Advancement in the Pressureless Sintering of CP Titanium Using High-Frequency Induction Heating

Raynova, Stiliana Rousseva; Collas, Yan; Yang, Fei; Bolzoni, Leandro

doi:10.1007/s11661-019-05381-z

Cited by 33 publications

(9 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 2 shows the results of the microstructural analysis performed on the Ti–xMn–xNb alloys. Regardless of the chemical composition, a small amount of residual porosity is present in the microstructure, which is typical for powder metallurgy Ti alloys 27 , 28 . The majority of the pores are isolated, they have either spherical or elongated morphology, they are primarily located at the boundaries between phases, and their volumetric fraction slightly increases with the amount of alloying elements added.…”

Section: Resultsmentioning

confidence: 99%

New ternary powder metallurgy Ti alloys via eutectoid and isomorphous beta stabilisers additions

Paul

Alshammari

Yang

et al. 2023

Sci Rep

View full text Add to dashboard Cite

A group of new ternary Ti alloys bearing eutectoid and isomorphous beta stabilising elements was created to be manufactured through the conventional powder metallurgy route. The effect of the simultaneous addition of the same amount of Mn and Nb on the manufacturability, properties, and hardening behaviour was investigated. The ternary alloys are composed of the α-Ti and β-Ti phases and have a lamellar microstructure resulting from the slow cooling upon sintering. However, the size of the equiaxed α grains and of the α + β lamellae is monotonically reduced, especially the interlamellar spacing, as the amount of alloying elements increases. Due to their physical properties, Mn enhances and Nb hinders densification during sintering resulting in a decreasing trend of the relative density with the alloying elements content. Consequently, the resistance to plastic deformation increases (UTS, 514–726 MPa), the ductility decreases (elongation, 13.2–2.6%), and the fracture mode changes from intergranular to transgranular. The new ternary alloys share the same hardening mechanism, but the amount of deformation after necking is, generally, higher for lower amounts of Mn and Nb.

show abstract

Section: Resultsmentioning

confidence: 99%

New ternary powder metallurgy Ti alloys via eutectoid and isomorphous beta stabilisers additions

Paul

Alshammari

Yang

et al. 2023

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Nevertheless, further induction sintering provides similar densification results compared to furnace sintering, [33] but in a significantly shorter time. Raynova et al [34] studied the impact of the green density on densification during induction sintering. It has been revealed that with increasing green compact density, the increment of the density during sintering decreased significantly.…”

Section: A Effect Of Initial Materials and Sintering Conditions On Thmentioning

confidence: 99%

“…Similar values were previously reported for induction sintering of commercially pure (CP) titanium powder or mixtures of elemental powders based on titanium consolidated in comparable conditions. [11,25,34]…”

Section: A Effect Of Initial Materials and Sintering Conditions On Thmentioning

confidence: 99%

“…The application of induction heating significantly increases the heating rates, which causes rapid thermal expansion, accelerates the necking formation and leads to a reduction of the sintering time. [34] Increasing the sintering temperature also has a beneficial influence on the material diffusion process. It has been previously reported that sintering above the b-transus temperature enhanced the self-diffusion of the titanium as well as aluminum, where its diffusion coefficient in b-Ti increased when increasing the temperature.…”

Section: B Microstructural Analysis Of As-sintered Materialsmentioning

confidence: 99%

See 1 more Smart Citation

The Influence of Induction Sintering on Microstructure and Deformation Behavior of Ti-5Al-5Mo-5V-3Cr Alloy

Zyguła

Wojtaszek

Śleboda

et al. 2021

Metall Mater Trans A

View full text Add to dashboard Cite

The influence of the induction sintering process at different temperatures on the behavior of the powder metallurgy Ti-5Al-5Mo-5V-3Cr alloy was investigated. Material for the research was produced by elemental powder blending, followed by the uniaxial cold compacting process. Powder compacts were induction heated and sintered within the temperature range of 1000 °C to 1300 °C. The influences of process parameters on the material behavior during sintering and its properties were studied. The microstructure examination was performed with particular attention to the pore size and distribution as well as the homogenization of the microstructure. The sintering temperature of 1200 °C proved to be critical for the dissolution of most alloying powder particles. Hot compression tests were performed to determine the formability of the obtained material. Significant differences in flow stress behavior between samples sintered at temperatures below and above 1200 °C were observed. The mechanical properties of the material before and after deformation were compared. The evolution of the microstructure of sintered Ti-5Al-5Mo-5V-3Cr alloy after hot deformation was analyzed with an emphasis on its influence on the material properties. Based on the conducted research, it was found that the adequate homogenization of the chemical composition and microstructure was achieved at the temperature of 1250 °C, and a further increase did not reflect in a significant improvement.

show abstract

“…The solid-state sintering of powder compacts results from the reduced surface energy of particles in close proximity, whereby mass transport diffusion takes place, with the most common approach performed through solid-state furnace sintering [ 35 ]. Other highly effective routes have been developed more recently, such as microwave sintering [ 36 , 37 ], Spark Plasma Sintering (SPS) or Field-Assisted Sintering (FAST) [ 38 ], or via direct [ 39 , 40 , 41 ] or indirect [ 42 , 43 ] induction. An advantage of microwave, SPS/FAST, and induction sintering, in contrast to conventional sintering, is the capability to sinter in only a few minutes rather than hours or days [ 36 , 38 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

Indirect Induction Sintering of Metal Parts Produced through Material Extrusion Additive Manufacturing

et al. 2023

View full text Add to dashboard Cite

Avoiding loose powders and resins, material extrusion additive manufacturing is a powerful technique to produce near-net shape parts, being a cheap and safe alternative for developing complex industrial-grade products. Filaments embedded with a high packing density of metallic or ceramic granules are being increasingly used, resulting in almost fully dense parts, whereby geometries are shaped, debinded and sintered sequentially until the completion of the part. Traditionally, “brown” debinded geometries are transported to conventional furnaces to densify the powder compacts, requiring careful tailoring of the heating profiles and sintering environment. This approach is decoupled and often involves time-consuming post-processing, whereby after the completion of the shaping and debinding steps, the parts need to be transported to a sintering furnace. Here, it is shown that sintering via indirect induction heating of a highly filled commercially available filament embedded with stainless steel 316L powder can be an effective route to densify Fused Filament Fabricated (FFF) parts. The results show that densities of 99.8% can be reached with very short soaking times, representing a significant improvement compared to prior methods. A hybrid machine is proposed, whereby a custom-built machine is integrated with an induction heater to combine FFF with local indirect induction sintering. Sintering in situ, without the need for part transportation, simplifies the processing of metal parts produced through material extrusion additive manufacturing.

show abstract

Advancement in the Pressureless Sintering of CP Titanium Using High-Frequency Induction Heating

Cited by 33 publications

References 24 publications

New ternary powder metallurgy Ti alloys via eutectoid and isomorphous beta stabilisers additions

New ternary powder metallurgy Ti alloys via eutectoid and isomorphous beta stabilisers additions

The Influence of Induction Sintering on Microstructure and Deformation Behavior of Ti-5Al-5Mo-5V-3Cr Alloy

Indirect Induction Sintering of Metal Parts Produced through Material Extrusion Additive Manufacturing

Contact Info

Product

Resources

About