Influence of microstructure on mechanical properties of laser metal wire-deposited Ti-6Al-4V

Åkerfeldt, Pia; Antti, Marta‐Lena; Pederson, Robert

doi:10.1016/j.msea.2016.07.038

Cited by 148 publications

(73 citation statements)

References 20 publications

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“…In addition, areas with wide colony alpha are frequently observed next to the prior beta grain boundary. Regarding possible influence of specimen location (in the built wall) on microstructure for AM:ed material, no variation has been observed in this and previous studies on the same walls [9,10]. …”

Section: Microstructural Characterizationcontrasting

confidence: 60%

“…The material characterized in the current study was manufactured using laser metal wire deposition (LMwD) and comes from the same walls as in [9,10]. In the LMwD process a robotized fiber laser cell melts a metal wire layer by layer forming the wanted shape, which in this case was so called "walls".…”

Section: Methodsmentioning

confidence: 99%

“…In LMwD a laser heat source melts a metal wire into the wanted shape and it is in general an attractive AM process for larger structures in which a higher deposition rate is advantageous [3,4]. As for many other AM processes, the LMwD:ed Ti-6Al-4V exhibits anisotropic mechanical properties that vary depending on the specimen orientation within the built material [5,6]. In previous work, the tensile [6,10] and the low cycle fatigue [9] properties have been evaluated with respect to two specimen orientations.…”

Section: Introductionmentioning

confidence: 99%

“…As for many other AM processes, the LMwD:ed Ti-6Al-4V exhibits anisotropic mechanical properties that vary depending on the specimen orientation within the built material [5,6]. In previous work, the tensile [6,10] and the low cycle fatigue [9] properties have been evaluated with respect to two specimen orientations. This anisotropy could be related to several parameters such as grain boundary alpha [7,8] and prevalence of defects [9].…”

Section: Introductionmentioning

confidence: 99%

“…This anisotropy could be related to several parameters such as grain boundary alpha [7,8] and prevalence of defects [9]. Moreover, the building process renders large columnar prior beta grains because of a preferential dendritic growth during solidification in the beta phase, thus from a macroscopic perspective the prior beta grains could also be related to the anisotropic properties [10].…”

Section: Introductionmentioning

confidence: 99%

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

Åkerfeldt

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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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Section: Microstructural Characterizationcontrasting

confidence: 60%

Section: Methodsmentioning

confidence: 99%