The Occurrence of Massive Ferrite in the Heat Affected Zones of Some Welded High-Strength Structural Steels Corroding in Sea Water

摘要

Heavy local corrosion has been reported to occur close to welding joints in high-strength structural steels when used without protection in sea water. Such corrosion damage has been investigated in detail in several steels where high strength combined with weldability is aimed at by means of high manganese and low carbon contents. To obtain additional information on the phenomenon, the zones affected by welding heat in these steels were studied by the authors in an electron microscope. The results, on which a preliminary report is given below, indicate that the heavily corroding areas in the heat affected zones consist predominatingly of massive ferrite. (Author)