The correlation between microstructure and dynamic mechanical property of heat treated β20C titanium alloy based on different forging processes
As a new material, the microstructure of β20C titanium alloy can match well with property by forging process.However, the microstructure of billet is inhomogeneous in actual forging.For ensuring microstructures homogenization, two forging processes are designed.Process 1 is large deformation above the phase transition (T=1050℃, 70% deformation) and small deformation in two-phase region (T=860℃~890℃, ≤40% deformation).Process 2 is small deformation above the phase transition (T=1050℃, 40% deformation) and large deformation in two-phase region (T=860℃~890℃, 50%~60% deformation).Then microstructures are observed and dynamic compressive strength and the critical fracture strain of samples are test after solid-solution treatment.It turns out that the homogeneity of microstructure of process 2 is improved by heat treatment.The microstructure is lamellar microstructure with 1650MPa dynamic strength and 15% critical fracture strain through Process 1 + 840℃ 1h/FC while the microstructure is equiaxed microstructure with 1650MPa dynamic strength and 20% critical fracture strain through Process 2 + 840℃ lh/FC.In conclusion, the microstructure of large deformation in two-phase region can accumulate more deformation energy which is beneficial for dynamic recrystallization.
β20C titanium alloy forging heat treated dynamic mechanical property
Huo Lirui Fan Qunbo Gao Ruihua Miao Cheng
National Key Laboratory of Science and Technology on Materials under Shock and Impact (China);School School of Materials Science and Engineering, northwestern Polytechnical University, Xian 710072 (Ch
国际会议
北京
英文
108-114
2014-10-19（万方平台首次上网日期，不代表论文的发表时间）