Impression creep behaviour of TiB₂ particles reinforced steel matrix composites

Abstract

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.

Powder metallurgy processed TiB2-reinforced steel matrix composites: a review

“…They reported a remarkable increase in wear performance of composites and suggested its potential application for high performance tribological components. Sahoo et al [149] reported similar findings for wear performance of hot pressed steel matrix composite. They observed the positive impact of TiB 2 particles on wear resistance of steel matrix and thereby, making them potential for many applications.…”

“…Sahoo et al. [149] reported similar findings for wear performance of hot pressed steel matrix composite. They observed the positive impact of TiB 2 particles on wear resistance of steel matrix and thereby, making them potential for many applications.…”

“…The relative contribution of Orowan strengthening in composite with 4 vol.-% TiB 2 was found to be increased by 1.45 times as compared with composite containing 2 vol.-% TiB 2 . In a subsequent work [142], the authors also investigated the influence of TiB 2 on creep behaviour of P/M processed steel matrix composite by using the power law relationship and reported improvement of creep strength with TiB 2 content.

Figure 11 Influence of various strengthening mechanisms in steel matrix composites sintered at (a) 1000°C and (b) 1100°C.

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Figure 11 Influence of various strengthening mechanisms in steel matrix composites sintered at (a) 1000°C and (b) 1100°C. Adapted with permission from Springer [142].

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