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Progress on rapid hot gas forming of titanium alloys: mechanism, modelling, innovations and applications

机译：钛合金快速热气体成型进展：机理，建模，创新与应用

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摘要

The variable cross-section thin-walled hollow components of titanium alloys are increasingly used in the power and fuel systems of aerospace vehicles, which play an important role in reducing the weight of the structure, improving the service performance and reliability, etc. However, the formability of titanium alloys is very poor at room temperature, so it is very difficult to manufacture the complex thin-walled hollow components. Hot gas forming is an efficient strategy to form integral hollow components of titanium alloys. In this paper, some progress on this forming technology from the author's lab is presented, which includes the deformation mechanisms, constitutive equations, process simulation, technological innovations and typical applications. Based on the research about the deformation mechanisms, the unified constitutive model was developed. Then the deformation process and microstructure evolution of gas forming could be predicted numerically. According to the difficulties of different components with different materials and geometries, new forming process with non-uniform temperature field, new heating system and new tooling strategy were presented. The new technologies were applied to form the components with irregular cross sections and components with large expansion ratios, meeting the application demand of aerospace industry, etc.
机译：钛合金的可变横截面薄壁中空成分越来越多地用于航空航天车辆的电力和燃料系统，在减少结构的重量方面发挥着重要作用，改善了服务性能和可靠性等。室温下钛合金的可塑造性非常差，因此制造复杂的薄壁空心部件是非常困难的。热气体形成是形成钛合金整体中空成分的有效策略。在本文中，提出了来自作者实验室的这种形成技术的一些进展，包括变形机制，本构方程，过程模拟，技术创新和典型应用。基于关于变形机制的研究，开发了统一的本构模型。然后可以在数值上预测气体形成的变形过程和微观结构演化。根据具有不同材料和几何形状的不同部件的困难，提出了具有非均匀温度场，新的加热系统和新工具策略的新型成型过程。采用新技术以形成具有不规则横截面和具有大膨胀比的组件的组件，满足航空航天工业的应用需求等。

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