热压扩散焊接法制备钛-钢复合材料及性能研究

Performance of Ti-Fe Composite Prepared by Hot-pressing Diffusion Welding Method

利用热压扩散焊接法法制备钛一钢复合材料。采用用扫描电镜、EDS分析、拉剪试验和三点弯曲试验等方法，研究了扩散焊接温度对钛一钢复合界面附近形貌、成分、界面剪切强度和弯曲性能的影响。结果表明：热压扩散焊接法在压力3MPa，真空度≥10-3Pa，保温时间1h，焊接温度≥820℃的条件下，有Ti、Fe原子相互扩散，可实现冶金结合；在焊接温度≥740℃条件下，钛钢界面的拉伸剪切强度都大于基体强度；在740～840℃的焊接温度下，抗弯曲性能随温度升高而先增大后减小，800℃的抗弯曲性能最强，达到29．71MPa。

Ti-Fe composite was prepared by hot-pressing diffusion welding method. The effects of diffusion welding temperatures on the microstructure, ingredient, bond shear strength and bending performance of Ti-Fe interface were examined by SEM and EDS, tensile shear strength test and three-point bending test. The results show that the metallurgical bonding of Ti and Fe can be achieved and the atomic interdiffusiun between Ti and Fe can be realized by hot-pressing diffusion welding method under the conditions of the pressure of 3MPa, vacuum ≥ 10-3 Pa, holding time for lh, soldering temperature ≥ 820 ℃. The interface shear strength of Ti and Fe is greater than the tensile strength of the matrix under the conditions with the soldering tempreture ≥ 740 ℃. With the temperature increasing, the anti-bending performance increases from the beginning and then decreases under the condition of the soldering temperatures at 740-840℃. The anti-bending performance is strongest at 800 ℃, which is 29.71 MPa.