Diffusivity, solubility and trapping behavior of hydrogen in alloys 600, 690tt and 800

The permeation technique and a potentiostatic pulse technique were used to investigate the diffusivity, solubility, and trapping behavior of hydrogen (H) in three austenitic alloys: 600, 690tt and 800. The apparent diffusivity increases with nickel content, whereas the solubility decreases. The diff...

Full description

Saved in:
Bibliographic Details
Published in:Corrosion science 1998-04, Vol.40 (4), p.645-662
Main Authors: Uhlemann, M., Pound, B.G.
Format: Article
Language:English
Subjects:
A. superalloys
Applied sciences
B. galvanostatic
B. hydrogen permeation
B. potentiostatic
C. hydrogen absorption
Exact sciences and technology
Fractures
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The permeation technique and a potentiostatic pulse technique were used to investigate the diffusivity, solubility, and trapping behavior of hydrogen (H) in three austenitic alloys: 600, 690tt and 800. The apparent diffusivity increases with nickel content, whereas the solubility decreases. The diffusivity decreases with cold work. In the alloys with 50% cold work, H is reversibly trapped in the stress field of dislocations. The rate constants for irreversible trapping paralleled the observed resistance to environmentally assisted cracking of the non-cold-worked alloys. The principal irreversible traps appeared to be carbide/carbonitride precipitates. Microvoids provided additional irreversible traps in precharged, cold-worked alloy 600.
ISSN:0010-938X
1879-0496
DOI:10.1016/S0010-938X(97)00167-4