• V V SATYA PRASAD

      Articles written in Bulletin of Materials Science

    • Microstructure and wear behaviour of FeAl-based composites containing in-situ carbides

      RAVI KANT UJJWAL PRAKASH VIJAYA AGARWALA V V SATYA PRASAD

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      Iron aluminides containing carbon are promising materials for tribological applications. Because of graphite formation at higher ($>$20 wt%) Al-contents the addition of carbon to FeAl-based alloys has not been successful.The graphite precipitation may be avoided by addition of Zr or Ti. Dry sliding wear behaviour of FeAl based alloys containing 1–1.5wt% carbon with quaternary addition of Ti or Zr has been studied using ball-on-disk wear test. Effect of sliding speeds and applied loads is investigated and correlated with mechanical properties. Wear resistance of FeAl-based alloys is found to be significantly improved on addition of Ti/Zr. This is attributed to the high hardness of alloy carbides. The lower load-bearing capacity of graphite flakes in localized region was found to increase the wear rate of the alloy. The carbides such as Fe$_3$AlC$_{0.5}$, TiC and ZrC are embedded in the matrix after sliding wear without destruction or delamination. This significantly affects the wear resistance of FeAl-based alloys.

    • Evolution of microstructure with increasing carbon content and its effect on mechanical properties of disordered iron–aluminium alloy

      SHIVKUMAR KHAPLE D V V SATYANARAYANA V V SATYA PRASAD BRAHMA RAJU GOLLA

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      Correlation of microstructure and mechanical properties of hot-rolled Fe–7 wt.% Al with varying carbon contents has been investigated in detail. The microstructures of the alloys change significantly with an increase in the carboncontent. An alloy with 0.012 wt.% carbon shows a single ferrite phase, whereas with increase in carbon up to 0.65 wt.%, the microstructure evolves into a dual phase consisting of ferrite and $\kappa$-pearlite. At about 1.5 wt.% carbon, the alloy exhibits only $\kappa$-pearlite and with a further increase in carbon to 2.2 wt.%, an additional phase starts precipitating in the form of graphite. The room temperature tensile strength of the alloy increased significantly with an increase in the carbon content, which is in agreement with the microstructure. The yield strength and hardness of the steels with different carbon contents can becorrelated well with the inter-barrier spacing in different steels.

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