Journal of Research of the National Bureau of Standards
Creep tests were made in tension under constant loads at temperatures of 300�, 700�, 900�, and 1,200� F on specimens of nickel initially cold-drawn to 40-peroent reduction in area. None of the equations for defining the strain-time relationship proposed by other investigators was found to be suitable to express or predict the creep-test results of this investigation with high accuracy because these equations inadequately describe the changes in structure accompanying the creep processes. However, conformance to the parabolic strain-time law was obtained over limited ranges of stresses and strains. The effects of cold-drawing on the creep properties are discussed. Certain etching techniques were employed that gave evidence of the presence and movement of dislocations in the structure.
J. Res. Nat. Bur. Stand., Sec. C: Eng. Instr., Vol. 63C, No. 1, p. 1
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