Abstract
This work revealed the origin of the anisotropic ductility and the dynamic recrystallization-like deformation behavior at elevated temperature of laser powder bed fusion (LPBF) processed Inconel 625. Specimens along horizontal (HOR) and vertical (VER) directions with respect to the build platform were built. Rotation of elongated grains was evidenced by the movement of its low angle rotation axes from <001> towards <112> along <001> ∼ <111> line during deformation. Consequently, geometric hardening and softening accompanied with grain rotation was responsible for the dynamic recrystallization-like flow stress fluctuation during deformation. Moreover, variation of the rotation axes between grains is observed in the HOR specimen, suggesting that the occurrence of compatible deformation between grains is needed. However, intergranular cracks were observed in the HOR specimen, demonstrating grain boundaries embrittlement. Hence, the decrease of ductility of the HOR specimen is originated from incompatible grain deformation when deformation was perpendicular to grain boundaries.
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