Asynchronous recrystallization in LPBF GH5188 alloy driven by asymmetric driving force and Zener pinning

Key Points

• The aim is to investigate the non-uniform recrystallization behavior of the LPBF GH5188 alloy and identify the driving forces behind it.
• Calorimetry with derivative analysis to understand grain behaviors
• Electron backscatter diffraction (EBSD) for analyzing grain orientations and distributions
• Assessment of melt pool geometry and its effects on recrystallization
• Recrystallization is initiated in core grains (<100>), while peripheral grains (<101>/<111>) exhibited delayed responses.
• Core grains possess higher stored energy compared to peripheral grains, impeding uniform recrystallization.
• A proposed RX-based metric aims to improve partial recrystallization, enhancing the strength and ductility of the alloy.

Abstract