Abstract
The more widespread use of 9Cr-1Mo-based steels (modified and un-modified) is limited, in part, by a lack of understanding of the welding behaviour of this class of materials. A series of weldments, based on modified 9Cr-1Mo alloy steels, with varying Si and Mn contents was investigated using transmission electron microscopy (TEM). All as-deposited samples were found to consist of laths of heavily dislocated martensite separated by an interlath phase. Addition of Si was found to increase the amount of refined austenite (γ) present in the interlath region, whilst increasing Mn content promoted carbide formation. At high levels of both additions, a banded structure confining both phases was formed. These additions had little effect on the carbides (M 23 C 6 type) present within the laths
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