摘要
Abstract
Ti-5.1Al-3.1Mo-2.9Cr-0.9Zr alloy has comprehensive high-performance characteristics such as high strength,high plasticity,high toughness,resistance to high-speed impact,fatigue resistance,and dam-age tolerance.It has broad application prospects in the fields of transportation and aerospace.In this study,dif-ferent forging and heat treatment processes(two-phase zone forging and double annealing,quasi-β forging and double annealing,and two-phase zone forging and quasi-β annealing)were applied to the Ti-5.1Al-3.1Mo-2.9Cr-0.9Zr alloy,resulting in three typical microstructures:bimodal,basketweave,and lamellar.Through the microstructure and fracture analysis of room temperature tensile,the relationship between micro-structure and fracture and the correlation between mechanical properties and fracture are analyzed and dis-cussed.The results show that the basketweave structure formed by quasi-β forging+double annealing has the highest room temperature mechanical properties,reaching 1085.7 MPa,yield strength of 956.7 MPa,and elongation of 13.2%,and the lamellar microstructure formed by two-phase zone forging and quasi-β an-nealing has the lowest strength and ductility,with a tensile strength of 956.0 MPa,a yield strength of 853.0 MPa,and an elongation of 9.9%,and the bimodal microstructure formed by two-phase zone forging and double annealing exhibits the best ductility,with a tensile strength of 974.3 MPa,a yield strength of 884.3 MPa,and an elongation of 16.7%.The fracture mechanisms are all ductile fractures,but there are slight dif-ferences in fracture morphologies.The study concludes that the microstructure of titanium alloy is closely re-lated to performance and the heat treatment process is crucial.These conclusions provide theoretical basis and technical support for the application of this alloy in transportation and other fields.关键词
Ti-5.1Al-3.1Mo-2.9Cr-0.9Zr钛合金/显微组织/锻造工艺/力学性能/断裂机制Key words
Ti-5.1Al-3.1Mo-2.9Cr-0.9Zr alloy/Microstructure/Forging process/Mechanical properties/Fracture mechanism分类
矿业与冶金
