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进行了钛合金与不锈钢采用铌中间层的真空热轧连接实验,分析了连接界面的显微组织及性能。结果表明,采用铌中间层能够明显提高接头的塑性。当压缩率为25%,轧制速度为38 mm/s,热轧温度为800°C和900°C时,不锈钢与铌的连接界面没有明显的金属间化合物层;当热轧温度为1000°C和1050°C时,不锈钢与铌连接界面形成Fe-Nb金属间化合物层,并且当热轧温度为1050°C时在金属间化合物层与不锈钢之间出现开裂。铌与钛合金连接界面的扩散层厚度随着热轧温度的升高而增大。热轧温度为900°C的连接接头的拉伸强度可达~417.5MPa,拉伸试样断裂于铌中间层,断口呈塑性断裂特征。热轧温度为800°C的热轧过度接头分别与钛合金和不锈钢进行TIG焊接,TIG焊后热轧过度接头的拉伸强度可达~410.3 MPa,拉伸试样断裂于铌中间层,断口呈塑性断裂特征。
The experiment of vacuum hot rolling of niobium intermediate layer between titanium alloy and stainless steel was carried out, and the microstructure and properties of the interface were analyzed. The results show that the use of niobium interlayer can significantly improve the plasticity of joints. When the compressibility is 25%, the rolling speed is 38 mm / s, the hot rolling temperature is 800 ° C and 900 ° C, the interface between stainless steel and niobium has no obvious intermetallic compound layer. When the hot rolling temperature is 1000 ° C and 1050 ° C, the interface between the stainless steel and the niobium forms an Fe-Nb intermetallic compound layer, and cracking occurs between the intermetallic compound layer and the stainless steel when the hot rolling temperature is 1050 ° C. The diffusion layer thickness at the interface between niobium and titanium alloy increases with the hot rolling temperature. Tensile strength up to ~ 417.5MPa for the hot rolled joint at 900 ° C, the tensile specimen fractured in the niobium intermediate layer, the fracture is plastic fracture characteristics. The hot rolled over-hot joint with hot rolling temperature of 800 ° C is respectively TIG welded with titanium alloy and stainless steel. The tensile strength of over-hot joint after TIG welding can reach-410.3 MPa, the tensile specimen breaks in the middle of niobium, Plastic fracture characteristics.