钎焊后冷却制度对铬锆铜合金组织性能的影响

Effect of Cooling System after Brazing on Microstructure and Properties of Cu-Cr-Zr Alloy

针对铬锆铜合金在扩散钎焊液体火箭发动机推力室身部中应用的特殊工况,如何优化扩散钎焊铬锆铜合金构件的性能尤为重要,因此本文通过模拟钎焊过程,重点研究钎焊后冷却工艺制度对铬锆铜合金组织性能的影响。试验结果表明,高温钎焊后材料的力学性能和显微硬度显著降低,随着钎焊后合金冷却速度的提高,其强度和硬度提高幅度也增加,特别是水冷处理后,其材料强度和硬度接近钎焊前。因此液体火箭发动机推力室钎焊组件的性能可以通过控制钎焊后冷却工艺制度,使钎焊时回溶的强化相得以均匀弥散析出,降低钎焊过程对结构性能的影响,保证钎焊组件的使用性能。

Because of the special condition that Cu-Cr-Zr alloy is used in the thrust chamber body of liquid rocket engine,it is very important to optimize the properties of diffusion brazing Cu-Cr-Zr alloy components.Therefore,this paper focuses on the effect of cooling process system after brazing on microstructure and properties of Cu-Cr-Zr alloy by simulated brazing process.The results show that the mechanical properties and microhardness of the alloy after brazing at high temperature decrease significantly,and the strength and hardness of the alloy increase with the increase of cooling rate after brazing,especially after water cooling,the strength and hardness of the material are close to that before brazing.Therefore,the performance of brazing components in the thrust chamber of liquid rocket engine can be controlled by the cooling process system after brazing,so that the dissolved strengthening phase during brazing can be dispersed evenly,and the influence of brazing process on the structural performance can be reduced,and the performance of brazing components can be guaranteed.