基于铬青铜超塑变形的铬青铜/钨合金固相焊接

摘要

The feasibility of solid-phase we1ding between chromium bronze and wolfram alloy was explored under the condition of superplastic deformation of chromium bronze.The results show when the sample surfaces of chromium bronze and wolfram alloy to be welded were carefully cleaned,pre-pressed under 10～30MPa.at the welding temperature of 740～800℃ and at initial strain rate of(1.67～13.3)×10-4s-1,the shear strength of butt joint is up to or close to that of chromium bronze base metal in 3～10minutes pressure welding,so that the solid-phase welding can be finished.The chromiumbronze takes place superplastic deformation in welding process,but the deformation of wolfram alloy is little.The atoms of two sides at initial interface appears obvious diffusion.%探讨了在铬青铜超塑变形条件下实现铬青铜与钨合金固相焊接的可行性及影响因素,试验表明,将铬青铜与钨合金试样待焊表面认真清洗后对接，并施加10～rn30MPa的预应力，然后在740～800℃、初始应变速率(1.67～13.3)×10-4s-1变形条件下恒温压接3～10min即可实现接头剪切强度达铜基母材强度的固相焊接。焊接过程中铬青铜发生了超塑性流变，钨合金变形甚微，原界面两侧原子发生了明显扩散。