固溶时效处理对TC4钛合金显微组织及性能的影响OA

In order to expand engineering application ranges of TC4 titanium alloy with α+β dual-phase,its microstructure and mechanical properties need to be precisely controlled.Taking forged TC4 as the research object,this study aims to optimize its strength-plasticity synergy.Systematically investigated were the effects of three cooling methods(water cooling,air cooling,and furnace cooling)following solution treatment at 920℃(40 min),as well as aging treatments at 500℃,550℃,and 600℃for 3 h after water-cooled solution treatment,on the alloy's microstructure and mechanical properties.Microstructural evolution was observed using optical microscopy(OM)and scanning electron microscopy(SEM),while mechanical properties were characterized via room-temperature tensile tests.The results indicate that solution cooling significantly influences the alloy's microstructure.Air cooling induces a stable bimodal microstructure composed of equiaxed primary α grains and lamellar α phases,endowing the alloy with optimal comprehensive mechanical properties.After water-cooled solution treatment,secondary α phases and lamellar α grains gradually coarsen with increasing aging temperature,accompanied by an expansion of the interlamellar spacing.Among these,550℃is identified as the optimal aging temperature.The alloy achieves the best strength-plasticity balance after combined treatment at 920℃(40 min)water cooling followed by 550℃(3 h)aging,with an ultimate tensile strength of 1022 MPa and an elongation of 13%.This study clarifies the optimal solution and aging parameters for forged TC4,and provides reliable technical references and guidance for microstructure-property regulation and heat treatment process formulation in practical engineering.