PSI - Issue 71

S.R. Reddy et al. / Procedia Structural Integrity 71 (2025) 172–179

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contrast to this samples tested at 900 ° C as shown in Fig.2 (c) and Fig. 3 (c) reveals the flow softening both at low and high strain rates with strain rate sensitivity consistently above m ≥ 0.4 representing other deformation mechanisms active at higher temperatures with grain boundary sliding as possible mechanism due to its significant grain coarsening resistance.

Fig. 3 Strain rate Jump test at different temperatures (a) 700 °C (b) 800 °C (c) 900 °C (Reddy et al., 2024a) for different strain rates.

Fig. 4 (a) Variation in strain rate with stress tested at different strain rates and temperatures (b) Variation of stress with homologous temperature at different strain rates. Fig. 4 (a) shows the change in strain rate with stress tested at different strain rates and temperatures and Fig.4 (b) shows the change in stress with homologous temperature at different strain rates respectively. From the Fig. 4 the