Journal
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
Volume 8, Issue 1, Pages 1141-1149Publisher
ELSEVIER
DOI: 10.1016/j.jmrt.2018.07.019
Keywords
Composite; Carbon nanotube; Sintering; Microstructure; Mechanical properties
Funding
- Hungarian Scientific Research Fund (OTKA) [K-109021]
- National Research, Development and Innovation Office (NKFIH) [PD-121049]
- MTA EK project Nanostructural ODS steel development
- Hungarian Ministry of Human Capacities [NTP-NFTO-16-0957]
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Composites of 316L steel and carbon nanotubes (CNTs) were produced by powder metallurgy using high energy milling and spark plasma sintering. The influence of CNT content on the microstructure and the mechanical properties was studied, therefore in addition to the composite samples containing 1 and 3 wt.% CNTs, a 316L specimen without CNTs was also processed. It was found that the CNT addition resulted in a smaller grain size and a higher dislocation density in the matrix. The fraction of the Fe3C phase formed due to the CNT addition increased with increasing the CNT content. The smaller grain size, the higher dislocation density and the larger fraction of the Fe3C phase led to a higher hardness in the samples containing CNTs. At the same time, the strength determined by bending was reduced, most probably due to the weak bonding between the 316L grains and the CNTs. (C) 2018 Brazilian Metallurgical, Materials and Mining Association. Published by Elsevier Editora Ltda.
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