Accession Number : ADA189302

Title :   The Influence of Strain on Hydrogen Entry, Transport, and Embrittlement of a High Strength Steel in Aqueous Sodium Chloride Solution.

Descriptive Note : Research and development rept.,

Corporate Author : DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD SHIP MATERIALS ENGINEERING DEPT

Personal Author(s) : Scully, John R. ; Moran, Patrick J.

Report Date : MAR 1987

Pagination or Media Count : 201

Abstract : The deleterious effect of hydrogen on the cracking susceptibility of engineering alloys has been well known for over one hundred years. Particularly in the case of high strength steels, hydrogen embrittlement susceptibility has been strongly influenced by two critical factors. These factors are a critical hydrogen content and a critical state of stress. The influence of mechanical strain, especially plastic deformation, on alloy susceptibility is significantly less well understood. Recent empirical observations of increased susceptibility when small transient, periodic, or continuous strains are added to large static stresses have intensified interest in the overall problem. The objective of this investigation is to clarify the mechanism by which plastic deformation affects hydrogen entry, diffusion, and the cracking resistance of a high strength steel exposed in aqueous sodium chloride solution. Keywords: Hydrogen embrittlement, Diffusion, Solubility, Permeation, Hydrogen adsorption, Trapping, Film rupture, Dislocations, Hydrogen absorption, Delayed cracking, Ductility.

Descriptors :   *CRACKING(FRACTURING), *HIGH STRENGTH ALLOYS, *HYDROGEN EMBRITTLEMENT, *STEEL, ABSORPTION, ADSORPTION, CRACKS, DUCTILITY, ELECTROMAGNETIC SUSCEPTIBILITY, HYDROGEN, PLASTIC DEFORMATION, RESISTANCE, RUPTURE, SODIUM CHLORIDE, STRAIN(MECHANICS), LATTICE DYNAMICS, THERMAL DIFFUSION, PLASTIC FLOW, DISLOCATIONS.

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE