Abstract

This work is a continuation of the studies of the possibility of formation of a one-piece blisk unit for gas turbine engines by solid-phase pressure welding (PW) of a single-crystal [001] Ni₃Al-based VKNA-type blade alloy with a wrought EP975 disk nickel superalloy. The influence of the PW temperature at a strain of 10 and 24% on the structure and mechanical properties of welded specimens at room temperature is investigated. An increase in the process temperature by 50°C to 1175°C is shown not to change the structure of the VKNA-25 alloy, and the γ-phase grain sizes in the EP975 alloy increase from 7–8 to 15–18 μm. During tensile tests, the welded specimens fail through the VKNA-25 alloy, and the strength of the welded specimens fabricated at 1175°C is almost twice as high as that of the specimens fabricated by PW at 1125°C at the same strain of the EP975 alloy. Electron backscatter diffraction (EBSD) analysis of the solid-phase bonding zone demonstrates that the VKNA-25 alloy retains its single-crystal structure.

中文翻译：

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锻造EP975镍合金和单晶金属间VKNA-25合金的压力焊接温度对焊接接头组织和性能的影响

摘要

这项工作是对通过单晶[001] Ni _3的固相压力焊接（PW）形成用于燃气涡轮发动机的一体式叶轮单元的可能性的研究的继续。铝基VKNA型刀片合金，带有锻造的EP975圆盘镍超合金。研究了在10％和24％应变下的PW温度对室温下焊接试样的结构和力学性能的影响。将加工温度提高50°C至1175°C不会改变VKNA-25合金的结构，EP975合金中的γ相晶粒尺寸从7–8增大至15–18μm。在拉伸试验中，焊接的试样无法通过VKNA-25合金，在相同的应变下，在1175°C下制造的焊接试样的强度几乎是在1125°C下通过PW制造的试样的强度的两倍。 EP975合金。固相结合区的电子背散射衍射（EBSD）分析表明，VKNA-25合金保留了其​​单晶结构。