不同热处理工艺对TC6大规格棒材组织和性能的影响OA

This article investigates the influence of three different heat treatment processes,including double annealing,iso-thermal annealing,and solution aging,on the microstructure,room temperature tensile properties,impact toughness and fracture toughness of TC6 titanium large-sized bars after undergoing the same forging process deformation.The results indicate that The microstructure of double annealing,iso-thermal annealing,and solid solution aging is composed of primary phase α,phase β and secondary phase α.The secondary layer phase α of iso-thermal annealing is the coarsest,while secondary layer phase α of solution aging is the thinnest.After solution aging,the TC6 titanium bars has the highest strength,with room temperature tensile strength of up to 1264 MPa,and yield strength of up to 1127 MPa,but with the worst plasticity.After iso-thermal annealing,the strength of TC6 titanium bars is the lowest,but the plasticity is the highest,with an elongation rate of 23％and a reduction in area of 55％.The impact toughness and fracture toughness of isothermal annealing state are the highest,reaching 60.4J/cm2 and 101MPa·m1/2 respectively.After double annealing,TC6 large-sized bars can achieve a good match between strength and plasticity.