In-situ synthesis and characterization of lightweight steel matrix composites reinforced by TiB2

Abstract

This study aimed to synthesize lightweight steels in situ reinforced with 5 % and 10 vol% of TiB2 and evaluate the microstructural, physical, and mechanical properties. The Fe-(15;20 wt%)Mn-3 wt%Al-0.1 wt%C with 5 and 10 vol% of TiB2 were produced by spray forming followed by hot rolling and annealing. The concept of varying the manganese content was to assess the influence of the matrix constitution on the composite properties. The findings pointed to a direct correlation between the manganese content and the size and morphology of the TiB2 particles. The presence of the ceramic particles re-established the modulus of elasticity above 200 GPa only for composites with a predominantly ferritic matrix. The composites with a matrix composed mostly of austenite showed no gains in ductility during the tensile tests despite the activation of the TWIP effect. However, their wear behavior stands out positively.

Keywords

• Lightweight steels
• Composites
• Titanium diboride
• Microstructure
• Mechanical properties