TC4大尺寸锻件锻造数值模拟及工艺优化

Process optimization and numerical simulation of forging for large size TC4 forgings

钛以其优异的性能在航空航天、舰船、石化等领域的应用获得迅速发展,并在多个领域逐步取代不锈钢和部分有色金属,因此有必要对钛及其合金锻压工艺进行研究。本文通过改进前后的锻造工艺研究了锻造方式对锻件组织的影响,通过Deform-3D软件进行了有限元模拟实验,与实际锻造结果截取方料的金相组织照片进行比对,分析了锻件成形的应力、应变及金属流动规律。研究结果表明,通过β化处理、淬火、锻造方式的改变能有效改善中大规格的棒材组织不均匀性,得到倍组织均匀、细小的球状或短杆状α组织,使后续加工的钛合金棒材具有良好的力学性能。

Titanium, with outstanding performance, has rapid development in the field of application of aerospace, ships, petrochemicals, etc. , and gradually replaces stainless steel and some non-ferrous metals in many fields, so it is necessary to study the forging process for titanium and its alloys. The effects of forging process before and after improvement on the microstructure of forgings were studied. Compared the metallographic structure of stock obtained from actual forgings with simulation experiments obtained by Deform-3D, the information of the stress, strain and metal flow in forging process were obtained. The results show that the microstrueture inhomogeneous of largesize bars can be improved by employing the β transformation heat treatment with a quenching subsequently and changing the type of forging process, the homogeneous microstructure with fine spherality or short rhabditiform α structure was obtained, which makes the subsequent processing TC4 bars have good mechanical performances.