Sh. Song et al., Grain boundary phosphorus and molybdenum segregation under irradiation andthermal conditions in a 2.25CrlMo steel, MAT SCI E A, 286(2), 2000, pp. 230-235
Segregation of P and Mo to prior austenite grain boundaries in a 2.25Cr1Mo
steel subjected to neutron irradiation and ageing is examined using field e
mission gull scanning transmission electron microscopy (FEGSTEM) with energ
y dispersive X-ray microanalysis. The steel samples are irradiated and aged
at around 270 and 400 degrees C, respectively. The irradiation dose rate a
nd dose are about 1.05 x 10(-8) dpa s(-1) and 0.032 dpa for 370 degrees C-i
rradiation, and 1.75 x 10(-8) dpa s(-1) and 0.13 dpa for 400 degrees C-irra
diation. The FEGSTEM results indicate that, during 270 degrees C-irradiatio
n, there is no irradiation effect for P segregation and some effect for Mo
segregation with the Mo boundary concentration decreasing. During 400 degre
es C-irradiation, there is a slight irradiation effect for P segregation wi
th the P boundary concentration increasing and some irradiation effect for
Mo segregation with the Mo boundary concentration decreasing. The 400 degre
es C-ageing does not enhance Mo segregation as compared with the 270 degree
s C-ageing, but it enhances P segregation. (C) 2000 Elsevier Science S.A. A
ll rights reserved.