Abstract
The microstructure of welding seam was characterized by optical microscope and SEM,and then of which the effect on crack propagation was studied by means of situ tensile test in SEM and EBSD technique for a nuclear grade stainless Z3CN20-09 M.The results show that the weld seam composes of lath- shaped and island- like microstructures and different microstructures exhibited different resistance to crack propagation.Island-like microstructure has a strong resistance to the crack propagation,which can induce a deflection of the path way of crack propagation; while lath-shaped structure showed little effect on crack propagation,and the crack passed though the lath- shaped microstructure quickly without any deflection.
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