Asynchronous recrystallization in LPBF GH5188 alloy driven by asymmetric driving force and Zener pinning
Abstract
The study addresses why LPBF alloys recrystallize non-uniformly using solid solution-strengthened GH5188. Melt pool geometry and remelting partition the build into core and peripheral grain populations, creating asymmetric driving forces and pinning. Calorimetry with derivative analysis resolves a staged pathway. EBSD shows recrystallization initiates in core grains, while / peripheral grains lag. Higher stored energy in the core grains and stronger pinning in the periphery grains, together with orientation heterogeneity and high-angle boundaries, hinder front propagation. An RX-based metric is proposed to guide partial recrystallization for strength ductility synergy.
Fields of Study & Subjects
Metallurgy and Material Forming
Microstructure and mechanical properties
Metal Forming Simulation Techniques
Publication details
- Journal / source
- Materials Research Letters
- Publisher
- Informa UK Limited
- Volume
- 14
- Issue
- 5
- Pages
- 612–621
- Publication date
- 5 March 2026
- Language
- EN