Research On Manufacturing Technology Of Additives For High Energy Beam Titanium And Titanium Alloy

Natural shell material structure match great mechanical properties.Shell nacre is a laminated composite structure with soft material and hard material.It has high strength,high toughness and good mechanical properties.This kind of structure provides a new idea for the design and manufacture of high strength and toughness bionic material.The subject used the design of the shell structure for reference,designed to be strong impact,high strength,high tough composite material.In the experiment,selected TC4 correspongding to the hard materials in the shell and TA2 to the soft materials.The plasma arc deposition was firstly used to study the influence of the process parameters on the forming,and tested the microstructure and the performance with the thin-wall framing.Three different deposition programs are as followed:TC4 deposition,TC4 and TA2 layer deposition alternately,and TC4 and TA2 road deposition alternately.The best comprehensive mechanical properties program is selected and deposited by electron beam fuse,plasma and electron beam are comparatively analyzed mechanical properties of forming in different ways.The results show that the influence of process parameters on the forming of TC4 and TA2 are investigated respectively based on plasma fuse additive manufacturing technology.The process parameters are as follows:welding current 120A,moving speed 30 mm/s,wire feed speed 1.4 mm/s(TC4),1.2 mm/s(TA2),TC4 and TC4 overlap rate of 36.3%,TA2 and TA2 lap 35.2%,TC4 and TA2 lap 35.7%;Electron beam fuse additive manufacturing technology.The effects of process parameters on the forming of TC4 and TA2 were investigated respectively.The process parameters were as follows:the accelerating voltage was 60 KV,the focusing current was 659 mA,the moving speed was 1 mm/s,the feeding speed was 5 mm/s,current 10 mA(TC4),9 mA(TA2);TC4 and TC4 lap 40%,TA2 and TA2 lap 38.4%.Formed TC4 microstructure is divided into heat affected zone,gradient circulating tissue zone,uniform zone.The bottom of the deposited sample is columnar grains grown from bottom to top,and the columnar grain plays a very important role in the anisotropy of the sample.The microhardness of the shaped sample substrate is less than the heat affected zone less than the gradient circulating tissue,the microhardness of the uniform tissue zone is less than the gradient circulating tissue zone.The mechanical properties of bulk samples are anisotropic.The impact resistance of the block in the Z-axis direction is higher than other two directions.After the bionic program adds the block,the impact toughness of the block is higher than the TC4 block.When the block is impacted,the crack encounters the TA2 absorption of a large amount of energy,as the soft phase will make the deflection of the crack,which alternately deposited between the TC4 and TA2 layer in the Z-axis direction of the highest impact resistance;tensile fracture and impact fracture tough ductile fracture.The mechanical properties of the electron beam forming samples are similar to the plasma arc forming samples.After the electron beam deposition of alternating samples between TC4 and TA2 layers,the tensile strength,impact resistance toughness has improved,achieving an increase in impact toughness without reducing the tensile strength.