Microstructure and mechanical properties of high niobium β-γ TiAl and IN718 alloy joints diffusion bonded by spark plasma sintering

Gao, Qiang; Zhang, Laiqi; Liu, Jiyao; Lin, Junpin

doi:10.1016/j.intermet.2022.107745

Cited by 8 publications

(1 citation statement)

References 21 publications

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“…Such alloys maintain a stable austenite structure at high temperatures owing to numerous secondary phases (MC, M23C6, M7C3 carbides) formed by the addition of various alloying elements, thereby improving their high-temperature strength [18]. In addition, they contain ordered intermetallic compounds (γ ′ or γ ′′ ) that are stable at high temperatures, thus contributing to their considerable creep resistance [19]. Therefore, Ni-based superalloys maintain high strength at high temperatures and exhibit excellent resistance against creep, fatigue, and corrosion, resulting in their extensive application in harsh environments.…”

Section: Introductionmentioning

confidence: 99%

Effects of Niobium Carbide Additions on Ni-Based Superalloys: A Study on Microstructures and Cutting-Wear Characteristics through Plasma-Transferred-Arc-Assisted Deposition

Chen,

Lin

2024

Coatings

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This study applied plasma transferred arc (PTA) welding to fabricate hard cladding layers by using nickel-based superalloy (NCR7) and niobium carbide (NbC) powders as filler material. The resultant composite claddings were coated onto ductile iron and then analyzed to understand the effect of different quantities of NbC on the solidification structures of the cladding layers and on the characteristics of the interface between the cladding layers and the ductile iron. Cutting tests were also conducted to assess the morphology and mechanism of flank wear on PTA NbC/NCR7 composite cladding tools. The results revealed that the cladding specimens’ microstructures comprised a mixture of dendrites and interdendritic eutectics along with a considerable quantity of carbides (MC, M7C3, and M23C6) scattered within the γ-Ni matrix. Incorporating considerable NbC carbide enhanced the claddings’ surface hardness, but it had a limited effect on improving the flank wear on the turning tools. The flank wear on the composite cladding tools intensified as the NbC content was increased. The wear behavior, defined by brittle fractures and stripped NbC particles, led to a decline in turning tool performance. Accordingly, the Ni-based alloy composite cladding with larger NbC particles appears more suitable for sliding or erosion applications under normal stress conditions.

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Section: Introductionmentioning

confidence: 99%