Deformation processing in superplasticity regime-production of aircraft engine compressor discs out of titanium alloys
Deformation processing in superplasticity regime-production of aircraft engine compressor discs out of titanium alloys
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DOI：
10.1016/s0921-5093(97)00790-9
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发表时间：
1998-03
期刊：
影响因子：
6.4
通讯作者：
M. Somani;R. Sundaresan;O. Kaibyshev;A. G. Ermatchenko
中科院分区：
文献类型：
--
作者：
M. Somani;R. Sundaresan;O. Kaibyshev;A. G. Ermatchenko
超塑性变形（SPD）利用了合适合金中固有的超塑性，已被用于开发用于喷气发动机的压缩机盘，该压缩机盘由等同于IMI-685的钛合金制成。通过适当修改工件的微观结构而在SPD范围内变形，使得能够在相对较低的成形载荷下成形为近净形状。用于变形处理的设备包括一台带有加热坯料机器人处理的电炉、一台带有速度和载荷数控装置的2000吨等温锻造压力机以及一个用于锻造盘受控冷却的冷却站。通过在α+β区进行适当的变形，可以使原始组织主要由β晶界内的α板条组成的锻坯细化为细小的等轴α晶粒。细化的组织使得能够在低变形载荷下在α+β相区内进行等温锻造。研究了SPD和随后的热处理对圆盘性能各向同性的影响。介绍了该盘的锻造特点、显微组织和力学性能。可以看出，SPD是一种实用的方法，它能够制造出形状独特且使用可靠的高质量物品。该工艺可用于批量生产具有特定冶金性能的零件。
Superplastic deformation (SPD) that utilizes the inherent superplasticity in suitable alloys has been employed for developing compressor discs for a jet engine in a titanium alloy equivalent to IMI-685. Deformation in the SPD regime by appropriate modification of the microstructure of the workpiece has enabled forming to near-net shape at comparatively lower forming loads. The equipment used for the deformation processing includes an electric furnace with robotic handling of heated billets, a 2000 ton isothermal forging press with numerical controls for speed and load, and a cooling station for controlled cooling of forged discs. The starting microstructure of the forging stock consisting of mainly α laths within prior β boundaries was refined to fine equiaxed α grains by appropriate deformation in the α+β regime. The refined structure enabled isothermal forging in the α+β phase field at low deformation loads. The effect of SPD and subsequent thermal treatment on the isotropy of properties in discs has been studied. The forging characteristics, and the microstructure and mechanical properties realized in the discs are presented. It is seen that SPD is a practical method which enables high quality items to be made that are unique in form and reliable in use. The process can be used in a serial production of parts of specified metallurgical properties.