连续点式锻压激光快速成形TC11钛合金的组织和力学性能

发布时间：2018-11-29 14:03

【摘要】：采用连续点式锻压激光快速成形技术进行了TC11钛合金厚壁零件成形实验,利用OM、SEM等手段研究了连续点式锻压激光快速成形TC11钛合金的组织和力学性能。结果表明,TC11钛合金试样内部的等轴晶晶粒尺寸均匀,平均晶粒尺寸48.7 mm。等轴晶的晶界α相连续,晶内是初生α相板条+β转变组织组成的双态组织。在连续点式锻压激光快速成形过程中,连续点式锻压时,TC11钛合金厚壁零件的表层变形区深度约为1.5 mm,变形量为20%。在连续点式锻压冷变形TC11钛合金上表面沉积新层过程中,当激光束扫描经过时,熔池热影响区中约1 mm厚(4层)冷变形TC11钛合金被加热到钛合金β转变温度之上,并在0.86 s内完成再结晶。力学性能结果表明,与TC11钛合金锻件相比,连续点式锻压激光快速成形的TC11钛合金的强度高,而塑性低。断口形貌分析表明,晶间断裂是导致TC11钛合金塑性差的主要原因。
[Abstract]:The forming experiments of thick wall parts of TC11 titanium alloy were carried out by means of continuous point forging laser rapid prototyping. The microstructure and mechanical properties of TC11 titanium alloy were studied by means of OM,SEM and so on. The results show that the equiaxed grain size of TC11 titanium alloy is uniform and the average grain size is 48.7 mm.. The grain boundary 伪 phase of the equiaxed crystal is continuous, and the primary 伪 phase lath 尾 transition structure is a double state structure within the crystal. In the process of continuous point forging laser rapid prototyping, the depth of surface deformation zone of thick wall parts of TC11 titanium alloy is about 1.5 mm, during continuous point forging. In the process of depositing a new layer on the upper surface of TC11 titanium alloy during continuous point forging cold deformation, when the laser beam is scanned, about 1 mm thick (4 layers) cold deformed TC11 titanium alloy in the heat affected zone of the molten pool is heated to the 尾 transition temperature of the titanium alloy. Recrystallization was completed in 0.86 s. The results of mechanical properties show that compared with TC11 titanium alloy forgings, the strength and plasticity of TC11 titanium alloy with continuous point forging laser rapid prototyping are higher than those of TC11 titanium alloy forgings. Fracture morphology analysis shows that intergranular fracture is the main cause of poor plasticity of TC11 titanium alloy.
【作者单位】：燕山大学先进锻压成形技术与科学教育部重点实验室;
【基金】：国家自然科学基金项目Nos.51375426和51375425~~
【分类号】：TG146.23

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