Next Article in Journal
Metal Pollution Indices of Bottom Sediment and Surface Water Affected by Acid Mine Drainage
Previous Article in Journal
Effects of Laser Offset and Hybrid Welding on Microstructure and IMC in Fe–Al Dissimilar Welding
Article Menu
Issue 8 (August) cover image

Export Article

Open AccessArticle
Metals 2017, 7(8), 283; doi:10.3390/met7080283

Mechanical Characterization of a Nano-ODS Steel Prepared by Low-Energy Mechanical Alloying

1
Department of Civil and Industrial Engineering, University of Pisa, Largo Lucio Lazzarino 2, 56122 Pisa, Italy
2
Department of Industrial Engineering, University of Rome “Tor Vergata”, Via del Politecnico 1, 00133 Rome, Italy
3
Centro Sviluppo Materiali S.p.A., Via di Castel Romano 100, 00128 Rome, Italy
Current address: Nuovo Pignone Spa, GE O&G, Via Felice Matteucci 2, 50127 Firenze, Italy.
Current address: CALEF-ENEA Centro Ricerche Casaccia, Via Anguillarese 301, 00123 Santa Maria di Galeria, Rome, Italy.
*
Author to whom correspondence should be addressed.
Received: 22 June 2017 / Revised: 19 July 2017 / Accepted: 21 July 2017 / Published: 25 July 2017
View Full-Text   |   Download PDF [8010 KB, uploaded 25 July 2017]   |  

Abstract

An oxide dispersion strengthened (ODS) ferritic steel with nanometric grain size has been produced by low-energy mechanical alloying (MA) of steel powder (Fe-14Cr-1W-0.4Ti) mixed with Y2O3 particles (0.3 wt %) and successive hot extrusion (HE). The material exhibits superior mechanical properties with respect to the unreinforced steel up to 400 °C; then such differences tend to progressively decrease and at 700 °C yield stress (YS) and ultimate tensile strength (UTS) values are very close. The microstructure and mechanical behaviour have been compared with those of ODS steels prepared by the most common process, high-energy MA, consolidation through hot isostatic pressing (HIP) or hot extrusion (HE), annealing around 1100 °C for 1–2 h. The main strengthening mechanisms have been examined and discussed to explain the different behaviour. In addition, heat treatments in the range 1050–1150 °C were carried out and a microstructural evolution with a relevant hardness decrease has been observed. TEM observations evidenced defect recovery and partial grain coarsening owing to the not perfectly homogeneous distribution of oxide particles. View Full-Text
Keywords: ODS steel; nanostructure; low-energy mechanical alloying; mechanical properties; heat treatments; strengthening mechanisms ODS steel; nanostructure; low-energy mechanical alloying; mechanical properties; heat treatments; strengthening mechanisms
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Sanctis, M.D.; Fava, A.; Lovicu, G.; Montanari, R.; Richetta, M.; Testani, C.; Varone, A. Mechanical Characterization of a Nano-ODS Steel Prepared by Low-Energy Mechanical Alloying. Metals 2017, 7, 283.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top