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用扫描电镜、能谱仪、显微硬度计和剪切试验等方法,研究了以Cu箔为中间层的碳钢/不锈钢双金属瞬间液相扩散结合区组织性能。结果表明,以Cu箔作中间层,采用冷拔-瞬间液相扩散复合法可实现碳钢与不锈钢之间的良好冶金结合,结合区抗剪强度可达到300 MPa以上。在铜/不锈钢界面,铜液沿不锈钢奥氏体晶界扩散,形成残余“孤岛”奥氏体组织分布于铜基体中;在碳钢/铜界面,沿界面形成连续的岛状富铁相,然后呈枝晶状向铜中间层有向生长;在一定温度和时间范围内随扩散时间延长或扩散温度升高,结合区富铁相增多,结合区硬度提高,抗剪强度也进一步提高。
The microstructure and properties of instantaneous liquid phase diffusion bonding zone of carbon steel / stainless steel bimetallic with Cu foil as interlayer were investigated by scanning electron microscopy, energy dispersive spectrometer, microhardness tester and shear test. The results show that the Cu - Fo foil can be used as the intermediate layer, and the cold metallurgy - transient liquid phase diffusion method can be used to achieve good metallurgical bonding between the carbon steel and the stainless steel. The shear strength in the bonded zone can reach over 300 MPa. At the copper / stainless steel interface, the copper liquid diffused along the austenite grain boundaries of the stainless steel to form a residual “island” austenite structure distributed in the copper matrix; at the carbon steel / copper interface, a continuous island- Phase followed by dendrite growth toward the copper intermediate layer. With the extension of diffusion time or diffusion temperature and the increase of iron-rich phase in the binding zone and the increase of the hardness in the bonding zone, the shear strength is further increased in a certain temperature and time range .