Abstract
The static fracture toughness KIC and dynamic fracture toughness KId of SN490, its pre-strained steel, and its welding heat affected zone were measured. KIC tests were conducted according to the ASTM standard, and KId tests were carried out on an instrumented Charpy impacting machine. The experimental results were used to determine the effects of welding thermal cycle and cold working. It was found that both welding heat input and cold working are harmful to the fracture toughness of SN490 steel under both static and dynamic loading. The deleterious effects are serious under static loading. The detrimental effect of welding heat input during submerged arc welding was found to be more significant than that of the 10% plastic prestrain.
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