Establishment of Constitutive Equation of Hot Deformation of Ti-6Al-4V-0.1B alloy with Widmannst?tten structure

[摘要] In order to study the hot deformation behavior of the Ti-6Al-4V-0.1B alloy with Widmannstätten structure and obtain its constitutive equation,the Ti-6Al-4V-0.1B alloy cylindrical specimens with size of Φ8 × 12mm were prepared for the hot compression test on the Gleeble-1500 simulation machine,the deformation temperature from 850 to 980°Cand strain rates of 0.01 to 1s-1.The true stress-strain data and curves were obtained from the hot compression test.The results show that the true stress-strain curves of Ti-6Al-4V-0.1B alloy with Widmannstätten structure have the characteristics of flow stress softening and the flow stress is sensitive to temperature and strain rate.At the same temperature, flow stress increase with the strain rate.At the same strain rate, flow stress decrease with the temperature.Through regression analysis of true stress and strain data by Arrhenius hyperbolic sine function, the activation energy Q is calculated, 890.49kJ/mol.Under the range of the experimental deformation temperatures and strain rates, the constitutive equation is σ=11.36ln{(Z/e88.47)1/4.4107+[(Z/e88.47)2/4.4107+1]1/2}.

[发布机构] State Key Lab of Nonferrous Metals and Processes, GRINMAT Engineering Institute Co, Ltd., Beijing, China^1;China International Engineering Consulting Corporation, Beijing, China^2;Beijing Trillion Metals Co., Ltd, Beijing, China^3

[效力级别] 材料工程

[关键词] Cylindrical specimens;Deformation temperatures;Experimental deformation;Flow stress softening;Hot deformation behaviors;Ti-6al-4v-0.1b alloys;True stress strain curve;True stress-strain