Abstract
In 1959 Baker and Nutting established that the carbides precipitated during the tempering of bainitic 2.25Cr-1Mo pressure vessel steels followed the sequence M/sub 3/C, Mo/sub 2/C, M/sub 7/C/sub 3/, M/sub 23/C/sub 6/ and M/sub 6/C. Titchmarsh and later Pilling and Ridley identified characteristic energy dispersive X-ray spectra for these carbides. Recent studies of the early stages of tempering in a 3Cr-1.5Mo steel have revealed a carbide, containing both chromium and molybdenum, which does not correspond to the above characteristic spectra. Convergent beam electron diffraction (CBED) and energy dispersive X-ray (EDX) analyses have been carried out to investigate the structure and composition of this carbide and also to study the change in tempering kinetics produced by additions of chromium and molybdenum to 2.25Cr-1Mo pressure vessel steels.
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