Effects of altered hot isostatic pressing treatments on the microstructures and mechanical performance of electron beam melted Ti-6Al-4V

Abu-Issa, Ahmad; López, M.I.; Pickett, Christina; Escarcega, Andres; Arrieta, Edel; Murr, Lawrence E.; Wicker, Ryan B.; Ahlfors, Magnus; Godfrey, Don; Medina, Francisco

doi:10.1016/j.jmrt.2020.06.019

Cited by 24 publications

(8 citation statements)

References 16 publications

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“…The HIP-780 °C samples also exhibit smaller scatter of density, fatigue and mechanical properties as compared to the scatter of the as-built, HIP-920 °C samples ( Table 4 ), and the scatter in data of Tang et al [ 50 ], which may be attributed to its fine and homogeneous microstructure. It is worth noting that the mechanical properties attained after HIP at 780 °C in the current study, surpassed the mechanical properties of Ti64 fabricated recently by EBM and HIP’ed at their optimum condition, 850 °C and a pressure of 207 MPa [ 52 ].…”

Section: Discussionmentioning

confidence: 66%

Tailoring Microstructure and Mechanical Properties of Additively-Manufactured Ti6Al4V Using Post Processing

Ganor

Tiferet²,

Vogel

et al. 2021

Materials

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Additively-manufactured Ti-6Al-4V (Ti64) exhibits high strength but in some cases inferior elongation to those of conventionally manufactured materials. Post-processing of additively manufactured Ti64 components is investigated to modify the mechanical properties for specific applications while still utilizing the benefits of the additive manufacturing process. The mechanical properties and fatigue resistance of Ti64 samples made by electron beam melting were tested in the as-built state. Several heat treatments (up to 1000 °C) were performed to study their effect on the microstructure and mechanical properties. Phase content during heating was tested with high reliability by neutron diffraction at Los Alamos National Laboratory. Two different hot isostatic pressings (HIP) cycles were tested, one at low temperature (780 °C), the other is at the standard temperature (920 °C). The results show that lowering the HIP holding temperature retains the fine microstructure (~1% β phase) and the 0.2% proof stress of the as-built samples (1038 MPa), but gives rise to higher elongation (~14%) and better fatigue life. The material subjected to a higher HIP temperature had a coarser microstructure, more residual β phase (~2% difference), displayed slightly lower Vickers hardness (~15 HV10N), 0.2% proof stress (~60 MPa) and ultimate stresses (~40 MPa) than the material HIP’ed at 780 °C, but had superior elongation (~6%) and fatigue resistance. Heat treatment at 1000 °C entirely altered the microstructure (~7% β phase), yield elongation of 13.7% but decrease the 0.2% proof-stress to 927 MPa. The results of the HIP at 780 °C imply it would be beneficial to lower the standard ASTM HIP temperature for Ti6Al4V additively manufactured by electron beam melting.

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Section: Discussionmentioning

confidence: 66%

Tailoring Microstructure and Mechanical Properties of Additively-Manufactured Ti6Al4V Using Post Processing

Ganor

Tiferet²,

Vogel

et al. 2021

Materials

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“…The HIP process was carried out in a protective atmosphere of argon gas. The process parameters were selected on the basis of literature analysis for studies conducted using the HIP processing of Ti6Al4V [ 19 , 20 ] alloy, while at the same time taking into account differences in the onset temperatures of the recrystallization of the alloys.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Postprocessing on the Fatigue Properties of Ti-5Al-5Mo-5V-1Cr-1Fe Produced Using Electron Beam Melting

et al. 2023

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Despite the significant potential advantages of processing Ti-5Al-5Mo-5V-1Cr-1Fe alloy (Ti-55511) using Electron Beam Melting (PBF-EB/M), when compared to conventional manufacturing technologies, the resulting internal defects are an important characteristic of such additive technologies and can highly decrease mechanical properties. One of the most dangerous defects formed during metal additive manufacturing processes are material discontinuities such as a lack of fusion. Defects of this type, due to their “flat” nature, are difficult to characterize. For cycle-loaded specimens, where the loading force acts perpendicular to the lack-of-fusion plane, defects of this type can significantly reduce fatigue properties. This paper presents the results of research aimed at improving the fatigue properties of Ti55511 alloy by reducing the influence of the lack-of-fusion defect on fatigue damage. The static and fatigue properties of specimens in the as-built state, as well as after hot isostatic pressing (HIP) treatment, were analyzed. The effect of HIP on both the reduction of pores and the degree of sphericity when using the X-ray computed tomography (XCT) system was presented. The change in the microstructure after HIP was analyzed in terms of the change in the size of individual phases, as well as the change in the phase ratio. This paper also contains a fractographic analysis of the samples after tensile and fatigue tests.

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“…On the other hand, the fatigue performance of EBM manufactured Ti6Al4V is typically inferior [27] , but can be improved significantly by post treatments. Hot isostatic pressing reduces porosity [28] , allows manipulation of microstructure to achieve equiaxed grains to ensure isotropic mechanical properties [29] , and improve mechanical properties, including ductility (elongation to failure) and fatigue behaviour [30] . Subsequent surface treatments such as centrifugal finishing, linishing, shot peening, and laser shock peening can fur-ther improve the fatigue strength [31] .…”

Section: Powder Bed Fusion Based Metal Additive Manufacturingmentioning

confidence: 99%

Complex geometry and integrated macro-porosity: Clinical applications of electron beam melting to fabricate bespoke bone-anchored implants

Palmquist

Jolic²,

Hryha³

et al. 2023

Acta Biomaterialia

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Effects of altered hot isostatic pressing treatments on the microstructures and mechanical performance of electron beam melted Ti-6Al-4V

Cited by 24 publications

References 16 publications

Tailoring Microstructure and Mechanical Properties of Additively-Manufactured Ti6Al4V Using Post Processing

Tailoring Microstructure and Mechanical Properties of Additively-Manufactured Ti6Al4V Using Post Processing

The Effect of Postprocessing on the Fatigue Properties of Ti-5Al-5Mo-5V-1Cr-1Fe Produced Using Electron Beam Melting

Complex geometry and integrated macro-porosity: Clinical applications of electron beam melting to fabricate bespoke bone-anchored implants

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