超声振动对TC4钛合金窄间隙激光焊接组织及强化机理的影响

王建峰, 许珍木, 刘战, 高转妮, 占小红

Effect of Ultrasonic Vibration on the Microstructure and Strengthening Mechanism of Narrow Gap Laser Welding of TC4 Titanium Alloy

WANG Jianfeng, XU Zhenmu, LIU Zhan, GAO Zhuanni, ZHAN Xiaohong

图7 有/无超声作用下TC4钛合金窄间隙激光焊接接头层间柱状晶组织生长特征和不同位置层间柱状晶面积及长/短轴之比

Fig.7 Growth characteristics of interlayer columnar crystal in TC4 titanium alloy for narrow gap laser welding without (a-e) and with (f-j) ultrasound; and comparisons of columnar grain area (k) and long/ short axis ratio (l) of welded joints at various positions (White arrows in Figs.7a, c, f, and h show the growth orientations of β columnar crystal) (a, f) interlayer columnar morphologies (b, g) size statistics (c, h) competitive growth of interlayer columnar crystals (d, i) microstructures of the inner filled layer of columnar crystal (e, j) morphologies near the inner fusion line of columnar crystal