Browsing by Author "Murthy T.S.R.C."

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    Impression creep behaviour of TiB2 particles reinforced steel matrix composites
    (2018) Sahoo S.; Jha B.B.; Mahata T.S.; Sharma J.; Murthy T.S.R.C.; Mandal A.
    Impression creep behaviour of the powder metallurgy processed steel matrix composites was investigated under constant stress at different temperatures in the range of 873�973 K. By using the power-law relationship, the estimated activation energy for unreinforced steel was found to be 149 kJ mol?1 and steel reinforced with 2 and 4 vol.-% TiB2 was found to be 298 and 338 kJ mol?1, respectively indicating better creep resistance of the reinforced steel matrix composites. Dislocation creep is the dominant creep mechanism based on the calculated values of stress exponent and activation energy. Hence, this method can be used to assess the potential of steel matrix composites for use as structural materials for high-temperature application. � 2018, � 2018 Institute of Materials, Minerals and Mining.
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    Mechanical and Wear Behaviour of Hot-Pressed 304 stainless Steel Matrix Composites Containing TiB 2 Particles
    (2019) Sahoo S.; Jha B.B.; Mahata T.; Sharma J.; Murthy T.S.R.C.; Mandal A.
    In the present article, mechanical and wear behaviour of hot-pressed 304 stainless steel matrix composites containing 2 and 4�vol% TiB 2 particles was investigated. A density of over 92% was achieved at optimum hot-pressing temperature and TiB 2 particles� content. Microhardness and yield strength of the composites were found to be improved remarkably as compared to their unreinforced counterpart. The enhancement of mechanical properties of the composites was discussed in light of their microstructural aspects and different possible strengthening mechanism models. Taylor strengthening was found to be dominant strengthening mechanism as compared to Orowan strengthening and load-bearing effect. Dry sliding wear behaviour was also investigated under load of 35�N at sliding speed 0.3�m/s. The wear resistance of the composites was found to be improved owing to uniform distribution of hard TiB 2 particles. Based on our findings, it was concluded that processing parameters and amount of TiB 2 have significant influence on mechanical and wear behaviour of steel matrix composites. � 2019, The Indian Institute of Metals - IIM.