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Título del libro: Hydrogen Effects On Material Behaviour And Corrosion Deformation Interactions - Proc. Of The International Conference On Hydrogen Effects On Material Behaviour And Corrosion Deformation Interactions
Título del capítulo: On the heat treatment and microstructure in the intergranular stress corrosion cracking response of alloy 600

Autores UNAM:
ANDRES AGUILAR NEGRETE;

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Autores externos:

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Idioma:

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Año de publicación:
2003

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Palabras clave:

Alloys; Crack initiation; Energy dispersive spectroscopy; Grain boundaries; Heat treatment; Microstructure; Scanning electron microscopy; Steam generators; Transmission electron microscopy; Corrosion rate; Cracking response; Intergranular stress corrosion cracking (IGSCC); Polarization curves; Stress corrosion cracking

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Resumen:

The grain boundaries segregation and precipitation has been recognized as a major parameter controlling the susceptibility of alloy 600 to intergranular stress corrosion cracking (ISCC). In this work, the role of heat treatment and the microstructure produced was investigate, in order to analyze the susceptibility of alloy 600 to ISCC induced in steam generators. The samples were heat treated and quenched in a range of 600-1100°C and compared with the mill anneal treatment at 925°C, the microstructure was characterized using SEM-EDX, TEM. Polarization curves and susceptibility to intergranular corrosion in boiling acid solution were used to measure the corrosion rate. The crack growth was measured using the potential drop technique in modified wedge opening displacement samples immersed in an instrumented vessel at temperatures between 200-350°C, containing solutions of 0.1 M NaCl, 0.1 M NaHCO 3 saturated with H2 at 200 kPa. The samples quenched at 800°C shows a wide precipitation of Cr23C6 carbides, preferentially in grain boundaries with a few transgranular precipitates. The other samples show a mixture of Cr7C3, Cr 23C6 and CrS precipitates widespread in matrix and grain boundaries. This heat treatment shows the lower crack growth rate and corrosion rate, the higher performance is related to the microstructure and the grain boundaries composition. Also, the cracking pattern is strongly affected shifted from complete intergranular to transgranular.

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Entidades citadas de la UNAM:

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Fuente:


ISBN:
0873395018
Editorial:

Tipo de producto:
Conference Paper