Abstract
Accelerated uniaxial creep tests were carried out on two steels of nominal composition 2 1 4 Cr1Mo containing different concentrations of impurity elements. The specimens were heat treated to produce a flly bainitic microstructure with a prior austenite grain size of about 80 μm. This bainitic microstructure was additionally heat treated to produce an overaged microstructure comprising ferrite laths with a distribution of coarse carbide precipitates. Isothermal tests were carried out under constant load at 873 and 838 K for applied stresses in the range 55 – 217 MPa. Optical microscopy and scanning electron microscopy were used to assess the accumulation of grain boundary cavitation. X-ray microanalysis of thin foils in a scanning transmission electron microscope was used to examine the distribution of impurity elements with atomic numbers greater than 11 within the microstructure including grain boundary carbides. These results are discussed in terms of the effect on the nucleation of creep cavities.
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