Selective laser melting of titanium parts: Influence of laser process parameters on macro- and microstructures and tensile property

Sun, Dongsheng; Gu, Dongdong; Lin, Kaijie; Ma, Ji; Chen, Wenhua; Huang, Jie; Sun, Xiaofeng; Chu, May

doi:10.1016/j.powtec.2018.09.090

Cited by 100 publications

(42 citation statements)

References 37 publications

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“…However, the current results still prove the insufficiency of the input laser energy in the original C1 samples. The study by Sun et al [50] suggests that Ti-6Al-4V samples possess high density when manufactured using high laser power and low scanning speeds. This statement holds for C1 samples manufactured using a range of process parameters ( Figure 3).…”

Section: Influence Of Size On Density Microstructure and Hardness Omentioning

confidence: 99%

The Effects of Feature Sizes in Selectively Laser Melted Ti-6Al-4V Parts on the Validity of Optimised Process Parameters

et al. 2019

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Ti-6Al-4V is a popular alloy due to its high strength-to-weight ratio and excellent corrosion resistance. Many applications of additively manufactured Ti-6Al-4V using selective laser melting (SLM) have reached technology readiness. However, issues linked with metallurgical differences in parts manufactured by conventional processes and SLM persist. Very few studies have focused on relating the process parameters to the macroscopic and microscopic properties of parts with different size features. Therefore, the aim of this study was to investigate the effect of the size of features on the density, hardness, microstructural evolution, and mechanical properties of Ti-6Al-4V parts fabricated using a fixed set of parameters. It was found that there is an acceptable range of sizes that can be produced using a fixed set of parameters. Beyond a specific window, the relative density decreased. Upon decreasing the size of a cuboid from (5 × 5 × 5 mm) to (1 × 1 × 5 mm), porosity increased from 0.3% to 4.8%. Within a suitable size range, the microstructure was not significantly affected by size; however, a major change was observed outside the acceptable size window. The size of features played a significant role in the variation of mechanical properties. Under tensile loading, decreasing the gauge size, the ultimate and yield strengths deteriorated. This investigation, therefore, presents an understanding of the correlation between the feature size and process parameters in terms of the microscopic and macroscopic properties of Ti-6Al-4V parts manufactured using SLM. This study also highlights the fact that any set of optimized process parameters will only be valid within a specific size window.

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Section: Influence Of Size On Density Microstructure and Hardness Omentioning

confidence: 99%

The Effects of Feature Sizes in Selectively Laser Melted Ti-6Al-4V Parts on the Validity of Optimised Process Parameters

et al. 2019

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“…Being a fusion process, DLD generates an as-built microstructure resembling a cast structure. [124] Inconel 718: The microstructure of conventionally cast Inconel 718 consists of large γ-Ni grains with needle-shaped inter-and intragranular δ-Ni 3 Nb, MC carbides, laves phase, and γ 00 -Ni 3 Nb age-hardening precipitates. [118] Similarly with an SLM process, the martensite α' structure was observed, having a reduced plate width with an increased scan speed as shown in Figure 15.…”

Section: Microstructure Of Am Alloysmentioning

confidence: 99%

Laser‐Based Additive Manufacturing Technologies for Aerospace Applications

2019

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Additive manufacturing (AM) is a transformative technology that has rapidly grown over the past decade. AM processes build parts layer by layer and have found applications in the aerospace, biomedical, and automotive fields. The technology holds particular promise for the aerospace industry due to the reduced process time, weight savings of parts, and opportunities for new material development. Herein, a review of laser-based AM processes, existing AM systems, and aerospace parts being fabricated is presented. It further explores the material properties and microstructure of printed samples with both powder bed fusion and direct energy deposition processes. The benefits and challenges associated with the widespread use of the technology are discussed with emphases on the aerospace sector. Finally, the steps required for parts produced by AM processes to become certified for use in aerospace applications are presented.

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“…High mechanical properties of elements made of alloy Ti6Al4V using the SLM technology result primarily from structural transformations occurring in the material during melting followed by very fast cooling. The obtained non-equilibrium martensitic structure α' is characterised by high tensile strength and low elongation [21].…”

Section: Alloy Ti6al4vmentioning

confidence: 99%