Abstract
Charpy impact toughness of 10CrNi3MoV steel weld joint was investigated, and microstructure and fracture behavior were considered as reasons for differences in Charpy impact toughness. Charpy impact toughness of fusion zone (FZ) was lower than that of heat affected zone (HAZ) due to combinations of microstructure and fracture behavior. Acicular ferrite (AF) and grain boundary ferrite (GBF) with granular bainite (GB) in columnar dendrite pattern of FZ and a mixed mode of quasi cleavage fracture and ductile fracture was responsible for the low toughness; while tempered martensite with some bainite in fine dispersed equiaxed dendrite pattern of HAZ was contributed to absorb crack energy and improve the toughness. Tortuous crack propagation path of zigzag pattern confirmed the crack deviated at large angle grain boundary and depressed crack growth.
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