Volume 16, Issue 5 (September 1988)
Evaluation of Creep Rupture Behavior of 1Cr-1Mo-0.25V Steel with 0.04 wt% Sn
Results of creep rupture testing of a commercial quality 1Cr-1Mo-0.25V steel forging with 0.04 wt% Sn at 500, 550, and 600°C over a range of stresses for periods varying from about 4600 to 27 000 h have been reported. Rupture lives were found to be higher and rupture ductilities to be lower than data available in the literature for a similar steel. Auger electron spectroscopic analysis of specimens creep tested at 500 and 550°C for 25 692 h and 27 203 h, respectively, revealed no perceptible segregation of Sn to grain boundaries. Thus Sn (0.04 wt%) does not appear to be responsible for the lower rupture ductilities observed in this investigation. Selected area electron diffraction of carbides extracted by carbon extraction replicas from interrupted creep specimens, currently in progress, may possibly explain the observed anomalies in the creep behavior.