Microstructural feature and mechanical property in different building directions of additive manufactured Ti6Al4V alloy

Chang, Kun; Liang, Enquan; Huang, Wenke; Zhang, Xi; Chen, Ying; Dong, Jianwei; Zhang, Ren

doi:10.1016/j.matlet.2020.127516

Cited by 40 publications

(20 citation statements)

References 16 publications

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“…Comparison of the obtained results with those presented in [ 6 , 7 , 8 , 9 , 10 ] indicates that they are consistent with the results achieved for the annealed Ti6Al4V material. High results compliance was obtained with the results presented in this work for all analyzed parameters, i.e., S y , S u , E, and A.…”

Section: Discussionsupporting

confidence: 89%

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Strain Analysis of Ti6Al4V Titanium Alloy Samples Using Digital Image Correlation

2020

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Digital image correlation (DIC) is a non-contact optical method that allows measuring displacements on a plane used to determine the strains caused by external loads of a structural element (mechanical or thermal). Currently, digital image correlation is a widely used experimental technique to assess the mechanical behavior of materials, in particular cracking characteristics and destruction methods of various structural elements. In this paper, the DIC method is applied to determine local strains of titanium alloy Ti6Al4V specimen. The samples used in the tests were made with two different technologies: (a) from a drawn bar by machining process; and (b) by the additive manufacturing method Direct Metal Laser Sintering (DMLS). The aim of the paper is to present the mechanical properties test results of the Ti6Al4V titanium alloy produced by the DMLS additive manufacturing under static loads using the digital image correlation method. As a result of the tests carried out on the drawn bar specimens, it was concluded that the change in the measurement base affects the difference in the Young’s E modulus value in the range from 89.2 to 103.8 GPa. However, for samples formed using the DMLS method, the change in the Young’s modulus value was from 112.9 to 115.3 GPa for the same measurement base.

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Section: Discussionsupporting

confidence: 89%

“…Chang et al [6] presented the research results of titanium alloy Ti6Al4V samples made by the means of the SLM additive technology. The annealing treatment, which was performed favorably, affected the tensile strength (S u = 953 MPa) and the elongation (A = 17.7%).…”

Section: Introductionmentioning

confidence: 99%

Strain Analysis of Ti6Al4V Titanium Alloy Samples Using Digital Image Correlation

2020

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“…Furthermore, SLM is famously known to process various metallic powders and their alloys [6]. Titanium alloy, Ti6Al4V (also abbreviated as Ti64), has properties that are promising for high-end structures; hence, it is regard best for biomedical and aerospace engineering applications [7]. Ti6Al4V can be manufactured with ease into artifact using conventional processes [2,3]; however, in recent years, the developments of using SLM to produce Ti6Al4V components have been a subject of interest [7].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Heat Treatment Parameters on Microstructure and Hardness Properties of High-Speed Selective Laser Melted Ti6Al4V

Lekoadi

Tlotleng

Annan

et al. 2021

Metals

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This study presents the investigation on how heat treatment parameters, which are temperature, cooling method, and residence time, influence the microstructural and hardness properties of Ti6Al4V components produced on Ti6Al4V substrate using high speed selective laser melting technique. Heat treatment was performed on the produced samples before they were characterized for microstructure and hardness. The microstructure of the as-built sample contained large columnar β-grains that were filled with martensite α’ phase and had a high hardness of 383 ± 13 HV. At 1000 °C and residence time of maximum 4 h, better heat treatment parameters were seen for the selective laser melting (SLM) produced Ti6Al4V sample since an improved lamellar α + β microstructure was obtained at this condition. This microstructure is known to have improved tensile properties.

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“…In 2019, Ren et al [ 24 ] set five gradients from 0–90° to study the effect of building orientation on the microstructure and mechanical properties of SLM Ti6Al4V, but there was a significant difference between the 0° sample and other samples in geometry, which would have a great impact on the reliability of the data. In 2020, Chang et al [ 25 ] and Xie et al [ 17 ] studied the effect of building orientation on the microstructure and mechanical properties of SLM Ti6Al4V, but they considered the horizontal and vertical directions only. In fact, for the horizontal building orientation, different surfaces of the sample in contact with the substrate will affect the heat transfer mode and efficiency during SLM, as shown in Figure 1 .…”

Section: Introductionmentioning

confidence: 99%

Multi-Perspective Analysis of Building Orientation Effects on Microstructure, Mechanical and Surface Properties of SLM Ti6Al4V with Specific Geometry

Cai

Song

et al. 2021

Materials

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Building orientation is important in selective laser melting (SLM) processes. Current studies only focus on the horizontal and vertical building orientations without considering different modes of horizontal orientations. In fact, for horizontal orientation, different surfaces of the sample that contact the substrate will affect the heat transfer mode and efficiency, and in turn affect the microstructure and material properties. In this paper, the effect of two modes of horizontal building orientations on microstructure, mechanical and surface properties of SLM Ti6Al4V was studied. Current research about building orientation is deficient because the geometry of samples or test surfaces are not strictly defined, which seriously influences the results due to their different heat transfer efficiency and mode. Therefore, the geometry of the samples and test surfaces were clearly defined, and its necessity was proved in this study. To achieve the research goal, three test samples were prepared: sample SLM-PB-S with the building orientation parallel to the substrate and the shorter side L1 contacts it, sample SLM-PB-L with the building orientation parallel to the substrate and the longer side L2 contacts it and sample SLM-VB with the building orientation vertical to the substrate. Subsequently, the microstructure, grain information, densification, residual stress, micro-hardness, tensile properties and surface topography of different samples were analyzed and compared. In the results, SLM-PB-S exhibited denser microstructure and better mechanical properties than SLM-PB-L, including smaller grain size, stronger texture, higher density, micro-hardness, tensile strength, plasticity and better surface quality. It originates from a higher cooling rate and shorter scanning time between layers during SLM-PB-S fabrication, leading to finer grains, lower porosity and better interlayer metallurgical bonding, thus resulting in better material properties. This study can provide a reference to select the proper building orientation in SLM.

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Microstructural feature and mechanical property in different building directions of additive manufactured Ti6Al4V alloy

Cited by 40 publications

References 16 publications

Strain Analysis of Ti6Al4V Titanium Alloy Samples Using Digital Image Correlation

Strain Analysis of Ti6Al4V Titanium Alloy Samples Using Digital Image Correlation

Evaluation of Heat Treatment Parameters on Microstructure and Hardness Properties of High-Speed Selective Laser Melted Ti6Al4V

Multi-Perspective Analysis of Building Orientation Effects on Microstructure, Mechanical and Surface Properties of SLM Ti6Al4V with Specific Geometry

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