Deformation effects on chromium diffusivity and grain boundary chromium depletion development in type 316 stainless steels

A kinetic evaluation of GBCD development in Type 316 austenitic stainless steels (SS) is presented, using the indirect electrochemical potentiokinetic reactivation (EPR) test method. The evaluation of Cr diffusion data as a function of strain and temperature indicates that acceleration in GBCD is du...

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Bibliographic Details
Published in:Scripta metallurgica 1991-02, Vol.25 (2), p.461-465
Main Authors: Advani, A.H., Atteridge, D.G., Murr, L.E., Bruemmer, S.M., Chelakara, R.
Format: Article
Language:English
Subjects:
360102 - Metals & Alloys- Structure & Phase Studies
640302 - Atomic, Molecular & Chemical Physics- Atomic & Molecular Properties & Theory
ALLOYS
ATOM TRANSPORT
ATOMIC AND MOLECULAR PHYSICS
AUSTENITIC STEELS
CARBIDES
CARBON COMPOUNDS
CHEMICAL REACTION KINETICS
CHEMISTRY
CHROMIUM
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
COATINGS
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
DIFFUSION
ELECTROCHEMISTRY
ELEMENTS
FABRICATION
GRAIN BOUNDARIES
HEAT RESIS
HEAT TREATMENTS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
MATERIALS SCIENCE
MATERIALS WORKING
METALS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NEUTRAL-PARTICLE TRANSPORT
NICKEL ALLOYS
PRECIPITATION
PROTECTIVE COATINGS
RADIATION TRANSPORT
REACTION KINETICS
SEPARATION PROCESSES
STAINLESS STEEL-316
STAINLESS STEELS
STEEL-CR17NI12MO3
STEELS
THERMOMECHANICAL TREATMENTS
TRANSITION ELEMENTS
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Description
Summary:A kinetic evaluation of GBCD development in Type 316 austenitic stainless steels (SS) is presented, using the indirect electrochemical potentiokinetic reactivation (EPR) test method. The evaluation of Cr diffusion data as a function of strain and temperature indicates that acceleration in GBCD is due to alteration in Cr diffusivity at low temperatures. No change in diffusivity was observed at higher temperatures, which explains why a reduced (possibility thermodynamic) effect of strain is observed at higher temperatures. Strain--temperature--diffusivity data developed in this work have also been found to show excellent agreement with trends predicted by the Hart model for dislocation pipe diffusion of substitutional elements. This suggests that strain effects on kinetics of GBCD in Type 316SS are controlled by a dislocation-pipe diffusion mechanism. Graphs. 9 ref.--J.H.
ISSN:0956-716X
0036-9748
DOI:10.1016/0956-716X(91)90211-I