Optimizing HIP and Printing Parameters for EBM Ti-6Al-4V

Eklúnd, Anders; Ahlfors, Magnus; Bahbou, Fouzi; Wedenstrand, Jouni

doi:10.4028/www.scientific.net/kem.770.174

Cited by 13 publications

(3 citation statements)

References 3 publications

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“…In accordance with literature data for specimens having the longitudinal section coplanar to the process plane [22,45,61], the strength after hot isostatic pressing is slightly decreased, while the elongation is increased (Figure 20). These results confirm the known effects on strength and ductility attributed to the HIP process [62,63]. Such as any heat treatment at high temperature for a significantly long time, hot pressing coarsens the microstructure (with particular regard to α phase, as evidenced by metallographic investigation reported previously), and to this is attributed the reduction of strength properties.…”

Section: Mechanical Propertiessupporting

confidence: 89%

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

Aliprandi

Giudice

Guglielmino

et al. 2019

Metals

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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.

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Section: Mechanical Propertiessupporting

confidence: 89%

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

Aliprandi

Giudice

Guglielmino

et al. 2019

Metals

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show abstract

“…Lowering the HIP treatment temperature to 800 °C and increasing the pressure to 200 MPa has proven to close the pores with less impact on the yield strength [ 26 ]. Earlier work on the high-temperature behavior of conventional Ti-6Al-4V has shown a 35% reduction in yield strength around the maximum operating temperature of 300 °C [ 12 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Elevated-Temperature Tensile Properties of Low-Temperature HIP-Treated EBM-Built Ti-6Al-4V

Pandian

Neikter

Bahbou³

et al. 2022

Materials

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Evaluation of the high-temperature tensile properties of Ti-6Al-4V manufactured by electron beam melting (EBM) and subjected to a low-temperature hot isostatic pressing (HIP) treatment (800 °C) was performed in this study. The high-temperature tensile properties of as-built and standard HIP-treated (920 °C) materials were studied for comparison. Metallurgical characterization of the as-built, HIP-treated materials was carried out to understand the effect of temperature on the microstructure. As the HIP treatments were performed below the β-transus temperature (995 °C for Ti-6Al-4V), no significant difference was observed in β grain width between the as-built and HIP-treated samples. The standard HIP-treated material measured about 1.4×–1.7× wider α laths than those in the modified HIP (low-temperature HIP)-treated and as-built samples. The standard HIP-treated material showed about a 10–14% lower yield strength than other tested materials. At 350 °C, the yield strength decreased to about 65% compared to the room-temperature strength for all tested specimens. An increase in ductility was observed at 150 °C compared to that at room temperature, but the values decreased between 150 and 350 °C because of the activation of different slip systems.

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“…A norma ASTM F9224-14 (ASTM, 2014) determina os parâmetros de PIQ para componentes AM como: "Componentes de processo sob atmosfera inerte a não menos que 100 MPa na faixa de 895 a 955 o C; mantenha a temperatura selecionada dentro de ±15 o C por 180 ± 60 min, e esfrie sob atmosfera inerte abaixo de 425 o C." Eklund et al (2018) levaram em consideração as taxas de resfriamento e têmpera e estudou diferentes cenários. O resfriamento rápido permite novas possibilidades de tratamento térmico e têmpera rápida, quebrando completamente a estrutura de grãos colunares do material em uma estrutura de grãos homogênea e equiaxial.…”

Section: Processo De Prensagem Isostática a Quente (Piq)unclassified

Modelos de dano e efeitos de prensagem isostática a quente para liga Ti-6Al-4V fabricada por manufatura aditiva.

Yazdi

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Aos meus pais e minha amada esposa AGRADECIMENTOSAgradeço a Deus pelo dom da vida. Gostaria de agradecer ao meu orientador, Prof. Dr. Marcílio Alves, pela orientação, paciência e apoio constante. A sua expertise e as conversas construtivas foram fundamentais ao longo deste trabalho. Grato pela contribuição acadêmica e inspiração como ser humano.Aos professores da Universidade de São Paulo, em especial, a professora Dra. Larissa Driemeier, pelo seu tempo e partilha de conhecimento nas conversas e por me atender para discutir assuntos relacionados a este trabalho. Aos colegas e amigos do Grupo Mecânica dos Sólidos e Impacto em Estruturas (GMSIE), principalmente ao Dr. Pouria Bahrami pela sua amizade, discussões e colaborações. Também agradeço ao Dr. Mohammad Moharami e ao Dr. Rahim Shoughi pela parceria e contribuições no período que estiveram na USP.Agradeço às instituições USP e Centro de Tecnologia da Informação Renato Archer (CTI) e seus colaboradores pela infraestrutura e fornecimento de material e à CAPES pela bolsa de estudo, viabilizando esta pesquisa. Suas contribuições foram essenciais para a realização deste estudo.Olhando a minha trajetória, não posso deixar de agradecer ao Brasil, seu povo e todos os professores e amigos pelo acolhimento e a contribuição na minha formação nas melhores universidades públicas do país. Espero poder contribuir de volta com esta sociedade.À minha família, quero expressar minha gratidão por seu amor, apoio e compreensão inabaláveis durante todo o processo de elaboração desta tese. Meu pai, Dr. Mohsen, pela inspiração, a minha mãe, Azam pelo carinho, a minha irmã, Dra. Zahra, pela motivação, a minha irmã, Hamideh, pela parceira e as minhas irmãs, Zeinab e Mahdieh, pela compreensão.Por fim, agradeço imensamente a minha amada esposa Hanieh pela sua paciência, companheirismo e suporte emocional e por me acompanhar em momentos difíceis desta jornada. "The noblest pleasure is the joy of understanding." Leonardo da VinciPalavras-chave: Manufatura aditiva, Ti-6Al-4V, Fusão por Feixe de Elétrons (EBM), Prensagem Isostática a Quente (PIQ), Modelo de dano, Método de elementos finitos.

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Optimizing HIP and Printing Parameters for EBM Ti-6Al-4V

Cited by 13 publications

References 3 publications

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

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

Elevated-Temperature Tensile Properties of Low-Temperature HIP-Treated EBM-Built Ti-6Al-4V

Modelos de dano e efeitos de prensagem isostática a quente para liga Ti-6Al-4V fabricada por manufatura aditiva.

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