“粉冶-铸-锻”联合体的塑性变形与微观结构

实现盘缘与盘心异种变形高温合金的高强冶金连接是制造双合金涡轮盘的关键。本研究选择粉末高温合金为盘缘材料、变形高温合金为盘心材料，采用电子束焊接盘缘与盘心。电子束焊接后的焊缝区域不仅具有两种母材的结构特征（即粉末高温合金和变形高温合金的结构特征），而且焊缝区存在明显的铸造组织。两种高温合金材料电子束焊接后形成了组织特征鲜明的“粉冶-铸-锻” 结构。本文首次研究了“粉冶-铸-锻”的变形行为，并重点探讨了焊缝的组织演化规律。相关研究结果不仅丰富了异种高温材料连接区的增强方法与组织控制方法，而且为发展双合金等温变形技术提供了科学依据。

Plastic deformation and microstructures of powder/metallurgy-solidified-wrought complex structure

How to improve the combines strength of bore and rim materials becomes most critical and practical problem for manufacting dual-alloys turbine disk. This research tried to address this issue. In this research, wrought superalloy GH4133B with equiaxed grains has been chosen as bore material and P/M superalloy FGH4096 with PPB nets has been chosen as rim material for dual-alloys turbine disk in present research. Electron beam welding was conducted on as-polished superalloys, and P/M-solidified-wrought (P/M-S-W) complex structure was obtained. Cylindrical compression specimens were machined from the central position of P/M-S-W complex structure. A series of isothermal compression tests were conducted on a thermo-simulation machine. Based on the compression results and the related analyses, plastic deformation and microstructure evolution of P/M-S-W complex structures have been investigated. This research has great effect on improving microstructure controlling theory and developing isothermal deformation technology for dual alloys.