摘要
针对钛合金焊缝金属易形成粗大柱状晶严重影响其性能的特点,利用电子束扫描焊接,对Ti-6Al-4V合金焊缝金属凝固组织及微观组织进行了研究.结果表明,当电子束扫描频率为0～200Hz时,焊缝凝固组织均为300μm以上粗大柱状晶;当电子束扫描频率为300～1 000Hz时,焊缝凝固组织细化为100～300 pm等轴晶.其中扫描频率为400Hz时,焊缝金属凝固组织得到最佳细化效果,晶粒尺寸为100μm,同时焊缝金属微观组织均匀细小.并分析了有关细化机理.
In view of coarse columnar B grains in welded Ti alloy,the effect of scanning electron beam on solidified structure and microstruc-ture of welded Ti-6AL-4V ally was studied.It was indicated that fine e-quiaxed 13 grains had been gained by certain scanning electron beam.For example,when scanning frequency is 400 Hz,the β grains were about100 Ixm.And metastable β phase are fine and uniform.The related re-finement mechanism was discussed.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2005年第1期78-80,共3页
Transactions of The China Welding Institution
关键词
电子束扫描
钛合金
焊缝金属组织
scanning electron beam
Ti-6Al-4V alloy
solidified structure of weld metal
