Altering Corrosion Response via Grain Boundary Engineering

Tan, L.; Sridharan, Kumar; Allen, T.R.

Paper Titles

Alkali Induced Corrosion of 304-Type Austenitic Stainless Steel at 600°C; Comparison between KCl, K₂CO₃ and K₂SO₄, p.367
Corrosion in Biomass Combustion Systems, p.377
Development of Strain in Oxides Grown in Steam Tubes, p.387
Slag-Refractory Interaction in Slagging Coal Gasifiers, p.397
Altering Corrosion Response via Grain Boundary Engineering, p.409
Modelling of Corrosion Induced Stresses during Zircaloy-4 Oxidation in Air , p.419
Thermodynamic Modelling of the Destruction of the Surface Cr₂O₃ on Alloy 230 in the Impure Helium Atmosphere of a Gas Cooled Reactor, p.429
Comparison of the High Temperature Surface Reactivity in Impure Helium of Two Materials for Gas Cooled Reactors, p.439
Kinetic Study of the Low Temperature Internal Oxidation of Nickel Based Model Alloys Exposed to PWR Primary Water, p.449

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Paper Title:

Altering Corrosion Response via Grain Boundary Engineering

Periodical	Materials Science Forum (Volumes 595 - 598)
Main Theme	High Temperature Corrosion and Protection of Materials 7
Edited by	Pierre Steinmetz, Ian G. Wright, Alain Galerie, Daniel Monceau and Stéphane Mathieu
Pages	409-418
DOI	10.4028/www.scientific.net/MSF.595-598.409
Citation	L. Tan et al., 2008, Materials Science Forum, 595-598, 409
Online since	September, 2008
Authors	L. Tan, Kumar Sridharan, T.R. Allen
Keywords	Cr Volatilization, Cyclic Oxidation, Grain Boundary Character Distribution (GBCD), Intergranular Corrosion, Supercritical Water, Thermal Expansion
Price	US$ 28,-

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Abstract

Grain boundary engineering (GBE) was employed to improve the oxide exfoliation resistance and mitigate oxide growth by optimizing the grain boundary character distribution. Studies were performed on alloys of Incoloy 800H and Inconel 617. Alloys 800H and 617 were selected due to their potential applications for the Generation IV nuclear power systems. The effect of GBE on the corrosion response was evaluated using supercritical water exposure tests and cyclic oxidation tests. The microstructure of the tested samples was analyzed by means of optical microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, electron backscatter diffraction, and gravimetry. The effects of thermal expansion mismatch and Cr volatilization on the corrosion response are discussed.