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Título del libro: Proceedings Of The 2008 International Hydrogen Conference - Effects Of Hydrogen On Materials
Título del capítulo: Microstructural effects on the stress corrosion cracking response of an alloy 600

Autores UNAM:
ANDRES AGUILAR NEGRETE; OSVALDO FLORES CEDILLO; BERNARDO FABIAN CAMPILLO ILLANES;

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Autores externos:

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Idioma:

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Año de publicación:
2009

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Palabras clave:

Carbides; Crack tips; Fatigue crack propagation; Grain boundaries; Heat resistance; Heat treatment; Hydrogen; Intergranular corrosion; Metallic glass; Microstructure; Nickel alloys; Pressurized water reactors; Residual stresses; Alloy 600; Constant temperature; Grain boundary carbides; IGSCC; Initial conditions; Intergranular stress corrosion cracking; Micro-structural effects; Potential drop technique; Stress corrosion cracking

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Resumen:

There have been numerous works aimed to elucidate the active mechanisms involved in the intergranular stress corrosion cracking (IGSCC) of Ni-based alloys. In particular, it has been found that hydrogen might play a dominant role in either crack initiation and/or crack growth during the IGSCC of Inconel 600 when exposed to pressurized water reactor (PWR) environments. In the present work, pre-cracked compact self-loaded modified WOL specimens were employed in order to investigate the IGSCC resistance of a heat-treated Inconel alloy 600. Various heat treatments were performed in order to obtain several microstructural initial conditions. Moreover, the potential drop technique was used to monitor crack propagation in a simulated PWR environment under constant temperature. It was found that the IGSCC susceptibility can be linked to the exhibited microstructures, specifically the grain boundary carbide precipitation reactions (carbide free, low-decorated or semi-continuous grain boundaries). In particular, the microstructures which induce relatively low crack growth rates were associated with the development of significant plastic deformation at the crack tip. In addition, some common features were found between the IGSCC performance and the pre-fatigue cracking conditions. For this purpose, the fatigue crack growth properties of this alloy were also evaluated using the ASTM E 606-92 Standard. Copyright © 2009 ASM International® All rights reserved.

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Entidades citadas de la UNAM:

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Fuente:


ISBN:
9781615030033
Editorial:
ASM International

Tipo de producto:
Conference Paper