PSI - Issue 60

Md Rakim et al. / Procedia Structural Integrity 60 (2024) 136–148 Md Rakim et al. / Structural Integrity Procedia 00 (2023) 000 – 000

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4. Conclusion From experimental investigation and graphical evaluation, the below conclusions have been extracted depending upon temperature points of 27 °C, 650 °C, 710 °C and 750 °C and with aged time up to 20000 hours based on the two forms of alloy 617M i.e., base and welded material specimens using LEFM framework: i. Results and observations have been revealed that alloy 617M shows a general curve with decreasing trend of threshold stress intensity factor ( ) with an increase in the temperature that is limited for a particular temperature range. ii. Observation also reveals that increasing aged duration deteriorates value. The justified reason behind the change in the trend of is the combined effects of DSA, precipitation carbides and gamma prime (γ′) intermetallic precipitate ( Ni 3 ( Al,Ti )). iii. Through comparison curves between both base and weld forms of the alloy 617M, it has been seen that the value for welded alloy is more compared to base materials. iv. The value decreases more as temperature increases for welded material than the base material. This has also been concluded that welded samples are more temperature-sensitive materials. v. It has been concluded from the experimental and graphical analysis of that alloy 617M is an appropriate chemically controlled material for application in AUSC power plant industries based on linear elastic fracture mechanics (LEFM) concept. 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 Anderson, T.L., 2017. Fracture mechanics: fundamentals and applications. CRC Press, Fourth Edition. ASTM E 647-15, Standard Test Method for Measurement of Fatigue Crack Growth Rates. Babu, M.N., Sasikala, G., 2020. Effect of temperature on the fatigue crack growth behaviour of SS316L(N). International Journal of Fatigue 140, 105815. Burke, M.A., Beck, C.G., 1984. The high temperature low cycle fatigue behaviour of the nickel base Alloy IN 617, Metallurgical Transactions A 15, 661-670. Cabet, C., Carroll, L., Wright, R., 2013. Low cycle fatigue and creep-fatigue behavior of alloy 617 at high temperature. Journal of Pressure Vessel Technology 135, 061401-7. Carroll, L.J., Cabet, C., Carroll, M.C., Wright, R.N., 2013. The development of microstructural damage during high-temperature creep-fatigue of a nickel alloy. International Journal of Fatigue 47, 115-125.