Densification and grain boundary nitrides in spark plasma sintered SAF 2205 -TiN composite

Samuel Ranti Oke; Oladeji Oluremi Ige; Oluwasegun Eso Falodun; Peter Apata Olubambi; Johan Westraadt

doi:10.1016/j.ijrmhm.2019.02.021

Densification and grain boundary nitrides in spark plasma sintered SAF 2205 -TiN composite

Samuel Ranti Oke, Oladeji Oluremi Ige, Oluwasegun Eso Falodun, Peter Apata Olubambi, Johan Westraadt

Metallurgy

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

16 Citations (Scopus)

Abstract

Densification and nature of α-ferrite γ-austenite interface associated with the spark plasma sintering (SPS) of SAF 2205 reinforced with TiN nanoparticles was investigated. The sintering data obtained during SPS was used to evaluate the densification mechanism. EBSD and TKD technique were used to characterize the SAF 2205 composite. The grain and grain boundary properties were evaluated using nanoindentation technique. Three densification stages relating to particles rearrangement, bulk deformation and rapid densification of the SAF 2205 composite was observed during SPS. The EBSD revealed a reverse ferrite to austenite phase transformation and a refined microstructure after SPS. TKD analysis of the grain boundary showed nanosized sintered-in nitride coexisting with ferrite and austenite upon sintering at α/γ interface but also at α/α and γ/γ interfaces. TKD-EDS compositional mapping revealed Ti-rich grain boundary. Nanoindentation experiments reveal that the TiN dominated grain boundaries exhibit lower penetration depths, an indication of higher hardness and modulus.

Original language	English
Pages (from-to)	78-84
Number of pages	7
Journal	International Journal of Refractory Metals and Hard Materials
Volume	81
DOIs	https://doi.org/10.1016/j.ijrmhm.2019.02.021
Publication status	Published - Jun 2019

Keywords

Grain boundary nitrides
Microstructure
SAF 2205
Spark plasma sintering (SPS)
TiN nanoparticles

ASJC Scopus subject areas

Ceramics and Composites
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.ijrmhm.2019.02.021

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title = "Densification and grain boundary nitrides in spark plasma sintered SAF 2205 -TiN composite",

abstract = "Densification and nature of α-ferrite γ-austenite interface associated with the spark plasma sintering (SPS) of SAF 2205 reinforced with TiN nanoparticles was investigated. The sintering data obtained during SPS was used to evaluate the densification mechanism. EBSD and TKD technique were used to characterize the SAF 2205 composite. The grain and grain boundary properties were evaluated using nanoindentation technique. Three densification stages relating to particles rearrangement, bulk deformation and rapid densification of the SAF 2205 composite was observed during SPS. The EBSD revealed a reverse ferrite to austenite phase transformation and a refined microstructure after SPS. TKD analysis of the grain boundary showed nanosized sintered-in nitride coexisting with ferrite and austenite upon sintering at α/γ interface but also at α/α and γ/γ interfaces. TKD-EDS compositional mapping revealed Ti-rich grain boundary. Nanoindentation experiments reveal that the TiN dominated grain boundaries exhibit lower penetration depths, an indication of higher hardness and modulus.",

keywords = "Grain boundary nitrides, Microstructure, SAF 2205, Spark plasma sintering (SPS), TiN nanoparticles",

author = "Oke, {Samuel Ranti} and Ige, {Oladeji Oluremi} and Falodun, {Oluwasegun Eso} and Olubambi, {Peter Apata} and Johan Westraadt",

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

year = "2019",

month = jun,

doi = "10.1016/j.ijrmhm.2019.02.021",

language = "English",

volume = "81",

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T1 - Densification and grain boundary nitrides in spark plasma sintered SAF 2205 -TiN composite

AU - Oke, Samuel Ranti

AU - Ige, Oladeji Oluremi

AU - Falodun, Oluwasegun Eso

AU - Olubambi, Peter Apata

AU - Westraadt, Johan

PY - 2019/6

Y1 - 2019/6

N2 - Densification and nature of α-ferrite γ-austenite interface associated with the spark plasma sintering (SPS) of SAF 2205 reinforced with TiN nanoparticles was investigated. The sintering data obtained during SPS was used to evaluate the densification mechanism. EBSD and TKD technique were used to characterize the SAF 2205 composite. The grain and grain boundary properties were evaluated using nanoindentation technique. Three densification stages relating to particles rearrangement, bulk deformation and rapid densification of the SAF 2205 composite was observed during SPS. The EBSD revealed a reverse ferrite to austenite phase transformation and a refined microstructure after SPS. TKD analysis of the grain boundary showed nanosized sintered-in nitride coexisting with ferrite and austenite upon sintering at α/γ interface but also at α/α and γ/γ interfaces. TKD-EDS compositional mapping revealed Ti-rich grain boundary. Nanoindentation experiments reveal that the TiN dominated grain boundaries exhibit lower penetration depths, an indication of higher hardness and modulus.

AB - Densification and nature of α-ferrite γ-austenite interface associated with the spark plasma sintering (SPS) of SAF 2205 reinforced with TiN nanoparticles was investigated. The sintering data obtained during SPS was used to evaluate the densification mechanism. EBSD and TKD technique were used to characterize the SAF 2205 composite. The grain and grain boundary properties were evaluated using nanoindentation technique. Three densification stages relating to particles rearrangement, bulk deformation and rapid densification of the SAF 2205 composite was observed during SPS. The EBSD revealed a reverse ferrite to austenite phase transformation and a refined microstructure after SPS. TKD analysis of the grain boundary showed nanosized sintered-in nitride coexisting with ferrite and austenite upon sintering at α/γ interface but also at α/α and γ/γ interfaces. TKD-EDS compositional mapping revealed Ti-rich grain boundary. Nanoindentation experiments reveal that the TiN dominated grain boundaries exhibit lower penetration depths, an indication of higher hardness and modulus.

KW - Grain boundary nitrides

KW - Microstructure

KW - SAF 2205

KW - Spark plasma sintering (SPS)

KW - TiN nanoparticles

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JO - International Journal of Refractory Metals and Hard Materials

JF - International Journal of Refractory Metals and Hard Materials

ER -

Densification and grain boundary nitrides in spark plasma sintered SAF 2205 -TiN composite

Abstract

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ASJC Scopus subject areas

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