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Fracture mechanics techniques were used to investigate low temperature fatigue crack propagation properties of 5Ni and 9Ni steels. The 5Ni alloy was also tested in the welded condition. Fatigue loading was primarily zero tension, but some data were taken for fully reversed, compression-tension loading in the unwelded materials. Conventional log-log plots of range in stress intensity parameter, ΔK, versus cyclic growth rate, Δa/ΔN, were used to assess material fatigue crack propagation behavior at −320°F, −260°F, and room temperature (70°F). Fracture toughness measurements were also obtained at −260 and −320°F for both steels and for the heat affected zone (HAZ) of the welded 5Ni steel.
fracture properties, mechanical properties, crack propagation, weldments, nickel steels, low temperature tests
Bucci, R. J.
Vice president of Research, Del Research Corp., Hellertown, Pa.
Greene, B. N.
Project metallurgist, Esso Research and Engineering Company, Florham Park, N. J.
Paris, P. C.
President, Del Research Corp., Hellertown, Pa.