Abstract
Failure behavior of SA508-3/EQ309L overlay weld interface was analyzed. Residual stress measurement showed weld interface was in low stress state at transverse and longitude directions. SA508-3/EQ309L interface was a typical sandwich structure containing a white bright band ended with multi micro-voids type-II boundary. Element changes little around type-II boundary, but hardness varied a lot. The property difference and feature of multi voids made type-II boundary unstable, affecting weld property significantly. Induced shear and tensile tests were applied to study type-II boundary behavior. Under shear stress, type-II boundary suffered work hardening while under tensile stress, type-II boundary cracked first before EQ309L necking. Energy Dispersive Spectrometer (EDS) showed little element variation around type-II boundary. Electron Back-Scattered Diffraction (EBSD) indicated that most part of type-II boundary was ∑3 CSL grain boundary. Under tensile stress, dislocations crossed the boundary, leading to further stress concentration, so as to make the boundary crack under low positive stress.
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