Fracture Toughness of Welded Joints made of UHSS Steel with a Yield Strength of 960 Mpa

摘要

Typically, the fracture toughness of welded joints are evaluated usingCharpy-V tests. This method has been sufficient for traditional steels,which obey Charpy-T0 correlation. In recent years ultra-high-strengthsteel (UHSS) has come to market in which the Charpy correlation is notreliable.To validate the weld toughness of two different types of UHSS, fracturetests were performed according to ASTM procedures on different portionsof weld and heat affected zones (HAZ) as well as the base material.The results show that when using the proper heat input during weldingthe fracture toughness is appropriate in the weld area. Naturally theseresults are valid only for the tested steel grades and cannot be used withother UHSS products.