The effect of heat treatment on the fracture toughness and subcritical crack growth characteristics of a 350-grade maraging steel |
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Authors: | C S Carter |
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Affiliation: | (1) Commercial Airplane Group, The Boeing Company, Renton, Wash. |
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Abstract: | The heat treatment response of a 350-grade maraging steel, with the nominal composition 18.5 Ni, 12 Co, 4.6 Mo, 1.4 Ti, balance
Fe, has been determined in billet and bar form. When aged at temperatures below 900°F, the material was very susceptible to
subcritical crack growth, and premature brittle fracture occurred in unnotched tension specimens loaded at a slow strain rate
in laboratory air. Fracture mechanics was used to interpret this behavior. The introduction of reverted austenite significantly
decreased the strength level but had little effect on fracture toughness. The resistance to brittle fracture of this material
is contrasted with that of high-strength steels currently used by the airplane industry. |
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