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RESEARCH PAPERS

Cryogenic Tensile, Fatigue, and Fracture Parameters for a Solution-Annealed 18 Percent Nickel Maraging Steel

[+] Author and Article Information
R. L. Tobler, R. P. Reed, R. E. Schramm

Cryogenics Division, Institute for Basic Standards, National Bureau of Standards, Boulder, Colo.

J. Eng. Mater. Technol 100(2), 189-194 (Apr 01, 1978) (6 pages) doi:10.1115/1.3443470 History: Received September 19, 1977; Revised December 19, 1977; Online August 17, 2010

Abstract

The mechanical properties of an eighteen percent nickel, solution-annealed 300-grade maraging steel were measured to assist in the evaluation of this material for low-temperature structural applications. Tensile, fatigue-crack growth rate, and fracture toughness tests were perfromed in ambient air (295 K), liquid nitrogen (76 K), and liquid helium (4 K), with the following results: (1) the yield strength of this material increases from 831 MPa at room temperature to 1596 MP a at 4 K; (2) the tensile ductility is moderate with elongation decreasing from 15.5 to 6.7 percent for this temperature region; (3) the estimated values of fracture toughness (KIc ) decrease from 165 MPa·m1/2 at room temperature to 83 MPa·m1/2 at 4 K; and (4) the fatigue-crack propagation resistance at intermediate stress intensity ranges is relatively insensitive to temperature. These results are compared with similar data for other cryogenic alloys.

Copyright © 1978 by ASME
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