Crack elimination and mechanical properties enhancement in additive manufactured Hastelloy X via in-situ chemical doping of Y2O3

Cheng, Xiaopeng; Zhao, Yanan; Qian, Zhu; Wu, Jin; Dong, Ji; Ma, Zongqing; Liu, Yongchang

doi:10.1016/j.msea.2021.141867

Cited by 40 publications

(3 citation statements)

References 45 publications

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“…(1) Grain refinement As shown in Fig. 9c, grain growth was inhibited after the addition of Si, and the refinement of grains can effectively increase the total surface area of grain boundaries, thus suppressing the generation of cracks and further improving the mechanical performance of the final parts [59], as described by Hall-Petch formula as follows [60]:…”

Section: Strengthening Mechanism In Al7075-5si Alloymentioning

confidence: 99%

Si-Assisted Solidification Path and Microstructure Control of 7075 Aluminum Alloy with Improved Mechanical Properties by Selective Laser Melting

Sha

Yang

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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The construction and application of traditional high-strength 7075 aluminum alloy (Al7075) through selective laser melting (SLM) are currently restricted by the serious hot cracking phenomenon. To address this critical issue, in this study, Si is employed to assist the SLM printing of high-strength Al7075. The laser energy density during SLM is optimized, and the effects of Si element on solidification path, relative density, microstructure and mechanical properties of Al7075 alloy are studied systematically. With the modified solidification path, laser energy density, and the dense microstructure with refined grain size and semi-continuous precipitates network at grain boundaries, which consists of fine Si, β-Mg 2 Si, Q-phase and θ-Al 2 Cu, the hot cracking phenomenon and mechanical properties are effectively improved. As a result, the tensile strength of the SLM-processed Si-modified Al7075 can reach 486 ± 3 MPa, with a high relative density of ~ 99.4%, a yield strength of 291 ± 8 MPa, fracture elongation of (6.4 ± 0.4)% and hardness of 162 ± 2 (HV 0.2 ) at the laser energy density of 112.5 J/ mm 3 . The main strengthening mechanism with Si modification is demonstrated to be the synergetic enhancement of grain refinement, solution strengthening, load transfer, and dislocation strengthening. This work will inspire more new design of high-strength alloys through SLM.

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Section: Strengthening Mechanism In Al7075-5si Alloymentioning

confidence: 99%

Si-Assisted Solidification Path and Microstructure Control of 7075 Aluminum Alloy with Improved Mechanical Properties by Selective Laser Melting

Sha

Yang

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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“…However, the study on liquid-based powder manufacturing methods applied in ODS Ni-based superalloys is scarely reported. [33] In this study, the LPBF technique is employed to fabricate a Y 2 O 3 containing ODS IN718 alloy. To deagglomerate Y 2 O 3 nanoparticles, an ED approach with dispersant added, which is called electrostatic self-assembly (ESA), [30] is utilized for powder preparation before LPBF.…”

Section: Introductionmentioning

confidence: 99%

“…However, the study on liquid‐based powder manufacturing methods applied in ODS Ni‐based superalloys is scarely reported. [ 33 ]…”

Section: Introductionmentioning

confidence: 99%

Unique Yttria Nanoparticle Strengthening in an Inconel 718 Superalloy Fabricated by Additive Manufacturing

Dai,

Zhu,

Yan

et al. 2023

Adv Materials Technologies

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Oxide dispersion strengthened (ODS) nickel (Ni)‐based superalloys are advanced materials known for their outstanding tensile and creep performance at temperatures exceeding 1000 °C. Nevertheless, their conventional synthesis presents a longstanding challenge in cost‐effectively producing intricate components for critical applications. In this work, electrostatic self‐assembly (ESA) of powders with the laser powder bed fusion (LPBF) process have been successfully combined to produce yttria ODS Inconel 718 (IN718) alloy for the first time. The approach has demonstrated a significant contribution of yttria to the strength of IN718 after the solid solution heat treatment, as evidenced by ≈50% improvement in room temperature yield strength with a 0.5 wt.% yttria addition. The addition of yttria by this process leads to a heterogeneous microstructure. This heterogeneous microstructure comprises two distinct grain areas with varying amounts of yttria nanoparticles and dislocation storage. It has been shown that the yield strength increase can be predicted by the combination of both Y2O3 dispersion strengthening and dislocation strengthening mechanisms. These findings offer an effective approach to tailor heterogeneous microstructures, unlocking new opportunities for cost‐effectively producing high‐performance ODS Ni‐based superalloy products with excellent mechanical properties.

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Cu2O Nanoparticles Deposited on Y2O3 and CuO: Synthesis and Antimicrobial Properties

et al. 2022

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This paper reports the preparation of copper(I) oxide nanoparticles deposited on yttrium oxide and copper(II) oxide in the presence of acerola and white willow extracts. Through the use of natural compounds, it was possible to modify the surface of the Y2O3 and CuO carriers allowing Cu2O to be deposited to a greater extent, thus improving the antibacterial properties of the materials. Cu2O nanoparticles, by being deposited on a carrier, enable an increase in the contact surface of the nanoparticles with microorganisms, which react to form reactive oxygen species. Cu2O nanoparticles with sizes of about 38 nm and 76 nm were obtained for Y2O3- and CuO-deposited nanoparticles, respectively. The Gram-negative bacteria Escherichia coli shown a greater sensitivity to the degree of inhibition compared to Staphylococcus Aureus already at a concentration of 250 mg/L. For almost all materials, the inhibition level remained above 50% after 48 h. Analysis of the effect of the antimicrobial properties of the materials against Candida albicans fungus shown high activity which was obtained only at the highest concentrations of 8000 mg/L, for which the degree of growth inhibition was 100% also after 48 h for both Y2O3–Cu2O and CuO–Cu2O.

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Crack elimination and mechanical properties enhancement in additive manufactured Hastelloy X via in-situ chemical doping of Y2O3

Cited by 40 publications

References 45 publications

Si-Assisted Solidification Path and Microstructure Control of 7075 Aluminum Alloy with Improved Mechanical Properties by Selective Laser Melting

Si-Assisted Solidification Path and Microstructure Control of 7075 Aluminum Alloy with Improved Mechanical Properties by Selective Laser Melting

Unique Yttria Nanoparticle Strengthening in an Inconel 718 Superalloy Fabricated by Additive Manufacturing

Cu2O Nanoparticles Deposited on Y2O3 and CuO: Synthesis and Antimicrobial Properties

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