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在前期焊接试验参数优化基础上,对TC4+TC17钛合金进行线性摩擦焊,焊后进行不同温度的热处理,并利用光学显微镜、扫描电镜等对不同状态接头组织进行对比分析。结果表明,焊态下接头焊缝为典型动态再结晶组织,热力影响区由于热输入较小,以变形组织为主。585℃×3h热处理后焊缝TC4侧形成弥散的α+β相,细小的针状α相从亚稳态β相析出。热力影响区变形的α相在长度和宽度方向都长大,相界较焊态下更清晰;TC17侧形成细小片层状α相、针状次生α相和β相,次生针状α相沿初生α相析出。热力影响区亚稳β相分解,析出针状次生α相;热处理温度升高到685℃,接头组织的析出相长大粗化,组织趋于稳定。
Based on the optimization of pre-welding parameters, the TC4 + TC17 titanium alloy was subjected to linear friction welding and heat treatment at different temperatures after welding. Optical microscopy and SEM were used to analyze the microstructures of different joints. The results show that the welded joint is a typical dynamic recrystallization microstructure, the heat affected zone due to heat input is small, the main deformation. After heat treatment at 585 ℃ for 3h, the dispersed α + β phase was formed on the TC4 side of the weld, and fine acicular α phase precipitated from the metastable β phase. The deformed α phase in the heat affected zone grows in both length and width directions, and the phase boundary is clearer than the welded state. The fine lamellar α phase, acicular secondary α phase and β phase, secondary acicular α Phase along the primary α-phase precipitation. The metastable β phase was decomposed in the heat affected zone to precipitate the acicular secondary α phase. The temperature of the heat treatment increased to 685 ℃, and the precipitated phase of the joint became coarse and coarse, the organization tended to be stable.