EMBRITTLEMENT OF NICKEL, COBALT, ANDIRON-BASE SUPERALLOYS BY EXPOSURE TO HYDROGEN

摘要

Five nickel-base alloys (Inconel 718, Udimet 700, Rene 41, Hastelloy X, and TD-NiCr), one cobalt-base alloy (L-605), and an iron-base alloy (A-286) were exposed in hydrogen at 0.1 MN/m² (15 psi) at several temperatures in the range from 430° to 980° C for as long as 1000 hours. These alloys were embrittled to varying degrees by such exposures in hydrogen. Embrittlement was sensitive to strain rate, was reversible, was caused by large concentra¬tions of absorbed hydrogen, and was not associated with any detectable microstructural changes in the alloys. These observations are consistent with a mechanism of Internal Reversible Hydrogen Embrittlement.