等温变形对惯性摩擦焊IMI834/Ti6246双钛合金组织与性能的影响研究

The effect of isothermal deforming on the microstructure and property of inertial friction welding IMI834/Ti6246 dual titanium alloy

摘要:

采用惯性摩擦焊与等温变形相结合的复合技术制备出IMI834/Ti6246双钛合金缩比盘,分析了等温变形对惯性摩擦焊双钛合金缩比盘组织与性能的影响。结果表明：IMI834/Ti6246双钛合金经惯性摩擦焊后焊缝组织细小,但两侧热影响区内组织粗大,超声波无损检测发现焊后双合金缩比盘内局部存在有缺陷。而IMI834/Ti6246双钛合金经等温变形后,焊后缺陷得到有效消除,焊缝两侧热影响区组织发生了明显改变,中心焊缝和两侧热影响区过渡更加均匀。惯性摩擦焊IMI834/Ti6246双钛合金缩比盘等温变形后焊缝得到有效强化,惯性摩擦焊+等温变形工艺可用于制备高性能双钛合金盘件。

Abstract:

The combined technology of inertial friction welding and isothermal deforming was utilized to prepare IMI834/Ti6246 dual titanium alloy scaled disk. The effect of isothermal deforming on the microstructure and property of inertial friction welding IMI834/Ti6246 dual titanium alloy scaled disk was analyzed. The results show that the inertial friction welding forms the fine microstructure in the welding seam of IMI834/Ti6246 dual titanium alloy, meanwhile results the coarse microstructure of heat affect zone on both sides. The ultrasonic nondestructive testing indicateds that there are some defects in local zone of welded dual titanium alloy scaled disk. After isothermal deforming, the residual inertial defects after inertial friction welding are effectively eliminated and the coarse microstructure of heat affected zone both sides is obviously improved which homogenizes the transition zone between welding seam and both sides. The weld steam of inertial firction welded IMI834/Ti6246 dual alloy scaled disk was effectively strengthened during isothermal deforming. The inertial friction welding and isothermal deforming could be combined to prepare high performance dual titanium alloy disk.