Tuning microstructures and improving oxidation resistance of Nb-Si based alloys via electron beam surface melting

Yueling Guo; Junyang He; Zhiming Li; Lina Jia; Haijun Su; Jun Zhang; Hu Zhang

doi:10.1016/j.corsci.2019.108281

Tuning microstructures and improving oxidation resistance of Nb-Si based alloys via electron beam surface melting

Yueling Guo, Junyang He, Zhiming Li, Lina Jia, Haijun Su^*, Jun Zhang, Hu Zhang

^*Corresponding author for this work

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

24 Citations (Scopus)

Abstract

The bottleneck for the application of Nb-Si based alloys as high-temperature alloys is their poor oxidation resistance. Here we present an approach to tune the microstructures and enhance the oxidation resistance via electron beam surface melting (EBSM) treatment. Significant microstructural refinement, higher volume fraction of silicides and controlled phase regime are achieved by EBSM. The oxidation tests at 1250 °C demonstrate a substantially improved oxidation resistance of the EBSM-processed alloy, with a thinner, less wrinkled oxide scale. A continuous silica layer within the oxide scale is produced on the remelted surface. The oxidation response to tunable microstructures is discussed.

Original language	English
Article number	108281
Journal	Corrosion Science
Volume	163
DOIs	https://doi.org/10.1016/j.corsci.2019.108281
Publication status	Published - Feb 2020
Externally published	Yes

Keywords

Intermetallics
Nb-Si alloy
Oxidation
Rapid solidiﬁcation
Surface melting

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10.1016/j.corsci.2019.108281

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title = "Tuning microstructures and improving oxidation resistance of Nb-Si based alloys via electron beam surface melting",

abstract = "The bottleneck for the application of Nb-Si based alloys as high-temperature alloys is their poor oxidation resistance. Here we present an approach to tune the microstructures and enhance the oxidation resistance via electron beam surface melting (EBSM) treatment. Significant microstructural refinement, higher volume fraction of silicides and controlled phase regime are achieved by EBSM. The oxidation tests at 1250 °C demonstrate a substantially improved oxidation resistance of the EBSM-processed alloy, with a thinner, less wrinkled oxide scale. A continuous silica layer within the oxide scale is produced on the remelted surface. The oxidation response to tunable microstructures is discussed.",

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T1 - Tuning microstructures and improving oxidation resistance of Nb-Si based alloys via electron beam surface melting

AU - Guo, Yueling

AU - He, Junyang

AU - Li, Zhiming

AU - Jia, Lina

AU - Su, Haijun

AU - Zhang, Jun

AU - Zhang, Hu

PY - 2020/2

Y1 - 2020/2

N2 - The bottleneck for the application of Nb-Si based alloys as high-temperature alloys is their poor oxidation resistance. Here we present an approach to tune the microstructures and enhance the oxidation resistance via electron beam surface melting (EBSM) treatment. Significant microstructural refinement, higher volume fraction of silicides and controlled phase regime are achieved by EBSM. The oxidation tests at 1250 °C demonstrate a substantially improved oxidation resistance of the EBSM-processed alloy, with a thinner, less wrinkled oxide scale. A continuous silica layer within the oxide scale is produced on the remelted surface. The oxidation response to tunable microstructures is discussed.

AB - The bottleneck for the application of Nb-Si based alloys as high-temperature alloys is their poor oxidation resistance. Here we present an approach to tune the microstructures and enhance the oxidation resistance via electron beam surface melting (EBSM) treatment. Significant microstructural refinement, higher volume fraction of silicides and controlled phase regime are achieved by EBSM. The oxidation tests at 1250 °C demonstrate a substantially improved oxidation resistance of the EBSM-processed alloy, with a thinner, less wrinkled oxide scale. A continuous silica layer within the oxide scale is produced on the remelted surface. The oxidation response to tunable microstructures is discussed.

KW - Intermetallics

KW - Nb-Si alloy

KW - Oxidation

KW - Rapid solidiﬁcation

KW - Surface melting

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DO - 10.1016/j.corsci.2019.108281

M3 - Article

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SN - 0010-938X

VL - 163

JO - Corrosion Science

JF - Corrosion Science

M1 - 108281

ER -

Tuning microstructures and improving oxidation resistance of Nb-Si based alloys via electron beam surface melting

Abstract

Keywords

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