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针对航空发动机钛合金整体叶盘的典型材料TC11和TC17进行线性摩擦焊,并对焊接接头进行热处理,用光学电镜、扫描电镜观察分析焊接接头的微观组织。结果表明:线性摩擦焊接头焊缝区为典型再结晶组织,TC11侧为马氏体组织,TC17侧为亚稳态β相组成;热处理后,TC11侧马氏体组织转化为α+β片层组织,TC17侧亚稳态β相内析出针状α相且针状α相随着热处理温度升高而长大;热处理前TC11侧热机影响区B晶界长出极细针状次生理相,随后热处理过程中极细针状次生α相消失并有细小颗粒状次生α析出,而TC17侧热机影响区在热处理前初生α相呈一定流线型,热处理后针状初生α相长大并有不同取向的α相析出。
Aiming at the TC11 and TC17, the typical material of the titanium alloy blade of aeroengine, the welded joints were heat-treated. The microstructure of welded joint was analyzed by optical microscope and scanning electron microscope. The results show that the weld zone of the linear friction welding joint is a typical recrystallized structure with martensite on the TC11 side and metastable β phase on the TC17 side. After heat treatment, the martensite on the TC11 side is transformed into α + β sheet In the metastable β phase of TC17, acicular α phase and acicular α phase grew up with the increase of heat treatment temperature. The fine grain-like secondary phase grew in B grain boundary of the heat affected zone before TC11, Subsequent fine needle-like secondary α phase disappeared and fine granular secondary α precipitated during the heat treatment, whereas the primary α-phase in the heat affected zone on TC17 side showed a streamlined shape, and the primary α-phase grew up after heat treatment Α-phase precipitation with different orientations.