A Study on Factors Controlling Critical COD Value of Welded Joints of High-Tensile Strength Steels

Influence of martensite-austenite (MA) on impact toughness of X80 line pipe steels

“…Research has shown that precipitation of carbide and ferrite could occur from MA when a third thermal cycle is used with a peak temperature between 300 and 600°C, and there could be improvement in toughness [9,24,27,31]. A third thermal cycle could also transform part of the retained austenite into martensite [14,30].…”