Evaluation of microstructure and mechanical properties of annealed SLMed Ti–6Al–4V alloy using laser ultrasonics
Jiazheng Jiang, Yaoxin Huang, Anmin Yin, Yeqing He, Xiaodong Xu, Xuejun Yan, Ying Wang, Tingxiao Tang
Abstract
This paper investigates the relationship between the microstructure of annealed SLM Ti-6Al-4V alloy and ultrasonic eigenvalues. It proposes a mechanism for the interaction between the titanium alloy's microstructure and laser ultrasonic waves. Building on the enhanced Hall-Petch relationship that correlates grain size with mechanical properties, we establish and validate calculation models for yield strength, tensile strength, and hardness based on the ultrasonic time-domain attenuation coefficient, using experimental data for verification. The results indicate that the accuracy of the models linking microstructure and mechanical properties to ultrasonic eigenvalues is approximately 0.85.