Abstract
The nucleation and growth of intergranular cavities during the creep of type 321 stainless steel were investigated. Creep samples were solution heat treated at 1112°C for 7.2 ks and then subjected to a stabilization treatment of 288 ks at 910°C. A clean microstructure was obtained with only a few coarse primary precipitates. Four samples were then deformed in creep at 49.6 MPa and 812°C for 83.5, 135, 163 and 238 ks. After a careful sample preparation procedure, a large number of cavities were measured in each sample. The cavity size distributions in the samples were obtained. The rate of nucleation of cavities was found to be approximately proportional to time in the interval studied. The cavity growth rate as a function of the cavity size was calculated using the cavity size distributions and was compared with theoretical models.
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