PSI - Issue 14

S. Vishnuvardhan et al. / Procedia Structural Integrity 14 (2019) 482–490 S. Vishnuvardhan / Structural Integrity Procedia 00 (2018) 000–000

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Table 4. FCG constants for SA 333 Gr. 6 and SA 516 Gr. 70 steels under demineralized water environment. FCG Constants SA 333 Gr. 6 steel SA 516 Gr. 70 steel c 5 X 10 -9 8 x 10 -9 m 3.223 3.098

6. Summary and Conclusions Fatigue crack growth (FCG) studies were carried out on ESE(T) specimens made of SA 333 Gr. 6 and SA 516 Gr. 70 steels in demineralized water and 3.5% NaCl aqueous environments. During the FCG experiments, crack initiation and growth were continuously monitored and images were recorded at regular intervals of loading cycles. Under demineralized water environment, fatigue crack growth rate in SA 516 Gr. 70 steel was observed to be more when compared with SA 333 Gr. 6 steel. In the case of SA 333 Gr. 6 steel, fatigue life (corresponding to maximum crack length satisfying the elastic check criterion) decreased approximately by 15.0% when the applied current increased from 0.2 A to 0.3 A under 3.5% NaCl aqueous environment. In the case of SA 516 Gr. 70 steel, fatigue life (corresponding to maximum crack length satisfying the elastic check criterion) decreased approximately by 20.5 % when the applied current increased from 0.2 A to 0.3 A under 3.5% NaCl aqueous environment. Crack growth rate ( da/dN ) and stress intensity factor range ( ∆ K ) values were evaluated at incremental values of crack length. Using the crack growth rate ( da/dN ) vs. stress intensity factor range ( ∆ K ) plots, best fit curves following power law in the form of Paris’ equation were obtained for SA 333 Gr. 6 and SA 516 Gr. 70 steels under demineralised water and 3.5% NaCl aqueous environments. Acknowledgements The authors thank the Director and Advisor (Management), CSIR-SERC, Chennai for the constant support and encouragement extended to them in their R&D activities. The assistance rendered by the technical staff of the Fatigue & Fracture Laboratory, CSIR-SERC in conducting the experimental investigations is gratefully acknowledged. References Horstmann, M., Gregory, J. K., Schwalbe, K. H., 1995. Geometry effects on corrosion-fatigue in offshore structural steels . International Journal of Fatigue 17, 293-299. Sivaprasad, S., Tarafder, S., Ranganath, V. R., Tarafer, M., Ray, K. K., 2006. Corrosion fatigue crack growth behaviour of naval steels. Corrosion Science 48, 1996-2013. Chinnaiah Madduri, Raghu V. Prakash, 2010. Corrosion fatigue crack growth studies in Ni-Cr-Mn Steel. International Journal of Mechanical and Mechatronics Engineering 4, 1402-1407. Dong-Hwan Kang, Jong-Kwan Lee, Tae-Won Kim, 2011. Corrosion fatigue crack propagation of high-strength steel HSB800 in a seawater environment. Procedia Engineering 10, 1170-1175. Fatigue crack growth behavior of reactor pressure vessel steels in air and high-temperature water environments. Shu-Xin Li, Akid, L., 2013. Corrosion fatigue life prediction of a steel shaft material in seawater. Engineering Failure Analysis 34, 324-334. Huang, J. Y., Yeh, J. J., Kuo, R. C., Jeng, S. L., Young, M. C., 2008. International Journal of Pressure Vessels and Piping 85(11), 772-781. Jamasri, M. N., Ilman, R., Seokrisno, Triyono, 2011. Corrosion Fatigue Behaviour of resistance spot-welded dissimilar metals welds between carbon steel and stainless steel with different thickness. Procedia Engineering 10, 649-654. Raghava, G., Vishnuvardhan, S., Gandhi, P., 2014. Corrosion Fatigue Crack Growth Studies on IS 2062 Steel. First International Conference on Structural Integrity, Kalpakkam Vishnuvardhan, S., Raghava, G., Gandhi, P., Saravanan, M., 2015. Effect of corrosion current on fatigue crack growth rate in structural steel. Corrosion Conference & Expo, Chennai ASTM A 333-05. Standard specification for seamless and welded steel pipe for low-temperature service. ASTM International , USA . ASTM A 516-10. Standard specification for pressure vessel plates, carbon steel, for moderate- and lower-temperature service. ASTM International , USA . ASTM E 8M-11. Standard test methods for tension testing of metallic materials. ASTM International , USA . ASTM E 647-13. Standard test for measurement of fatigue crack growth rates. ASTM International, USA . ASTM E 1820-13. Standard test methods for measurement of fracture toughness. ASTM International, USA . Aarthi, P. S., Raghava, G., Vishnuvardhan, S., Surendar, M., 2015. Accelerated corrosion fatigue studies on SA 333 Gr. 6 carbon steel. International Journal of Innovative Research in Science, Engineering and Technology 4(6), 1687-1696