Structural characterization and nanoindentation studies on mechanical properties of spark plasma sintered duplex stainless steel nanocomposite

Samuel Ranti Oke, Mahlatse R. Mphahlele, Oladeji Oluremi Ige, Oluwasegun Eso Falodun, Avwerosuoghene Moses Okoro, Peter Apata Olubambi

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Nano-sized titanium nitride (TiN) powders were used as reinforcements for the fabrication of duplex stainless steel (SAF 2205) via spark plasma sintering (SPS) route. Optimized parameters of 1150 °C temperature, 100 °C/min heating rate, 50 MPa pressure and 15 min holding time were utilized for sintering of the SAF 2205-TiN composite. SEM equipped with an EBSD and TKD detectors were used to gain insight into sintered composite microstructures and grain boundary character. XRD was used to study crystallinity and phase transformation. The discrete mechanical properties of ferrite/austenite grains and grain boundaries were studied using nanoindentation technique. The addition of TiN nanoparticles resulted in decrease of the α-Fe peaks with principal planes shifting from α-Fe (110) to γ-Fe (111). The EBSD confirmed that the addition of TiN nanoparticles to duplex stainless steel could initiate and advance ferrite to austenite phase reverse transformation. The TKD confirmed that nanosized nitrides are concentrated at the ferrite/austenite interface. The nanoindentation studies showed that the nano-hardness (H), elastic modulus (E), plasticity index (Ψ), and anti-wear properties were improved with the TiN nanoparticle addition from 0 to 8 wt%.

Original languageEnglish
Article number155648
JournalJournal of Alloys and Compounds
Volume840
DOIs
Publication statusPublished - 5 Nov 2020

Keywords

  • Duplex stainless steel (SAF 2205)
  • Interfacial characterization
  • Nanoindentation
  • Spark plasma sintering (SPS)
  • Titanium nitride (TiN)

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'Structural characterization and nanoindentation studies on mechanical properties of spark plasma sintered duplex stainless steel nanocomposite'. Together they form a unique fingerprint.

Cite this