超声振动对电火花表面强化的作用

Experimental investigation of ultra-assisted electrode sparkles depositing process

超声辅助电火花表面强化技术是电火花表面强化技术基础上发展起来的,将超声引入电火花表面强化可以得到质量更高的表面强化层.通过在45钢基体上添加超声振动,实现电火花表面强化过程,并据此研究超声对电火花表面强化技术的促进作用.结果表明,超声振动能够扩大电火花表面强化技术的强化层成形工艺区间,获得表面形貌更加均匀的强化层.同时超声振动将电火花表面强化技术的最大沉积效率提高了30%,晶粒尺寸减小了24.18%,显微硬度提高了10%.超声振动扩大了热影响区的范围,并将热影响区的硬度提高至基体以上.超声辅助电火花表面强化获得的结合面有更好的耐腐蚀性能.

Ultra-assisted electrode sparkle depositing(UAESD) developed based on the traditional electrode sparkle depositing(ESD),and better coating could be achieved when ultrasonic vibration was adopted in the ESD technology.In this paper,UAESD was realized by the supersonic vibration of the body.The results showed that formation technological parameters were enlarged by supersonic vibration,and the better surface topography was achieved.The deposition efficiency increased 30%,microhardness increased 10% while the grain size decreased 24.18% under the influence of the supersonic vibration.With the UAESD process,heat affected zone was enlarged and the microhardness at those points was increased.Moreover,the corrosion resistance of the bond was enhanced.