Delayed Fracture of Maraging Steels. 2. Mechanism
of Grain-Boundary Embrittlement upon Tests in Air

V. V. Zabil’skii, V. V. Velichko, F. Z. Gil’mutdinov, V. G. Makletsov, and Yu. P. Vorob’ev

Physicotechnical Institute, Ural Division, Russian Academy of Sciences, ul. Kirova 132, Izhevsk, 426001 Russia

Received March 20, 1996; in final form, September 11, 1996

Abstract—The nature of delayed fracture, namely, the mechanism of grain-boundary embrittlement and the
resulting decrease in strength and plasticity of maraging steels upon tests in air were further studied as a con-
tinuation of the earlier work [1]. The effects of titanium content, humidity of laboratory air, and grain-boundary
chemical composition were studied in the temperature range of maximum susceptibility to delayed fracture.
Amechanism of grain-boundary embrittlement with allowance for the interaction between the adsorbed atmo-
spheric moisture and the main chemical components contained in the steel is proposed on the basis of the results
obtained.

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