4.5 Article

Tensile and Creep Properties Improvement of Ti-6Al-4V Alloy Specimens Produced by Electron Beam Powder Bed Fusion Additive Manufacturing

期刊

METALS
卷 9, 期 11, 页码 -

出版社

MDPI
DOI: 10.3390/met9111207

关键词

Ti-6Al-4V ELI alloy; electron beam powder bed fusion (EB-PBF); hot isostatic pressing (HIP); surface conditions; microstructure; mechanical properties

资金

  1. University of Catania within the project Piano della Ricerca Dipartimentale 2016-2018 of the Department of Civil Engineering and Architecture

向作者/读者索取更多资源

Thanks to their excellent mechanical strength in combination with low density, high melting point, and good resistance to corrosion, titanium alloys are very useful in many industrial and biomedical fields. The new additive manufacturing methods, such as Electron Beam Powder Bed Fusion based on the deposition of metal powders layers progressively molten by electron beam scanning, can overcome many of the machining problems concerning the production of peculiar shapes made of Ti alloys. However, the processing route is strictly determinant for mechanical performance of products, especially in the case of Ti alloys. In the present work flat specimens made of Ti-6Al-4V alloy produced by Electron Beam Powder Bed Fusion (or Electron Beam Melting) have been built and post-processed with the purpose of obtaining good tensile and creep performance. Preliminarily, the process parameters were set according to literature evidence and machine producer recommendations, validated by the results of a thermal analysis, aimed at satisfying the best processing conditions to reduce defects, as unmelted regions, microstructure coarsening or porosity, that are detrimental to mechanical behavior. Subsequently, Hot Isostatic Pressing and surface smoothing were considered, respectively, in order to reduce any internal porosity and lower roughness. Microstructure of the investigated specimens was characterized by optical and scanning electron microscopy observations and by X-ray diffraction measurements. Results show enhanced tensile behavior after the hot pressing treatment that allows to relieve stresses and reduce defects detrimental to mechanical properties. The best ductility was obtained by the combined effects of machining and densification. Creep test results verify the beneficial effects of surface smoothing.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.5
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

Article Automation & Control Systems

Parameterized multipoint-line analytical modeling of a mobile heat source for thermal field prediction in laser beam welding

Fabio Giudice, Severino Missori, Andrea Sili

Summary: This study introduces a multipoint-line thermal source model based on heat conduction to simulate the thermal effects of keyhole full penetration welding mode from high-power CO2 laser. The proposed model aims to simplify the selection of optimal process conditions.

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY (2021)

Article Green & Sustainable Science & Technology

A Design for Additive Manufacturing approach based on process energy ef fi ciency: Electron beam melted components

Fabio Giudice, Raffaele Barbagallo, Giovanna Fargione

Summary: This paper introduces a new Design for Additive Manufacturing approach, which evaluates the energy efficiency of different design solutions for the additive process through an energy consumption model and the concept of building energy. By detailing an energy consumption model for Electron Beam Melting technology and examining the energy consumption differences in manufacturing components of different shape classes, the study offers guidance for designers in effective improvement interventions.

JOURNAL OF CLEANER PRODUCTION (2021)

Article Chemistry, Multidisciplinary

Weld Metal Microstructure Prediction in Laser Beam Welding of Austenitic Stainless Steel

Fabio Giudice, Andrea Sili

Summary: The proposed modeling of the thermal field allows evaluation of fusion zone composition and solidification mode to aid in selecting optimal welding parameters and preventing hot cracking. An analytical method is used to predict weld metal microstructure based on the thermal fields generated during laser beam travel on thick plates, focusing on avoiding hot cracking by predicting molten zone microstructure.

APPLIED SCIENCES-BASEL (2021)

Article Materials Science, Multidisciplinary

Correlation Modeling between Morphology and Compression Behavior of Closed-Cell Al Foams Based on X-ray Computed Tomography Observations

Girolamo Costanza, Fabio Giudice, Andrea Sili, Maria Elisa Tata

Summary: Researchers developed a predictive analytical model for the compressive behavior of closed-cell Al foams based on the correlation between cellular morphology and mechanical response, successfully simulating the entire compression stress-strain curve.

METALS (2021)

Article Engineering, Multidisciplinary

An experimentally-based procedure for residual life assessment of steel radiant tubes

Fabio Giudice, Antonio Grasso, Eugenio Guglielmino, Andrea Sili

Summary: A calculation model is proposed to assess the combined effects of hot oxidation and creep damage on the residual life of radiant tubes used in topping furnaces of petrochemical plants. The model is effective in formulating hypotheses on the tubes actual thermal history and defining the range of operating conditions that guarantee a safe return to service. It can also predict the service life span of new tubes in ideal stable operating temperature, confirming the need for scheduling periodic checks to detect the actual condition of the tubes.

INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING (2022)

Article Polymer Science

Tribological behavior of biomedical grade UHMWPE with graphite-based fillers against EBM-Ti6Al4V pin under various lubricating conditions

Hossem Belhamdi, Benalia Kouini, Antonio Grasso, Cristina Scolaro, Andrea Sili, Annamaria Visco

Summary: In this study, the wear behavior of the mechanical coupling between UHMWPE and Ti6Al4V was investigated, and the addition of nanocomposite and paraffin oil was found to significantly improve the wear resistance.

JOURNAL OF APPLIED POLYMER SCIENCE (2022)

Article Engineering, Chemical

RBI-IOWs integrated approach to risk assessment: Methodological framework and application

Edoardo Arena, Giovanna Fargione, Fabio Giudice, Elisa Latona

Summary: The study aims to enhance the basic RBI approach by using IOWs analysis, offering a fully integrated dynamic risk-based methodological framework for inspection and maintenance departments to improve monitoring of critical plant parameters that could limit the reliability of pressure equipment during their life cycle.

JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES (2022)

Article Materials Science, Multidisciplinary

Experimental Investigation of the Tribological Contact between Ti6Al4V-EBM Pin and UHMWPE Rotating Sheet for Prosthetic Applications

Annamaria Visco, Fabio Giudice, Eugenio Guglielmino, Cristina Scolaro, Andrea Sili

Summary: This study focused on the tribological contact between a titanium-aluminum-vanadium alloy pin and a sheet of ultra high molecular weight polyethylene. Tribometric tests revealed the specific wear rate under different lubrication conditions, and observed a compressive effect on the pin tip during the test campaign.

METALS (2022)

Article Automation & Control Systems

A theoretical approach to the residual stress assessment based on thermal field evaluation in laser beam welding

Fabio Giudice, Andrea Sili

Summary: This paper presents a theoretical approach for predicting the distribution of residual stresses in welded parts using a parameterized multi-source model. The method uses analytical calculations based on the thermal field to analyze the longitudinal distribution of residual stresses. The approach is validated using the keyhole full penetration welding mode.

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY (2022)

Article Chemistry, Multidisciplinary

Wear Effect on the Contact between a Metallic Pin and a Rotating Polymeric Specimen

Annamaria Visco, Gabriella Epasto, Fabio Giudice, Cristina Scolaro, Andrea Sili

Summary: Debris formation is crucial for determining the lifespan of prosthetic joints. Potential errors can arise when measuring mass loss due to small values involved and absorption of humidity in the specimen. Accurate cleaning and drying processes can minimize these errors.

APPLIED SCIENCES-BASEL (2023)

暂无数据