PSI - Issue 60

B Shashank Dutt et al. / Procedia Structural Integrity 60 (2024) 471–483 Author name / StructuralIntegrity Procedia 00 (2019) 000 – 000

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4. Conclusions The following are the conclusions of this study

 J -R curves were established for SS 316 LN welds subjected to various aging treatments and tested at RT, 380 and 550 °C. Form J 1c values, equivalent K j1c values were determined. K 1c values were estimated from tensile properties. The estimated K 1c values were within 1-21%, compared to determined K j1c values.  Estimation of fracture resistance was also carried out for similar class (E308, 316L and E347) of welds subjected to various aging conditions (400 °C, 5000-10,000 h durations) and tested at two temperatures (25 and 320 °C). For these welds, estimated K 1c were within 20-31 % of determined fracture toughness values.  Estimation of K 1c was also carried out for cast stainless steel welds and at different locations. For these welds, estimated K 1c were within 21-29 % of determined fracture toughness values.  From the estimated K 1c results, it is summarized that previously proposed estimation of fracture resistance is applicable for 316 type austenitic stainless steel welds. References ASTM E8/E8M-16a, 2016, Standard Test Methods for Tension Testing of Metallic Materials, ASTM International, 1-29. ASTM E1820-17a, 2017, Standard Test Method for Measurement of Fracture Toughness, ASTM International, 1-46. Baskes, M.I., 1975. A simplified prediction of K 1c from tensile data. Engineering fracture Mechanics 7, 249-251. Chandra, K., Kain, V., Bhutani, V., Raja, V.S., Tewari, R., Dey, G.K., Chakravartty, J.K., 2012. Low temperature thermal ageing of austenitic stainless steel welds: Kinetics and effects on mechanical properties. Materials Science and Engineering A 534, 163 – 175. Dutt, B.S., Sasikala, G., Shanthi, G., Venugopal, S., Babu, M.N., Parida, P.K., Bhaduri, A.K., 2011. Mechanical Behaviour of SS 316 (N) weld after long term exposure to service temperatures. Procedia Engineering 10, 2725-2730. Dutt, B.S., Babu, M.N., Shanthi, G., Moitra, A., Sasikala, G., 2018. Effect of Thermal Aging and Test Temperatures on Fracture Toughness of SS 316(N) Welds. Journal of Materials Engineering and Performance 127, 1957-1961. Hahn, G.T., Rosenfield, A.R., 1968. Sources of fracture toughness the relation between KIC and the ordinary tensile properties of metals, in “Applications Related phe nome na in Titanium Alloys”. In ASTM STP, 5-32. Hong, S., Kim,H., Kong, B.S., Jang, C., Shin, I.H., Yang, J.S., Lee, K.S., 2018. Evaluation of the thermal ageing of austenitic stainless steel welds with 10 % of δ -ferrites. International journal of pressure vessels and piping 167, 32-42. Hong, S., Seo, M.G., Jang, C., Lee,K.S., 2015. Evaluation of the effects of thermal aging austenitic stainless steel welds using small punch test. Procedia Engineering 130, 1010-1018.