Microstructure and mechanical properties of hierarchical porous parts of Ti-6Al-4V alloy obtained by powder bed fusion techniques

Sallica-Leva, Edwin; Costa, Fábio Edir dos Santos; Santos, Claudio Teodoro dos; Jardini, André Luiz; Silva, Jorge Vicente Lopes da; Fogagnolo, João Batista

doi:10.1108/rpj-04-2021-0078

Cited by 6 publications

(4 citation statements)

References 46 publications

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“…Further it is observed from the above study that the vertically built specimens were characterised by martensite needles, while the horizontally built specimens characterised by acicular structure (15) . At elevated temperature rise, Ti-6Al-4V exhibit one or two crystal structures alpha phase (α), a HCP structure often present at ambient temperature, the beta phase (β ), a BCC structure stable at high temperatures.…”

Section: Microstructural Analysismentioning

confidence: 60%

Evaluation of Micro Hardness and Wear Characteristics of Gyroid Designed Ti-6Al-4V Fabricated Through DMLS Technique

Devaraj,

Srinivasan

2024

IJST

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Objectives: To investigate the Micro Hardness, Micro structures and wear characteristics of the TPMS (Triply Periodic Minimal Surface) Gyroid structures with optimized porosity percentage for Bio medical application. Methods: Micro Hardness tester is used to find the micro hardness of the as cast Ti-6AL-4V and Gyroid Ti-6Al-4V Sample. Wear tests using pin-on-disc tribometer was used to assess the Gyroid Ti-6Al-4V wear samples for various loads and sliding velocity. The wear test parameters were test as load of 10, 30 & 50 N, with the sliding velocity of 0.5, 1.0 7 1.5 m/s. Atomic force microscope has been used for finding the surface roughness of the as cast and Gyroid Ti-6Al-4V samples before and after wear test. Findings: According to the test results. It is found that Gyroid Ti-6Al-4V samples posses more wear resistance than as cast Ti-6Al-4V. The micro hardness test results depicted clearly that, the Gyroid Ti-6Al-4V alloy posses' micro hardness of 408 HV in comparison with as cast Ti-6Al-4V alloys' hardness of 358 HV. The morphological characteristics of the worn-out samples were investigated using scanning electron microscope. At higher sliding conditions occurrence of large friction events lead to higher wear rates and the periodic localised fracture of transfer layer. At low sliding conditions, the Gyroid Ti-6Al-4V samples experienced ploughing, peeling off, plastic deformation types of wear mechanism. Novelty: The wear modes were categorised by the Fuzzy C-means algorithm, and a novel PNN tool in MATLAB created a wear map mechanism suitable for the Gyroid Ti alloy. The research conducted in this paper demonstrates a novel methodology for investigating wear mapping using a Probabilistic Neural Network on wear samples with a Gyroid lattice structure.

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Section: Microstructural Analysismentioning

confidence: 60%

Evaluation of Micro Hardness and Wear Characteristics of Gyroid Designed Ti-6Al-4V Fabricated Through DMLS Technique

Devaraj,

Srinivasan

2024

IJST

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“…The reason for this is that the graphite size around the square cylinder obtained from the composite material casting process is small, similar in length, and evenly distributed, resulting in an increase in the tensile strength of the thick wall and a small difference in the overall strength of the casting. In addition, there are some differences between the tensile strength test results of typical components and the strength values of finite element numerical simulation results, but it has no substantial impact on the test results [17,19,2,13,7]. This is because the performance parameters of the HT250 material used for pouring after inoculation treatment…”

Section: Mechanical Property Testing Of Square Cylindersmentioning

confidence: 99%

Numerical Simulation and Optimal Control of Composite Nonlinear Mechanical Parts Casting Process

Li,

Wang

2024

SCPE

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In order to understand the numerical simulation and optimal control of the casting process of Machine element, the author proposed a study based on the numerical simulation and optimal control of the casting process of composite Machine element. Firstly, the author analyzed the structural characteristics of composite Machine element, introduced them in detail, and studied their casting technology in combination with the actual situation. Secondly, the casting process of composite Machine element was simulated by using numerical simulation method, and the temperature field and flow field in the casting filling and solidification process were analyzed. Finally, selecting square cylinders with different wall thicknesses as typical components, the scheme design of traditional single casting process and multi material composite casting process based on dieless casting composite forming technology were carried out. Finite element numerical simulation and experimental research were conducted on the two processes, respectively. The results indicate that: The casting obtained by the multi material composite casting process almost solidifies simultaneously around 200 seconds later, and the graphite morphology around the casting is Type A, with a length of about 100 um, with small differences and uniform distribution; The minimum difference in tensile strength around the casting is about 3.8%, and the maximum increase in tensile strength value is 21%. This research achievement can provide technical reference for high-performance and high-quality casting of complex iron castings. In order to improve the casting quality, the author optimized the casting process of composite Machine element by numerical simulation.

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“…Titanium alloy (Ti-6Al-4V), due to its high strength, low density, excellent corrosion resistance, high temperature strength, and good weldability, is widely used as an important material in the fields of aerospace, biomedical, and chemical industries. [12][13][14][15][16][17] However, Ti-6Al-4V is susceptible to tribo-corrosion in harsh environments such as high temperature, high pressure, and chemical corrosion, leading to material failure and performance degradation. Therefore, to improve the tribo-corrosion performance of Ti-6Al-4V, in-depth research is needed on its microstructure and manufacturing processes.…”

Section: Introductionmentioning

confidence: 99%

Study on Morphology, Microstructure, and Tribo‐Corrosion Behavior of Laser‐Powder‐Bed‐Fusion‐Fabricated Titanium Alloy

Lu,

Wang,

2023

Adv Eng Mater

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The complicated interplay between microstructure and tribo‐corrosion behavior has long been an intriguing problem in the field of advanced materials engineering. This study systematically investigated the effects of different laser energy densities (LED) on the surface morphology, microstructure, and tribo‐corrosion behavior of Ti‐6Al‐4V produced using laser powder bed fusion (LPBF) technology. The surface morphology and microstructure of the specimens were characterized in detail using various characterization techniques such as optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD). Additionally, a self‐assembled friction‐corrosion equipment was employed to evaluate the tribo‐corrosion behavior of the samples at different LED settings. The results showed that the LED had a significant effect on the surface morphology, microstructure, and tribo‐corrosion behavior of the Ti‐6Al‐4V. Increasing the LED lead to reduced surface roughness, weakened keyhole and segregation phenomena, more distinct β grain boundaries, and coarser acicular α phase. Moreover, the tribo‐corrosion behavior initially improved and then declined with increasing LED. Furthermore, tribo‐corrosion product and mechanism of the Ti‐6Al‐4V alloy prepared by LPBF were revealed. This study is of great significance for understanding the relationship between the microstructure and tribo‐corrosion behavior of Ti‐6Al‐4V manufactured by LPBF.This article is protected by copyright. All rights reserved.

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Microstructure and mechanical properties of hierarchical porous parts of Ti-6Al-4V alloy obtained by powder bed fusion techniques

Cited by 6 publications

References 46 publications

Evaluation of Micro Hardness and Wear Characteristics of Gyroid Designed Ti-6Al-4V Fabricated Through DMLS Technique

Evaluation of Micro Hardness and Wear Characteristics of Gyroid Designed Ti-6Al-4V Fabricated Through DMLS Technique

Numerical Simulation and Optimal Control of Composite Nonlinear Mechanical Parts Casting Process

Study on Morphology, Microstructure, and Tribo‐Corrosion Behavior of Laser‐Powder‐Bed‐Fusion‐Fabricated Titanium Alloy

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