Microstructure and isothermal oxidation behavior of Nb-Ti-Si-based alloy additively manufactured by powder-feeding laser directed energy deposition

Yunlong Li; Xin Lin; Yunlong Hu; Xuehao Gao; Jun Yu; M. Qian; Hongbiao Dong; Weidong Huang

doi:10.1016/j.corsci.2020.108757

Microstructure and isothermal oxidation behavior of Nb-Ti-Si-based alloy additively manufactured by powder-feeding laser directed energy deposition

Yunlong Li, Xin Lin, Yunlong Hu, Xuehao Gao, Jun Yu, M. Qian, Hongbiao Dong, Weidong Huang

School of Materials Sience and Engineering

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

A powder-feeding laser directed energy deposition process has been used for preparing Nb-Ti-Si-based alloys from elemental powder mixtures. The effects of hot isostatic pressing (HIP) on the microstructure evolution and isothermal oxidation at 800 °C and 1250 °C are studied. The as-deposited alloy shows a eutectic microstructure with β-Nb₅Si₃ dendrites existing in the solid-solution niobium (Nbss) matrix and β-Nb₅Si₃+Nbss anomalous eutectic in the interdendritic zones. A eutectoid reaction of β-Nb₅Si₃→Nbss+α-Nb₅Si₃ occurs after HIP. The oxidation rate for the HIP-processed alloy was 1.33 times that of the as-deposited alloy at 1250 °C. No pest-oxidation is observed on the as-deposited alloy at 800 °C.

Original language	English
Article number	108757
Journal	Corrosion Science
Volume	173
DOIs	https://doi.org/10.1016/j.corsci.2020.108757
State	Published - 15 Aug 2020

Keywords

HIP
isothermal oxidation
Laser directed energy deposition
Microstructure
Nb-Ti-Si-based
powder-feeding

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title = "Microstructure and isothermal oxidation behavior of Nb-Ti-Si-based alloy additively manufactured by powder-feeding laser directed energy deposition",

abstract = "A powder-feeding laser directed energy deposition process has been used for preparing Nb-Ti-Si-based alloys from elemental powder mixtures. The effects of hot isostatic pressing (HIP) on the microstructure evolution and isothermal oxidation at 800 °C and 1250 °C are studied. The as-deposited alloy shows a eutectic microstructure with β-Nb5Si3 dendrites existing in the solid-solution niobium (Nbss) matrix and β-Nb5Si3+Nbss anomalous eutectic in the interdendritic zones. A eutectoid reaction of β-Nb5Si3→Nbss+α-Nb5Si3 occurs after HIP. The oxidation rate for the HIP-processed alloy was 1.33 times that of the as-deposited alloy at 1250 °C. No pest-oxidation is observed on the as-deposited alloy at 800 °C.",

keywords = "HIP, isothermal oxidation, Laser directed energy deposition, Microstructure, Nb-Ti-Si-based, powder-feeding",

author = "Yunlong Li and Xin Lin and Yunlong Hu and Xuehao Gao and Jun Yu and M. Qian and Hongbiao Dong and Weidong Huang",

note = "Publisher Copyright: {\textcopyright} 2020 Elsevier Ltd",

year = "2020",

month = aug,

day = "15",

doi = "10.1016/j.corsci.2020.108757",

language = "英语",

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journal = "Corrosion Science",

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T1 - Microstructure and isothermal oxidation behavior of Nb-Ti-Si-based alloy additively manufactured by powder-feeding laser directed energy deposition

AU - Li, Yunlong

AU - Lin, Xin

AU - Hu, Yunlong

AU - Gao, Xuehao

AU - Yu, Jun

AU - Qian, M.

AU - Dong, Hongbiao

AU - Huang, Weidong

PY - 2020/8/15

Y1 - 2020/8/15

N2 - A powder-feeding laser directed energy deposition process has been used for preparing Nb-Ti-Si-based alloys from elemental powder mixtures. The effects of hot isostatic pressing (HIP) on the microstructure evolution and isothermal oxidation at 800 °C and 1250 °C are studied. The as-deposited alloy shows a eutectic microstructure with β-Nb5Si3 dendrites existing in the solid-solution niobium (Nbss) matrix and β-Nb5Si3+Nbss anomalous eutectic in the interdendritic zones. A eutectoid reaction of β-Nb5Si3→Nbss+α-Nb5Si3 occurs after HIP. The oxidation rate for the HIP-processed alloy was 1.33 times that of the as-deposited alloy at 1250 °C. No pest-oxidation is observed on the as-deposited alloy at 800 °C.

AB - A powder-feeding laser directed energy deposition process has been used for preparing Nb-Ti-Si-based alloys from elemental powder mixtures. The effects of hot isostatic pressing (HIP) on the microstructure evolution and isothermal oxidation at 800 °C and 1250 °C are studied. The as-deposited alloy shows a eutectic microstructure with β-Nb5Si3 dendrites existing in the solid-solution niobium (Nbss) matrix and β-Nb5Si3+Nbss anomalous eutectic in the interdendritic zones. A eutectoid reaction of β-Nb5Si3→Nbss+α-Nb5Si3 occurs after HIP. The oxidation rate for the HIP-processed alloy was 1.33 times that of the as-deposited alloy at 1250 °C. No pest-oxidation is observed on the as-deposited alloy at 800 °C.

KW - HIP

KW - isothermal oxidation

KW - Laser directed energy deposition

KW - Microstructure

KW - Nb-Ti-Si-based

KW - powder-feeding

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U2 - 10.1016/j.corsci.2020.108757

DO - 10.1016/j.corsci.2020.108757

M3 - 文章

AN - SCOPUS:85085544666

SN - 0010-938X

VL - 173

JO - Corrosion Science

JF - Corrosion Science

M1 - 108757

ER -

Microstructure and isothermal oxidation behavior of Nb-Ti-Si-based alloy additively manufactured by powder-feeding laser directed energy deposition

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Keywords

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