Microstructure of rapidly solidified Nb-based pre-alloyed powders for additive manufacturing

Yueling Guo; Lina Jia; Bin Kong; Shengnan Zhang; Fengxiang Zhang; Hu Zhang

doi:10.1016/j.apsusc.2017.02.221

Microstructure of rapidly solidified Nb-based pre-alloyed powders for additive manufacturing

Yueling Guo, Lina Jia^*, Bin Kong, Shengnan Zhang, Fengxiang Zhang, Hu Zhang

^*Corresponding author for this work

Beihang University

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

20 Citations (Scopus)

Abstract

For powder-based additive manufacturing, sphere-shaped Nb-37Ti-13Cr-2Al-1Si pre-alloyed powders were prepared by plasma rotating electrode processing (PREP). The microstructure, surface oxidation and microhardness of the pre-alloyed powders were systematically investigated. Results showed that the main phases were Nb solid solution (Nbss) and Cr ₂ Nb. The Cr ₂ Nb phases were further determined using transmission electron microscopy (TEM). Fine dendrite structures were observed in the as-fabricated pre-alloyed powders, which transformed to large grains after heat treatment (HT) at 1450 °C for 3 h. With the increase of powder size, the secondary dendrite arm spacing (SDAS) increased and the microhardness (HV) decreased. A clean powder surface free of oxide particles was obtained by PREP and an oxide layer with 9.39 nm in thickness was generated on the powder surface. Compared with Cr- and Nb-oxides, more Ti-oxides were formed on outmost powder surface with a higher content of Ti (up to 47.86 at.%). The differences upon the microstructure and microhardness of the pre-alloyed powders with different sizes were discussed.

Original language	English
Pages (from-to)	367-374
Number of pages	8
Journal	Applied Surface Science
Volume	409
DOIs	https://doi.org/10.1016/j.apsusc.2017.02.221
Publication status	Published - 1 Jul 2017
Externally published	Yes

Keywords

Microstructure
Niobium based alloy
Powder metallurgy
Rapid solidification
Surface oxide

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10.1016/j.apsusc.2017.02.221

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title = "Microstructure of rapidly solidified Nb-based pre-alloyed powders for additive manufacturing",

abstract = " For powder-based additive manufacturing, sphere-shaped Nb-37Ti-13Cr-2Al-1Si pre-alloyed powders were prepared by plasma rotating electrode processing (PREP). The microstructure, surface oxidation and microhardness of the pre-alloyed powders were systematically investigated. Results showed that the main phases were Nb solid solution (Nbss) and Cr 2 Nb. The Cr 2 Nb phases were further determined using transmission electron microscopy (TEM). Fine dendrite structures were observed in the as-fabricated pre-alloyed powders, which transformed to large grains after heat treatment (HT) at 1450 °C for 3 h. With the increase of powder size, the secondary dendrite arm spacing (SDAS) increased and the microhardness (HV) decreased. A clean powder surface free of oxide particles was obtained by PREP and an oxide layer with 9.39 nm in thickness was generated on the powder surface. Compared with Cr- and Nb-oxides, more Ti-oxides were formed on outmost powder surface with a higher content of Ti (up to 47.86 at.%). The differences upon the microstructure and microhardness of the pre-alloyed powders with different sizes were discussed.",

keywords = "Microstructure, Niobium based alloy, Powder metallurgy, Rapid solidification, Surface oxide",

author = "Yueling Guo and Lina Jia and Bin Kong and Shengnan Zhang and Fengxiang Zhang and Hu Zhang",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2017",

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day = "1",

doi = "10.1016/j.apsusc.2017.02.221",

language = "English",

volume = "409",

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T1 - Microstructure of rapidly solidified Nb-based pre-alloyed powders for additive manufacturing

AU - Guo, Yueling

AU - Jia, Lina

AU - Kong, Bin

AU - Zhang, Shengnan

AU - Zhang, Fengxiang

AU - Zhang, Hu

PY - 2017/7/1

Y1 - 2017/7/1

N2 - For powder-based additive manufacturing, sphere-shaped Nb-37Ti-13Cr-2Al-1Si pre-alloyed powders were prepared by plasma rotating electrode processing (PREP). The microstructure, surface oxidation and microhardness of the pre-alloyed powders were systematically investigated. Results showed that the main phases were Nb solid solution (Nbss) and Cr 2 Nb. The Cr 2 Nb phases were further determined using transmission electron microscopy (TEM). Fine dendrite structures were observed in the as-fabricated pre-alloyed powders, which transformed to large grains after heat treatment (HT) at 1450 °C for 3 h. With the increase of powder size, the secondary dendrite arm spacing (SDAS) increased and the microhardness (HV) decreased. A clean powder surface free of oxide particles was obtained by PREP and an oxide layer with 9.39 nm in thickness was generated on the powder surface. Compared with Cr- and Nb-oxides, more Ti-oxides were formed on outmost powder surface with a higher content of Ti (up to 47.86 at.%). The differences upon the microstructure and microhardness of the pre-alloyed powders with different sizes were discussed.

AB - For powder-based additive manufacturing, sphere-shaped Nb-37Ti-13Cr-2Al-1Si pre-alloyed powders were prepared by plasma rotating electrode processing (PREP). The microstructure, surface oxidation and microhardness of the pre-alloyed powders were systematically investigated. Results showed that the main phases were Nb solid solution (Nbss) and Cr 2 Nb. The Cr 2 Nb phases were further determined using transmission electron microscopy (TEM). Fine dendrite structures were observed in the as-fabricated pre-alloyed powders, which transformed to large grains after heat treatment (HT) at 1450 °C for 3 h. With the increase of powder size, the secondary dendrite arm spacing (SDAS) increased and the microhardness (HV) decreased. A clean powder surface free of oxide particles was obtained by PREP and an oxide layer with 9.39 nm in thickness was generated on the powder surface. Compared with Cr- and Nb-oxides, more Ti-oxides were formed on outmost powder surface with a higher content of Ti (up to 47.86 at.%). The differences upon the microstructure and microhardness of the pre-alloyed powders with different sizes were discussed.

KW - Microstructure

KW - Niobium based alloy

KW - Powder metallurgy

KW - Rapid solidification

KW - Surface oxide

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VL - 409

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JO - Applied Surface Science

JF - Applied Surface Science

ER -

Microstructure of rapidly solidified Nb-based pre-alloyed powders for additive manufacturing

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Keywords

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