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Synopsis: In P-doped 2.25 wt% Cr steels with variations in Mo and C contents, isothermally aged (embrittled) at 773 K for times up to•`1 000 h, the intergranular segregation and embrittlement behavior has been examined by means of Auger electron spectroscopy and instrumented Charpy impact tests. C, Cr, and Mo, together with P, segregated to the grain boundaries, but their segregated concentrations were believed to vary widely in different grain boundary facets. In contrast to the enrichment of the intergranular P concentration, depletion of the grain boundary C concentration was found during the first step of aging. In addition to the retardation effect of Mo on the segregation to grain boundaries of P, it also had an effect of suppressing the decrease in intergranular fracture strength due to P-segregation (•hDirect strengthening effect•h). The brittle fracture load (Lf) vs. temperature diagrams were divided into the lower temperature region (Region I) where Lf was independent of test temperature and aging time, and the higher temperature region (II) where Lf increased rapidly with test temperature, and also a further brittle region (III) which was specific to the high C steels. The transition temperature from region I to II was very sensitive to aging time in one steel but was not so in the other steel. The reason for this has been discussed.

Intergranular Segregation and the Resultant Embrittlement in P-doped 2.25 wt% Cr Steels with Variations in Mo and C Contents