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RESEARCH PAPERS

The Strain-Rate and Temperature Dependence of 18Ni(350) Maraging Steel Tensile Properties

[+] Author and Article Information
H. J. Rack

Sandia Laboratories, Albuquerque, N.M.

S. Beitscher

Rockwell Int.-Rocky Flats Div., Golden, Colo.

David Kalish

Bell Telephone Labs., Norcross, Ga.

J. Eng. Mater. Technol. 101(1), 91-97 (Jan 01, 1979) (7 pages) doi:10.1115/1.3443657 History: Received June 20, 1978; Online August 17, 2010

Abstract

The influence of microstructure, strain rate, and test temperature on the tensile properties of 18Ni(350) maraging steel was examined. The strain-rate and temperature dependence of the yield strength is less than that observed in low-strength carbon steels. The results suggest that the thermally activated flow process involves both the by-passing of a linear barrier, i.e., the disruption associated with a dislocation core, and the by-passing of a localized obstacle, the latter being specific to the microstructure being examined. The tensile ductility of aged 18Ni(350) maraging steel also undergoes a ductile-brittle transition. The extent of this ductility loss depends upon the matrix solute content and the presence of either reverted austenite or a highly dislocated substructure.

Copyright © 1979 by ASME
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