PSI - Issue 60

Md Rakim et al. / Procedia Structural Integrity 60 (2024) 298–310

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Md Rakim et al. / Structural Integrity Procedia 00 (2023) 000 – 000

2. At 27 °C, it has been observed that J IC values resemble higher which explains the increase in strength along with total elongation compared to temperatures at 650 °C, 710 °C and 750 °C. 3. From the curves, it has been observed that J IC value decreases with an increase in ageing time. However, it has also been seen that this change in J IC value is different for some particular ageing time. 4. For high-temperature regimes, it has been observed that the J-R curve shows deviated trends compared to room temperature. 5. Through comparison between the forms of Alloy 617M, it has been concluded that the value of fracture toughness in the case of forged alloy samples is more compared to base and weld materials. 6. Moreover, weld material shows the least fracture toughness value for all aged conditions and also the drop in J IC value is much higher compared to the other two forms of alloy 617M for all temperature conditions. 7. The presence of DSA which is apparent from the tensile test influences the fracture toughness depending on the temperature window. Also, based on temperature range and age duration microstructural changes that take place also influence J IC .

Acknowledgements

The authors would like to acknowledge Dr. G. Sasikala formerly Head, MDTD and Dr. Shaju K. Albert, formerly Director MMG and Chairman AUSC PEC, IGCAR Kalpakkam, India, for their support of this work.

References

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