Abstract
Compact tension (CT) and surface crack tension (SCT) specimens of 18 Ni 1800 MPa grade maraging steel (parent metal and welded) were studied for the cyclic crack growth rate applying in sinusoidal (SL) and block loading (BL) conditions. The BL cycle was designed to simulate the stress intensity levels experienced during proof pressure and static test of a fabricated rocket motor. The threshold stress intensity for stage II crack growth for weldment is found to be about 0.6 that for the parent metal. For a given stress intensity, the crack growth rate for weldment and parent metal are in the same range under SL or BL. Through-thickness cracks (laboratory condition) in CT specimens and part-through thickness cracks (service condition) in SCT specimens show good correlation for cyclic crack growth rate. The results are of great significance for considering the reuse of the maraging steel rocket motor case.
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V. Diwakar, S. Arumugham, T. S. Lakshmanan andB. K. Sarkar,J. Mater. Sci. 20 (1985) 1351.
Idem, ibid. 21 (1986) 1927.
G. Venkatnarayana, V. M. J. Sharma, K. Gangadhara Reddy andV. Diwakar, “Crack Growth Characteristics of M250 Grade Maraging Steel”, VSSC Technical Report, VSSC:MMS:MMG:TAF:10:87 Trivandrum (November, 1987).
Annual Book of ASTM Standards, Part 10, ASTM E399 pp. 588–618; ASTM E647, pp. 765–783; and ASTM E740, pp. 793–803 (American Society for Testing and Materials, Philadelphia, Pennsylvania, 1981).
J. C. Lewis andG. Sines (ed.), in “Fracture Mechanics”, 14th Symposium, Vol. 2, Testing and Application, ASTM STP 791 (American Society for Testing and Materials, Philadelphia, Pennsylvania, 1983) p. 11.
R. Roberts, in “Fracture Mechanics”, Proceedings of the 13th National Symposium on Fracture Mechanics, ASTM STP 743 (American Society for Testing and Materials, Philadelphia, Pennsylvania, 1983) p. 6.
B. K. Neale andR. H. Priest, “On the Unloading Compliance Method for Crack Length Measurement”, CEGB Report, UK, TPRD/B/0085/N82 (May, 1982).
J. B. Chang, “Part-through Crack Fatigue Life Prediction”, ASTM STP 687 (American Society for Testing and Materials, Philadelphia, Pennsylvania, 1979).
P. C. Paris, in “Fatigue — An Interdisciplinary Approach“ (Syracuse, NY, 1964) pp. 107–127.
Annual Book of ASTM Standards, Part 10, ASTM E616, pp. 729–738 (American Society for Testing and Materials, Philadelphia, Pennsylvania, 1981).
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Diwakar, V., Arumugam, S., Lakshmanan, T.S. et al. Crack growth characteristics of maraging steel. J Mater Sci 24, 881–884 (1989). https://doi.org/10.1007/BF01148772
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DOI: https://doi.org/10.1007/BF01148772