Accession Number : ADA331056

Title :   The Resistance of High-Strength Alloys to Hydrogen Embrittlement,

Corporate Author : SRI INTERNATIONAL MENLO PARK CA MATERIALS RESEARCH CENTER

Personal Author(s) : Pound, Bruce G.

PDF Url : ADA331056

Report Date : JUN 1994

Pagination or Media Count : 14

Abstract : The resistance of an alloy to hydrogen embrittlement (HE) is strongly influenced by the presence of microstructural heterogeneities, which can provide sites to trap hydrogen. The entry and trapping of hydrogen in a range of high-strength alloys have been investigated with a technique referred to as hydrogen ingress analysis by potentiostatic Pulsing (HIAPP). Data were analyzed by using a diffusion/trapping model to determine entry and trapping parameters for high-strength steels, Precipitation-hardened and work-hardened nickel-base alloys, and titanium alloys. For most of the alloys studied, the observed resistance to HE appeared to be determined primarily by the alloy's intrinsic Susceptibility as defined by the trapping characteristics; that is, the H entry flux generally has only a secondary effect on the resistance to HE. However, in one case, the HE resistance was attributable to a low entry flux. This type of case highlights the need for characterizing alloys in terms of both trapping capability and rate of H entry to account for differences observed in their HE resistance.

Descriptors :   *SYMPOSIA, *HIGH STRENGTH ALLOYS, *HYDROGEN EMBRITTLEMENT, *POTENTIOSTATIC TECHNIQUES, THERMOMECHANICS, MICROSTRUCTURE, HETEROGENEITY, NICKEL ALLOYS, TITANIUM ALLOYS.

Subject Categories : Properties of Metals and Alloys
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE