|About this Abstract
||7th World Congress on Integrated Computational Materials Engineering (ICME 2023)
||Effect of Cooling Rates on the Evolution of Microstructure, Phase Transformation, and Strain in Ti-6Al-4V Studied by High Speed Synchrotron X-ray Diffraction
||Rajib Halder, Seunghee Oh, Anthony D Rollett, Andrew C Chuang
|On-Site Speaker (Planned)
The laser melting process involves rapid evolution of microstructure, phase transformation, temperature history and strain due to its high heating as well as cooling rates. In this study, high speed synchrotron X-ray diffraction technique was utilized to investigate the effect of cooling rates on phase transformation and on the evolution of temperature history, and strain in Ti-6Al-4V during in-situ laser melting process. Different cooling rates were achieved by designing multi-pass scans (back & forth) with different delay times between passes. The high temporal and spatial resolution available in the measurement enabled us to study various microscale phenomena that occur during rapid evolution of the small fusion zone. Microstructural features were probed using optical and scanning electron microscopy. Thermal history, cooling rate, and strain were estimated based on changes in the lattice spacing resulting from the thermal contraction upon solidification.