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Effect of Titanium and Carbon on Microstructure and Mechanical Properties of Disordered Solid Solution Fe–7 wt%Al Alloy

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Abstract

The effect of combined addition of carbon and titanium on structure and properties of Fe–7 wt%Al alloys has been studied. Pancakes of four alloys with nominal compositions, Fe–7Al–0.05C–0.2Ti (alloy-1), Fe–7Al–0.5C–2.0Ti (alloy-2), Fe–7Al–1.0C–4.0Ti (alloy-3) and Fe–7Al–2.0C–8.0Ti (alloy-4) were prepared by non-consumable arc melting. The arc melted pancakes were examined using scanning electron microscopy, electron probe microanalysis, and X-ray diffraction to understand the microstructure of these alloys. The dendritic solidification structure was observed in alloys 2–4. The microstructure of these alloys also revealed the presence of TiC precipitates, whereas no such phase was observed in alloy 1. The size and volume fraction of these precipitates increased with increase in the concentration of Ti and C. The yield strength of Fe–7 wt%Al alloy at both room temperature and at 873 K increases with increasing carbon and titanium.This may be due to the composite strengthening arising out of increased precipitations of hard TiC precipitates.

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Acknowledgments

The authors are grateful to Defence Research and Development Organization (DRDO), Ministry of Defence, New Delhi for the financial support in carrying out this research work. The authors wish to thank Dr. Amol A Gokhale, Director DMRL Hyderabad for his interest and encouragement. The authors would like to thank fellow officers and staff of ERG (melting & casting), ACG (chemical analysis), MEG (sample making), SFAG (Metallography, EPMA & XRD), EMG (SEM & EDAX) and MBG (Compression).

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Authors and Affiliations

  1. Defence Metallurgical Research Laboratory, Kanchanbagh, Hyderabad, 500058, India

    Shishir Chaudhary, Shivkumar Khaple, V. V. Satya Prasad, A. Sambasiva Rao & R. G. Baligidad

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  1. Shishir Chaudhary
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  2. Shivkumar Khaple
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  3. V. V. Satya Prasad
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  4. A. Sambasiva Rao
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  5. R. G. Baligidad
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Correspondence to Shishir Chaudhary.

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Chaudhary, S., Khaple, S., Satya Prasad, V.V. et al. Effect of Titanium and Carbon on Microstructure and Mechanical Properties of Disordered Solid Solution Fe–7 wt%Al Alloy. Trans Indian Inst Met 68, 809–815 (2015). https://doi.org/10.1007/s12666-015-0514-z

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  • DOI: https://doi.org/10.1007/s12666-015-0514-z

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