PSI - Issue 60

Cyril Reuben Raj et al. / Procedia Structural Integrity 60 (2024) 709–722 Cyril Reuben Raj / StructuralIntegrity Procedia 00 (2024) 000 – 000

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3.4. Effect on thermal aging on tensile properties

3.4.1 Effect on thermal aging at Weld fusion zone

Fig. 11. Stress strain curves of as-welded and thermal aged weld tensile specimens along the weld fusion line: (a) GTAW zone and (b) SMAW zone. Table 6. Tensile tests on weld specimens of GTAW and SMAW at different aging conditions. SI. No Specimen ID Specimen location Yield Strength (MPa) Ultimate Tensile Strength (MPa) % Elongation 1 SSW-R GTAW 507 671 59.43 2 SSW-R SMAW 423 713 62.06 3 SSW-T41 GTAW 423 656 77.55 4 SSW-T41 SMAW 450 677 37 5 SSW-T42 GTAW 463.72 697.69 60.75 6 SSW-T42 SMAW 450.05 703.9 38.07 Figure 11 shows the stress vs strain curves weld specimens ((a) GTAW and (b) SMAW) for different thermal aging conditions. The aging conditions of both types of welds were denoted as: SSW-R for as-welded, SSW-T41 for thermal aging at 400 ℃ for 10,000 hrs and SSW- T42 for thermal aging at 400 ℃ for 20,000 hrs. The tensile properties obtained from the stress vs strain curve for each aging conditions is listed in table 6. Figure 11a shows that there is slight change in the tensile properties of weld specimen after thermal aging with respect to as-welded.