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Study on Microstructure and Property in Heat-Affected Zone of X80 Pipeline Steel

Experimental methods, such as OM, TEM and property testing, were used to study the HAZ microstructure and property of X80 pipeline steel. HAZ can be divided into three regions, such as coarse grain zone, transition zone and fine grain zone. Granular bainite of CGHAZ consists of bainite ferrite (BF) lath and M/A constituents. Charpy impact energy of the HAZ is much lower than that of base metal, for the grain size of CGHAZ is much larger than that of BM, and crack formation and propagation of granular bainite is easy.