PSI - Issue 68

Ahmed W. Abdelghany et al. / Procedia Structural Integrity 68 (2025) 520–526 Abdelghany et al. / Structural Integrity Procedia 00 (2025) 000–000

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Fig. 2. Microstructures recorded in the centre of the 201LN alloy following comprising two-step uniaxial hot compression TMCP schedules, as summarized in Table 2. The average hardness values (HV10) are indicated for each condition.

Fig 3. Graphical representation for the grain size measurements for the microstructures observed in the centre of the 201LN alloy following the TMCP, (a) Average grain size ( D" ), (b) area weighted grain size (AWGS), and (c) grain diameter distribution for various TMCP conditions. The grain size measurements made for various TMCP schedules are graphically illustrated in Fig. 3 (a) and (b). The relationship between average grain size and AWGS follows a consistent pattern, indicating a uniform response to the processing conditions. From the microstructure and grain size analysis it could be seen that longer holding of 60 s following the second compression hit resulted in few statically recrystallized grains even at 900 °C, while increasing the temperature of the second pass to 1000 °C resulted in coarser grains, as higher temperatures expectedly promoted grain growth due to enhanced grain boundary migration and subgrain coalescence (Baik et al., 2021; Radionova et al., 2023). At the second pass temperature (T 2 ) of 900 °C, AWGS for schedules III and IV were recorded in a narrow