Abstract
Measurements by Auger electron spectroscopy have been carried out on grain boundaries in a heat-affected zone and in an intercritical zone belonging to a ferritic 0.5 Cr 0.5 Mo 0.25 V weld in a steam pipe operated for about 90, 000 hrs in a thermal power plant.
Results show that in the intercritical zone, P segregates with an enrichment factor by 40% higher than in the grain boundaries of the heat-affected zone. This P segregation behaviour also explains the observed intergranular cavitation in the intercritical zone and its absence in the heat-affected zone. Furthermore, P, Sb, and Cu segregate on the cavity internal walls; an evolution in segregating elements has been observed according to cavity radius and, consequently, to time.
The presence of different kinds of grain boundary carbides, producing different P segregation levels, is expected to playa specific role in enhancing grain boundary cavitation.
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Battaini, P., D’Angelo, D., Olchini, A., Parmigiani, F. (1989). Segregation of Impurities in a Heat-Affected and an Intercritical Zone in an Operated 0.5 Cr 0.5 Mo 0.25 V Steel. In: Cocks, A.C.F., Ponter, A.R.S. (eds) Mechanics of Creep Brittle Materials 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1117-8_19
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DOI: https://doi.org/10.1007/978-94-009-1117-8_19
Publisher Name: Springer, Dordrecht
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