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

André L. Vidilli , Lucas B. Otani , Guilherme Y. Koga , Vicente Amigó , Claudemiro Bolfarini
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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.

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TiB2 增强轻质钢基复合材料的原位合成与表征
本研究旨在合成原位增强 5% 和 10% TiB2 的轻质钢,并评估其微观结构、物理和机械性能。通过喷射成形,然后进行热轧和退火,制备了含 5% 和 10% TiB2 的 Fe-(15;20 wt%)Mn-3 wt%Al-0.1 wt%C 钢。改变锰含量的目的是评估基体结构对复合材料性能的影响。研究结果表明,锰含量与 TiB2 颗粒的大小和形态直接相关。陶瓷颗粒的存在只对铁素体基体为主的复合材料的弹性模量重新恢复到 200 GPa 以上。基体主要由奥氏体组成的复合材料在拉伸试验中没有显示出延展性的提高,尽管激活了 TWIP 效应。然而,它们的磨损行为却表现出了积极的一面。
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