The development of precipitation microstructure during stress-relief heat treatment of the bainitic heat-affected zone in 2.25Cr-1Mo steel has been studied using transmission electron microscopy, scanning transmission electron microscopy, and energy-dispersive X-ray analysis techniques on carbon extraction replicas and thin foils. Examinations have been made of four 2.25Cr-1Mo alloys (‘pure’, doped with 540 ppm phosphorous, doped with 500 ppm tin, and commercial purity) as part of an overall investigation into stress-relief cracking in 2.25Cr- 1Mo steel. The precipitation behaviour is discussed in terms of its relevance to fracto graphic observations and segregation characteristics which are reported in detail elsewhere.
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