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Oxide Film Characterization after the crack propagation in CT specimens of AISI 304L under Hydrogen Water Chemistry Condition.

Published online by Cambridge University Press:  07 March 2016

Ángeles Díaz Sánchez ,
Aida Contreras Ramírez  and
Carlos Arganis Juárez
Ángeles Díaz Sánchez
Affiliation:
Instituto Nacional de Investigaciones Nucleares. Carretera México-Toluca s/n, La Marquesa Ocoyoacac, México C.P.52750
Aida Contreras Ramírez
Affiliation:
Instituto Nacional de Investigaciones Nucleares. Carretera México-Toluca s/n, La Marquesa Ocoyoacac, México C.P.52750
Carlos Arganis Juárez
Affiliation:
Instituto Nacional de Investigaciones Nucleares. Carretera México-Toluca s/n, La Marquesa Ocoyoacac, México C.P.52750
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Abstract

Stress Corrosion Cracking (SCC) in a general term describing stressed alloy fracture that occurs by crack propagation in specifically environments, and has the appearance of brittle fracture, yet it can occur in ductile materials like AISI 304L used in internal components of Boiling Water Reactors (BWR). The high levels of oxygen and hydrogen peroxide generated during an operational Normal Water Condition (NWC) promotes an Electrochemical Corrosion Potential (ECP), enough to generate SCC in susceptible materials. Changes in water chemistry have been some of the main solutions for mitigate this degradation mechanism, and one of these changes is reducing the ECP by the injection of Hydrogen in the feed water of the reactor; this addition moves the ECP below a threshold value, under which the SCC is mitigated (-230mV vs SHE). This paper shows the characterization by Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and Raman Spectroscopy of the oxide film formed in to a crack propagated during a Rising Displacement Test method (RDT), on Hydrogen Water Chemistry (HWC) conditions: 20 ppb O2, 125 ppb H2, P=8MPa, T=288°C, using a CT specimen of austenitic stainless steel AISI 304L sensitized. The characterization allowed identifying the magnetite formation since an incipient way, until very good formed magnetite crystals.

Keywords

FatigueCorrosionFracture
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1814: Symposium 6H – Materials in Nuclear Science and Technology—2015 , 2016 , imrc2015sim28-abs026
Copyright
Copyright © Materials Research Society 2016 

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References

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