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在真空条件下制备TC4钛合金/304不锈钢双金属复合材料,利用扫描电子显微镜(SEM)、能谱仪(EDS)和显微硬度计对结合区的显微组织和性能进行测试分析。结果表明:当温度为1 025℃、保温60 min时,扩散连接得到的TC4/304双金属复合材料过渡层界面清晰、焊接缺陷较少,结合区的硬度曲线呈先升后降的趋势,峰值硬度为613.5HV;当扩散温度高于975℃时,TC4/304界面处形成A、B、C新相层,A层为混合铁基固溶体,B层主要为Fe_2Ti、FeTi和TiCr_2多元复杂脆性金属间化合物,C层靠近TC4侧为β-Ti基的单相固溶体组织;并且过渡层的厚度随连接温度的升高而递增。
The TC4 titanium alloy / 304 stainless steel bimetallic composite was prepared under vacuum condition. The microstructure and properties of the bonded zone were tested by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and microhardness tester. The results show that the interface of TC4 / 304 bimetallic composite with diffusion bonding is clear and the welding defects are less and the hardness curve of the bonding zone presents the trend of first increasing and then decreasing when the temperature is 1 025 ℃ and the holding time is 60 min. The peak value Hardness of 613.5HV. When the diffusion temperature is higher than 975 ℃, a new phase of A, B and C forms at the interface of TC4 / 304, the A layer is mixed Fe-based solid solution, the B layer is Fe2Ti, FeTi and TiCr_2 multiple complex and brittle metals C-layer near the TC4 side of the β-Ti-based single-phase solid solution; and the transition layer thickness increases with the increase of the connection temperature.