Oxide dispersion strengthening of γ-TiAl by laser additive manufacturing

Rittinghaus, Silja‐Katharina; Wilms, Markus Benjamin

doi:10.1016/j.jallcom.2019.07.024

Cited by 24 publications

(9 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In titanium aluminides, dispersion hardening by using oxide particles could be effective due to their hardness, stability and modulus. Few literature data are available for Al 2 O 3 dispersion hardened TiAl alloys, in particular there is a paper [20] that describes the production of these alloys by means of additive manufacturing but results of mechanical tests have not been reported. Another research described the production of Al 2 O 3 particle reinforced TiAl composites from a powder mixture of Ti, Al, TiO 2 and Nb 2 O 5 , using the hot-pressing reaction synthesis technique [21].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behaviour of an Al2O3 Dispersion Strengthened γTiAl Alloy Produced by Centrifugal Casting

Pilone

Pulci

Paglia

et al. 2020

Metals

View full text Add to dashboard Cite

γ-TiAl has been a hot topic of research for more than a few decades now, since it is a potential candidate for high temperature structural applications. In this paper, dispersion strengthening of γ based TiAl alloy, produced by means of centrifugal casting, has been performed to increase its mechanical properties beyond those of standard TiAl alloys. After a careful selection of the alloy composition based on the desired properties, several samples were produced by means of investment casting. This work focused on the effect of Al2O3 nano- and micro-dispersoids on the mechanical properties of the considered TiAl alloy. Microstructural investigations were carried out to study both the alloy microstructure and the Al2O3 dispersion homogeneity. Samples of the produced alloy were subjected to four-point bending tests at different temperatures for evaluating the effect of dispersed particles on mechanical properties. The results of this study were promising and showed that Al2O3 dispersion determined an increase of the mechanical properties at high temperatures. The Young’s modulus was 30% higher than that of the reference alloy in the lower temperature range. Over the temperature range 800–950 °C the dispersion strengthening affected the yield stress by increasing its value of about 20% even at 800 °C. A detailed evaluation of fracture surfaces was carried out to investigate fracture mechanisms.

show abstract

Section: Introductionmentioning

confidence: 99%

Mechanical Behaviour of an Al2O3 Dispersion Strengthened γTiAl Alloy Produced by Centrifugal Casting

Pilone

Pulci

Paglia

et al. 2020

Metals

View full text Add to dashboard Cite

show abstract

“…An approach utilizing laser-processed powder material containing the metallic and ceramic components of the alloy as a feedstock also has been demonstrated. [25][26][27][28] For the LAM process of directed energy deposition (DED), also referred to as laser metal deposition (LMD), general feasibility has been demonstrated using mechanically alloyed powder material [29][30][31]. However, pronounced agglomeration and clustering of oxide nanoparticles in DED-manufactured material are observed [32,33], resulting in the dispersion of agglomerated oxide dispersoids with reduced number densities compared to L-PBF processed material.…”

Section: Introductionmentioning

confidence: 99%

“…However, pronounced agglomeration and clustering of oxide nanoparticles in DED-manufactured material are observed [32,33], resulting in the dispersion of agglomerated oxide dispersoids with reduced number densities compared to L-PBF processed material. [27] The agglomeration tendencies are attributed to reduced solidification and cooling rates, which stem from larger beam diameters and lower process velocities used in DED processes compared to L-PBF processes [27] or the utility of additional preheating [29,34].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Manufacturing oxide-dispersion-strengthened steels using the advanced directed energy deposition process of high-speed laser cladding

2022

Self Cite

View full text Add to dashboard Cite

In this work, we demonstrate the feasibility of manufacturing an iron-based oxide-dispersion-strengthened (ODS) PM2000 composite material with the chemical composition of Fe20Cr4.5Al0.5Ti + 0.5Y2O3 (in wt.%) via the advanced directed energy deposition (DED) process of high-speed laser cladding (HSLC). The characteristic high solidification rates of HSLC processes allow the successful dispersion of nano-scaled yttrium-based oxides in the ferritic stainless steel matrix. The effective suppression of nano-particle agglomeration during the melting stage, which is frequently observed in conventional DED processes of ODS materials, is reflected by smaller dispersoid sizes and corresponding higher hardness of manufactured specimen compared to DED-manufactured counterparts.

show abstract

“…Oxide dispersion strengthening (ODS) is known to increase the materials strength especially at high temperatures and improve creep behavior. The feasibility to apply ODS in additive manufacturing of Fe-, Ni-, Ti-based and y-TiAl alloys and the positive effect on mechanical properties has been demonstrated for various material systems [19][20][21][22][23][24]. It leads to increased hardness and strength.…”

Section: Introductionmentioning

confidence: 99%

Laser Additive Manufacturing of Intermetallic Alloys for High-Temperature Applications

Rittinghaus¹,

Schmelzer²,

Wilms³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Intermetallic alloys like e.g. Iron-Aluminides, Titanium-Aluminides or Molybdenum- Silizides are prospective materials for high-temperature applications. For additive manufacturing (AM) intermetallic structural materials are particularly challenging due to their high melting points, oxygen susceptibility and low temperature brittleness. The feasibility of manufacturing intermetallic Mo-Si-B alloys with the laser additive manufacturing process of direct energy deposition (DED) is demonstrated and recent results in characterizing rapidly solidified material with respect to correlations between process, composition and microstructures are presented. The possibility to dope the material with Yttrium oxide (Y2O3) for dispersion is successfully demonstrated. Current challenges, e.g. homogenous distribution of alloying elements and applicability are addressed.

show abstract

Oxide dispersion strengthening of γ-TiAl by laser additive manufacturing

Cited by 24 publications

References 16 publications

Mechanical Behaviour of an Al2O3 Dispersion Strengthened γTiAl Alloy Produced by Centrifugal Casting

Mechanical Behaviour of an Al2O3 Dispersion Strengthened γTiAl Alloy Produced by Centrifugal Casting

Manufacturing oxide-dispersion-strengthened steels using the advanced directed energy deposition process of high-speed laser cladding

Laser Additive Manufacturing of Intermetallic Alloys for High-Temperature Applications

Contact Info

Product

Resources

About