Surface microstructure modification of hypereutectic Nb-Si based alloys to improve oxidation resistance without damaging fracture toughness

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

doi:10.1016/j.matchar.2019.110051

Surface microstructure modification of hypereutectic Nb-Si based alloys to improve oxidation resistance without damaging fracture toughness

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

^*Corresponding author for this work

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

18 Citations (Scopus)

Abstract

To achieve a good balance between oxidation resistance and fracture toughness of hypereutectic Nb-Si based alloys, we tune the alloy surface microstructure by an approach of rapid surface remelting. The remelted layer with a refined and modified hypereutectic microstructure is created on a bulk cast Nb-20Si-24Ti-2Cr-2Al (at.%) alloy via electron beam surface melting (EBSM). The EBSM-remelted layer markedly improves the oxidation resistance of the experimental alloy, showing a decreased parabolic rate constant and a reduced weight gain upon oxidation at 1250 °C. Three-point bending tests show that fracture toughness of the EBSM-treated alloy is comparable to that of the cast alloy without EBSM treatment. This work thus demonstrates the capability of surface microstructure modification enabled by rapid remelting for improving the oxidation resistance of Nb-Si based alloys while maintaining the fracture toughness.

Original language	English
Article number	110051
Journal	Materials Characterization
Volume	159
DOIs	https://doi.org/10.1016/j.matchar.2019.110051
Publication status	Published - Jan 2020
Externally published	Yes

Keywords

Electron beam surface melting
Fracture toughness
Nb-Si alloy
Oxidation
Rapid solidification

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10.1016/j.matchar.2019.110051

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title = "Surface microstructure modification of hypereutectic Nb-Si based alloys to improve oxidation resistance without damaging fracture toughness",

abstract = "To achieve a good balance between oxidation resistance and fracture toughness of hypereutectic Nb-Si based alloys, we tune the alloy surface microstructure by an approach of rapid surface remelting. The remelted layer with a refined and modified hypereutectic microstructure is created on a bulk cast Nb-20Si-24Ti-2Cr-2Al (at.%) alloy via electron beam surface melting (EBSM). The EBSM-remelted layer markedly improves the oxidation resistance of the experimental alloy, showing a decreased parabolic rate constant and a reduced weight gain upon oxidation at 1250 °C. Three-point bending tests show that fracture toughness of the EBSM-treated alloy is comparable to that of the cast alloy without EBSM treatment. This work thus demonstrates the capability of surface microstructure modification enabled by rapid remelting for improving the oxidation resistance of Nb-Si based alloys while maintaining the fracture toughness.",

keywords = "Electron beam surface melting, Fracture toughness, Nb-Si alloy, Oxidation, Rapid solidification",

author = "Yueling Guo and Zhiming Li and Junyang He and Haijun Su and Lina Jia and Jun Zhang and Lin Liu and Hu Zhang",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Inc.",

year = "2020",

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doi = "10.1016/j.matchar.2019.110051",

language = "English",

volume = "159",

journal = "Materials Characterization",

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T1 - Surface microstructure modification of hypereutectic Nb-Si based alloys to improve oxidation resistance without damaging fracture toughness

AU - Guo, Yueling

AU - Li, Zhiming

AU - He, Junyang

AU - Su, Haijun

AU - Jia, Lina

AU - Zhang, Jun

AU - Liu, Lin

AU - Zhang, Hu

PY - 2020/1

Y1 - 2020/1

N2 - To achieve a good balance between oxidation resistance and fracture toughness of hypereutectic Nb-Si based alloys, we tune the alloy surface microstructure by an approach of rapid surface remelting. The remelted layer with a refined and modified hypereutectic microstructure is created on a bulk cast Nb-20Si-24Ti-2Cr-2Al (at.%) alloy via electron beam surface melting (EBSM). The EBSM-remelted layer markedly improves the oxidation resistance of the experimental alloy, showing a decreased parabolic rate constant and a reduced weight gain upon oxidation at 1250 °C. Three-point bending tests show that fracture toughness of the EBSM-treated alloy is comparable to that of the cast alloy without EBSM treatment. This work thus demonstrates the capability of surface microstructure modification enabled by rapid remelting for improving the oxidation resistance of Nb-Si based alloys while maintaining the fracture toughness.

AB - To achieve a good balance between oxidation resistance and fracture toughness of hypereutectic Nb-Si based alloys, we tune the alloy surface microstructure by an approach of rapid surface remelting. The remelted layer with a refined and modified hypereutectic microstructure is created on a bulk cast Nb-20Si-24Ti-2Cr-2Al (at.%) alloy via electron beam surface melting (EBSM). The EBSM-remelted layer markedly improves the oxidation resistance of the experimental alloy, showing a decreased parabolic rate constant and a reduced weight gain upon oxidation at 1250 °C. Three-point bending tests show that fracture toughness of the EBSM-treated alloy is comparable to that of the cast alloy without EBSM treatment. This work thus demonstrates the capability of surface microstructure modification enabled by rapid remelting for improving the oxidation resistance of Nb-Si based alloys while maintaining the fracture toughness.

KW - Electron beam surface melting

KW - Fracture toughness

KW - Nb-Si alloy

KW - Oxidation

KW - Rapid solidification

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U2 - 10.1016/j.matchar.2019.110051

DO - 10.1016/j.matchar.2019.110051

M3 - Article

AN - SCOPUS:85076052547

SN - 1044-5803

VL - 159

JO - Materials Characterization

JF - Materials Characterization

M1 - 110051

ER -

Surface microstructure modification of hypereutectic Nb-Si based alloys to improve oxidation resistance without damaging fracture toughness

Abstract

Keywords

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