview outlines some of the other key areas that will need to be considered in the qualification path, including various process-, microstructure-, and fracture-modeling activities in addition to integrating these with lifing activities targeting specific components. Ongoing work in the Advanced Manufacturing and Mechanical Reliability Center at Case Western Reserve University is focusing on fracture and fatigue testing to rapidly assess critical mechanical properties of some titanium alloys before and after post-processing, in addition to conducting nondestructive testing/evaluation using micro-computerized tomography at General Electric. Process mapping studies are being conducted at Carnegie Mellon University while large area microstructure characterization and informatics (EBSD and BSE) analyses are being conducted at Materials Resources LLC to enable future integration of these efforts via an Integrated Computational Materials Engineering approach to AM. Possible future pathways for materials qualification are provided.

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Section: Process Control and Process Mappingmentioning

confidence: 99%

Section: Microstructure and Defect Characterization/quantificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Overview of Materials Qualification Needs for Metal Additive Manufacturing

Seifi

Salem

Beuth

et al. 2016

JOM

Self Cite

485

183

View full text Add to dashboard Cite

show abstract

“…To date, no study on the fatigue crack growth on LMwD:ed Ti-6Al-4V is available in the literature to the authors knowledge. So far, only AM processes with powder used as feedstock material have been evaluated [12][13][14][15][16][17]. The main objective of the current work has been to characterize the crack profiles of fatigue crack growth fractured specimens, thereby increasing the understanding of the crack propagation behavior and the impact of microstructural features and crystallographic orientation on the crack path characteristics.…”

Section: Introductionmentioning

confidence: 99%

Electron backscatter diffraction characterization of fatigue crack growth in laser metal wire deposited Ti-6Al-4V

Åkerfeldt

Colliander

Pederson

et al. 2018

Materials Characterization

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By additive manufacturing (AM) there is a feasibility of producing near net shape components in basically one step from 3D CAD model to final product. The interest for AM is high and during the past decade a lot of research has been carried out in order to understand the influence from process parameters on the microstructure and furthermore on the mechanical properties. In the present study laser metal wire deposition of Ti-6Al-4V has been studied in detail with regard to its fatigue crack propagation characteristics. Two specimen orientations, parallel and perpendicular to the deposition direction, have been evaluated at room temperature and at 250°C. No difference in the fatigue crack growth rate could be confirmed for the two specimen orientations. However, in the fractographic study it was observed that the tortuosity varied between certain regions on the fracture surface. The local crack path characteristic could be related to the alpha colony size and/or the crystallographic orientation. Moreover, large areas exhibiting similar crystallographic orientation were observed along the prior beta grain boundaries, which were attributed to the wide alpha colonies frequently observed along the prior beta grain boundaries.

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Microstructure and Mechanical Properties of Ti‐48Al‐2Cr‐2Nb Manufactured Via Electron Beam Melting

Seifi¹,

Ghamarian²,

Samimi³

et al. 2016

Proceedings of the 13th World Conference on Titanium

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Titanium aluminide (TiAl) alloys have been studied for many years with the intent to replace heavier Ni-based superalloys currently used in aerospace structural parts. Various additive manufacturing techniques are being explored to produce near net shape components of TiAl and other materials. Due to the multiple cycles of heating and cooling at different rates, a complex microstructure evolution and resulting mechanical response is expected for materials made by these techniques. In this work, the microstructure of as-deposited Ti-48Al-2Cr-2Nb was documented at different length scales in addition to evaluating the fracture toughness and fatigue crack growth behavior.

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Evaluation of Orientation Dependence of Fracture Toughness and Fatigue Crack Propagation Behavior of As-Deposited ARCAM EBM Ti-6Al-4V

Cited by 96 publications

References 26 publications

Overview of Materials Qualification Needs for Metal Additive Manufacturing

Overview of Materials Qualification Needs for Metal Additive Manufacturing

Electron backscatter diffraction characterization of fatigue crack growth in laser metal wire deposited Ti-6Al-4V

Microstructure and Mechanical Properties of Ti‐48Al‐2Cr‐2Nb Manufactured Via Electron Beam Melting

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