An Atlas of Continuous Cooling Transformation (CCT) Diagrams Applicable to Low Carbon Low Alloy Weld Metals (Matsci) - Tapa dura

This atlas is a response to the increasing demand for weld metals of high toughness at low temperatures with the appropriate microstructures. These diagrams will assist welding engineers, welding metallurgists and welding-consumables designers in industry as well as those investigating steel weld metal phase transformation kinetics.

Since the pioneering studies on continuous cooling transformation (CCT) diagrams carried out by Christenson and others were published almost 50 years ago, many hundreds of CCT diagrams have been constructed throughout the world to describe the (gamma-alpha) transformation kinetics of most grades of commercial steels. However, since the mid-1970s, increasing demands for weld metals of high toughness at low temperatures with the appropriate microstructures has produced the requirement for a more systematic and detailed study of transformation kinetics and mechanical properties of low alloy weld deposits. This resulted in a number of CCT diagrams which were directly applicable to weld metals and these have significantly improved our understanding of weld metal microstructural development and the effects of different factors, such as chemical composition, oxygen content (thus size distribution and population of inclusions), welding parameters (e.g. cooling rate) and prior austenite grain size, on the (gamma-alpha) transformation behaviour of weld metals. It is therefore of both practical as well as academic importance to draw together an atlas of CCT diagrams applicable to low carbon low alloy weld metals, as this book has done. It is hoped that these diagrams will be of assistance to welding engineers, welding metallurgists and welding-consumables designers in industry. At the same time, they will also prove useful to those in academia who are involved into investigations of steel weld metal phase transformation kinetics.