Study Of Consecutive Point-mode Forgine And Laser Rapid Forming Microstructure And Mechanical Propeties Of Functionally Gradient Material Of TC11 Titanium Alloy

TC11 titanium alloy is a kind of ? + ? titanium alloy,the nominal composition of it is Ti-6.5 Al-3.5Mo-1.5Zr-0.25 Si.The alloy has excellent thermal strength and creep resistance,with excellent comprehensive mechanical properties,which is one high temperature titanium alloy are used widely in spaceflight engine of our country.Based on the consecutive point-mode forging and laser rapid forming technology,this artical has formed three press the amounts workpiece,which is 0.1 mm ? 0.2 mm and0.3mm.Respectively use this TC11 titanium alloy gradient forming as the research material.And study the organization and the mechanical properties of the difference;Compared with the TC11 titanium alloy formed by the traditional forging technology,the comparative analysis method was verified by the macroscopic mechanical properties test with the prediction of microstructure properties.The microstructure differences and mechanical properties of gradient materials are systematically studied and analyzed.Analysis the original organization of each press the amount and the gradient of different heat treatment system of the microstructure.The research results show that the gradient materials mentioned in the present experiment process conditions forming the original microstructure are isometric,grain boundary are slender and continuous.With the increment of press the amount,grain size gradually well-distributed and refining,strength gradually increased,the plastic gradually becomes poor.Compared to the original organization of the traditional forging TC11 titanium alloy,its strength is higher,but its plastic is poorer.Studied the same amount of press forming of different solid solution temperature,the results showed that with the increase of solution temperature,intracrystalline primary ?phase content reduce,? balling phenomenon obviously,grain size increases gradually,the intracrystalline secondary ? phase gradually become small dispersion.After heat treatment,the forming organization which is formed by the conditions of this test process both have the advantages of the shaft and lamellar structure.Compared to the conventional forgingthe strength is slightly taller,plasticity is slightly poorer.and the comprehensive mechanical properties are excellent.With the increase of solid solution treatment temperature,the comprehensive mechanical properties of TC11 titanium alloy materials have the trend of increasment.Studied the three kinds of press parts respectively at the same temperature gradient material,forming single annealing and double annealing and solid solution aging temperature.At the same solution aging temperrature,with the increasment of the amount of press,grain boundary gradually broken and spheroidizing,internal organization organized gradually transtion from basket-weave microstructure to equiaxed structure.The primary ? phase has become from thin strips to spheroidizing.Under the same amount of press,with the increasment of the solid solution aging treatment,the primary content of ?phase and gradually decrease,the grain size increases gradually.