The microstructures developed in the heat affected zone of low alloy steel weldments are critically dependent upon the alloy composition and the thermal cycles introduced by the welding process. Review of available literature indicates that although a significant amount of research has been performed examining microstructural development, the bulk of this work has either been aimed at steels for low temperature application or has been used to overcome reheat cracking in ½ Cr- ½ Mo- ¼ V steels. In general it appears that the measures taken to prevent reheat cracking which occurs early in the life of a weld, i.e., limiting the carbon and vanadium content and adopting procedures which result in significant refinement of weldment structures, may well have been responsible for promoting the long term, in-serve creep damage. Thus in the present programme, research has concentrated on establishing the factors affecting the formation of austenite on reheating, the growth of these austenite grains as well as considering microstructural transformations on cooling with the view to optimising both short term and long term performance.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:639121 |
| Date | January 1997 |
| Creators | Storer, S. M. |
| Publisher | Swansea University |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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