Li Zhiqiang, Qu Haitao, Chen Fulong, Wang Yaoqi, Tan Zinong, Kopec Mateusz, Wang Kehuan, Zheng Kailun
Metal Forming Technology Department, AVIC Manufacturing Technology Institute, Beijing 100024, China.
Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK.
Materials (Basel). 2019 Jan 10;12(2):223. doi: 10.3390/ma12020223.
Near- α titanium alloys have extensive applications in high temperature structural components of aircrafts. To manufacture complex-shaped titanium alloy panel parts with desired microstructure and good properties, an innovative low-cost hot stamping process for titanium alloy was studied in this paper. Firstly, a series of hot tensile tests and Scanning Electron Microscope (SEM) observations were performed to investigate hot deformation characteristics and identify typical microstructural evolutions. The optimal forming temperature range is determined to be from 750 °C to 900 °C for hot stamping of TA15. In addition, a unified mechanisms-based material model for TA15 titanium alloy based on the softening mechanisms of recrystallization and damage was established, which enables to precisely predict stress-strain behaviors and potentially to be implemented into Finite Element (FE) simulations for designing the reasonable processing window of structural parts for the aerospace industry.
近α钛合金在飞机高温结构部件中有着广泛应用。为制造具有所需微观结构和良好性能的复杂形状钛合金板件，本文研究了一种创新的低成本钛合金热冲压工艺。首先，进行了一系列热拉伸试验和扫描电子显微镜（SEM）观察，以研究热变形特性并识别典型的微观结构演变。确定TA15热冲压的最佳成形温度范围为750℃至900℃。此外，基于再结晶和损伤软化机制，建立了TA15钛合金统一的基于机制的材料模型，该模型能够精确预测应力-应变行为，并有可能应用于有限元（FE）模拟，以设计航空航天工业结构部件的合理加工窗口。
