13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- double aging was explained by the precipitation of supersaturated Mo atoms as well as the fine particles of nano-sized ω-phase diffused in the matrix during the second aging of lower temperature. Acknowledgements Chen is grateful to the financial supports by JSPS KAKENHI through grant number 22560097 and by JKA through grant number JS23-99. References [1] R. F. Decker, C. J. Novak, T. W. Londig, Developments and projected trends in maraging steels, Journal of Metals, (1967) 60-66. [2] G. W. Tuffnell, D. L. Pasquine, J. H. Olson, An investigation of fatigue behavior of 18% nickel maraging steel, Transactions of the ASM, 59(1966) 769-783. [3] Y. Murakami , M. Shimizu, Effects of nonmetallic inclusions, small defects and small cracks on fatigue strength of metals, Transactions of the Japan Society of Mechanical Engineers, A, 54(1983) 413-425. [4] K. Endo, K. Komai, T. Fujimoto and Y. Matsuda, “Fatigue crack growth under stress corrosion of a high strength steel”, Transactions of the Japan Society of Mechanical Engineers, A, 45(1979) 1152-1159. [5] R. Tewari, S. Mazumder, I.S. Batra, G.K. Dey and S. Banerjee, Precipitation in 18 wt% Ni maraging steel of grade 350, Acta Materials, 48(2000) 1187-1200. [6] N. Kawagoishi, K. Kariya, T. Nagano, Y. Nakamura, Effect of second-stage-aging on the fatigue properties of maraging steel, Proceedings of 13 th International Conference on Fracture, CD-ROM(2013) to be published. [7] M.F. Garwood, H.H. Zurburg, M.A. Ericson, Interpretation of tests and correlation with service, “Correlation of laboratory tests and service performance”, American Society for Metals, (1951) 1-77. [8] H. Kobayashi, H. Nakazawa, A. Komine, Fatigue fracture toughness of maraging steel, Transactions of the Japan Society of Mechanical Engineers, 41(1975) 9-21. [9] R.O. Ritchie, M.H. Cantro Cedemo, V.H. Zackey, E.R. Parker, Effects of Silicon additions and retained austenite on stress corrosion cracking in ultra strength steels, Metallurgical Transaction, 9A(1978) 35-40. [10] N. Kawagoishi, T. Nagano, M. Moriyama, Y. Ohzono, T. Ura, Effect of humidity on fatigue strength of maraging steel, Transactions of the Japan Society of Mechanical Engineers, Series A, 71(2005) 600-606.
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