An investigation on the effect of different multi-step heat treatments on the microstructure, texture and mechanical properties of the DED-produced Ti-6Al-4V alloy

Carrozza, Alessandro; Aversa, Alberta; Mazzucato, Federico; Bassini, Emilio; Manfredi, Diego; Biamino, Sara; Valente, Anna; Fino, Paolo

doi:10.1016/j.matchar.2022.111958

Cited by 20 publications

(4 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In its as-built state, the tensile properties of Ti-6Al-4V alloy are generally superior to those of conventionally processed materials. However, this comes at the cost of reduced ductility, which remains a significant constraint regarding the alloy’s suitability for various applications [ 61 ].…”

Section: Studied Additive Technologiesmentioning

confidence: 99%

See 1 more Smart Citation

Additive Manufacturing Post-Processing Treatments, a Review with Emphasis on Mechanical Characteristics

et al. 2023

View full text Add to dashboard Cite

Additive manufacturing (AM) comes in various types of technologies and comparing it with traditional fabrication methods provides the possibility of producing complex geometric parts directly from Computer-Aided Designs (CAD). Despite answering challenges such as poor workability and the need for tooling, the anisotropy of AM constructions is the most serious issue encountered by their application in industry. In order to enhance the microstructure and functional behavior of additively fabricated samples, post-processing treatments have gained extensive attention. The aim of this research is to provide critical, comprehensive, and objective methods, parameters and results’ synthesis for post-processing treatments applied to AM builds obtained by 3D printing technologies. Different conditions for post-processing treatments adapted to AM processes were explored in this review, and demonstrated efficiency and quality enhancement of parts. Therefore, the collected results show that mechanical characteristics (stress state, bending stress, impact strength, hardness, fatigue) have undergone significant improvements for 3D composite polymers, copper-enhanced and aluminum-enhanced polymers, shape memory alloys, high-entropy alloys, and stainless steels. However, for obtaining a better mechanical performance, the research papers analyzed revealed the crucial role of related physical characteristics: crystallinity, viscosity, processability, dynamic stability, reactivity, heat deflection temperature, and microstructural structure.

show abstract

Section: Studied Additive Technologiesmentioning

confidence: 99%

“…In the experimental work [ 61 ], for DED-produced Ti-6Al-4V alloy, annealing treatments at 1050 °C followed by different cooling rates were conducted and the highest hardness was measured in the air cooled and aged specimens (11.5% greater than for the untreated samples).…”

Section: The Influence Of Post-processing Treatments On the Mechanica...mentioning

confidence: 99%

Additive Manufacturing Post-Processing Treatments, a Review with Emphasis on Mechanical Characteristics

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The ultrafast cooling rate and steep temperature gradient of L-DED induce exclusive coarse columnar grains, leading to undesirable anisotropy properties [ 12 , 13 , 14 , 15 ]. Moreover, the multiple thermal cycles easily promote the local precipitation or decomposition of the metastable phase, resulting in an inhomogeneous microstructure and properties [ 9 , 16 , 17 , 18 ]. The adjustment of processing parameters shows a limited effect on these microstructure defects, limiting the potential advantage of L-DED in fabricating high-performance titanium alloys.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Properties of Ti-Zr-Mo Alloys Fabricated by Laser Directed Energy Deposition

2023

View full text Add to dashboard Cite

The binary Ti-Zr congruent alloys have been a potential candidate for laser-directed energy deposition owing to an excellent combination of high structural stability and good formability. To solve its insufficient strength, a new series of Ti-Zr-Mo alloys with different Mo contents were designed based on a cluster model and then made by laser-directed energy deposition on a high-purity titanium substrate. The effect of Mo content on the microstructure and properties of the L-DEDed alloys was investigated. The consequences exhibit that the microstructure of all designed alloys is featured with near-equiaxed β grains without obvious texture. However, increasing Mo content induces a gradual refinement of the grain and a steady decrease in the lattice constant, which effectively improves the hardness, strength, wear and corrosion resistance of the designed alloys, but slightly weakens ductility and formability. From the viewpoint of both properties and forming quality, the Ti60.94Zr36.72Mo2.34 (at.%) alloy owns a proper match in mechanical, tribological, chemical, and forming properties, which is widely used in aeroengine components.

show abstract

“…The importance of studying the dissolution process of Ti in sulphuric acid was highlighted in the previous works [1][2][3][4][5][6] , regarding the complex electrochemical interface developing over the metal, as a result of the multitude possible valence states assumed by the metal cation and the formation of complexes from the coupling of Ti cations and S bearing anions. Titanium continues to deserve attention 7 as it is a strategic metal particularly employed, for example, in the aerospace industry where it comes in contact with sulphuric acid when airplanes flight in the troposphere and stratosphere 8 . This causes de-passivation to occur upon the reduction of its oxide layer, a process still far to be completely understood 9,10 .…”

mentioning

confidence: 99%

Investigating the activation of passive metals by a combined in-situ AFM and Raman spectroscopy system: a focus on titanium

Casanova

Menegazzo

Goto

et al. 2023

Sci Rep

View full text Add to dashboard Cite

Understanding the main steps involved in the activation of passive metals is an extremely important subject in the mechanical and energy industry and generally in surface science. The titanium-H2SO4 system is particularly useful for this purpose, as the metal can either passivate or corrode depending on potential. Although several studies tried to hypothesise the surface state of the electrode, there is no general consensus about the surface state of Ti in the active–passive transition region. Here by combining in-situ atomic force microscopy (AFM) and Raman spectroscopy, operating in an electrochemical cell, we show that the cathodic electrification of Ti electrodes causes the dissolution of the upper TiO2 portion of the passive film leaving the electrode covered by only a thin layer of titanium monoxide. Fast anodic reactions involved the acidification of the solution and accumulation of sulphur containing anions. This produces a local increase of the solution turbidity, allowing to distinguish favourable regions for the precipitation of TiOSO4·2H2O. These results give a clear answer to the long-stated question of the physical origin behind the formation of negative polarization resistances, sometimes occurring in corroding systems, and a rationale about the proton-induced degradation of passive surfaces in presence of sulphur containing species.

show abstract

An investigation on the effect of different multi-step heat treatments on the microstructure, texture and mechanical properties of the DED-produced Ti-6Al-4V alloy

Cited by 20 publications

References 40 publications

Additive Manufacturing Post-Processing Treatments, a Review with Emphasis on Mechanical Characteristics

Additive Manufacturing Post-Processing Treatments, a Review with Emphasis on Mechanical Characteristics

Microstructure and Properties of Ti-Zr-Mo Alloys Fabricated by Laser Directed Energy Deposition

Investigating the activation of passive metals by a combined in-situ AFM and Raman spectroscopy system: a focus on titanium

Contact Info

Product

Resources

About