Abstract
Fracture toughness properties of a simulated weld coarse grain heat affected zone (CGHAZ) in a newly developed 785 MPa grade high strength low alloy (HSLA) steel were investigated at different loading rates and a series of temperatures. It is indicated that the fracture toughness KIc is a single‐value function of the parameter ΔH=kT In (A/ε̇), implying that just like the plastic deformation, the event of fracture initiation is also controlled by dislocation thermal activation movement.
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