![]() The HAZ samples contained 4% grain boundary ferrite at all heat inputs, while the Gleeble ferrite content varied from nil at 3 kJ/mm to 6.6% at 6 kJ/mm. The main difference between the HAZ and Gleeble microstructures was in the amount of grain boundary ferrite. The influence of microstructure and precipitation on fracture toughness was addressed by examining the microstructures for each of the heat inputs. The toughness at the temperatures corresponding to the 0.1 mm CTOD temperature is controlled primarily by the microstructure at the point of fracture initiation and, to a lesser degree, by precipitation of microalloy carbides and nitrides ( 9). For the Gleeble results, the lowest 0.1 mm CTOD temperature was obtained for the 3 kJ/mm samples, while the highest temperature was measured for the 6 kJ/mm heat input equivalent. ![]() The 0.1 mm temperatures ranged from−65☌ to 0☌ for the HAZ samples, compared to−25☌ to−5☌ for the Gleeble samples. The 0.1 mm CTOD temperatures of the HAZ samples increased with heat input from 3 to 5 kJ/mm, and the toughness improved between 5 and 6 kJ/mm. ![]() Lazor, in Welding for Challenging Environments, 1986 Fracture Toughness Results
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