TC4合金电子束冷床熔炼过程中LDI和HDI的去除  

Elimination of LDI and HDI in TC4 Alloy During Electron Beam Cold Hearth Melting

作　　者：韩明臣[1] 张英明[1] 周义刚[2] 赵铁夫[1] 杨建朝[1] 李军[1] 周廉[1] 

机构地区：[1]西北有色金属研究院,陕西西安710016 [2]西北工业大学,陕西西安710072

出　　处：《稀有金属材料与工程》2008年第4期665-669,共5页Rare Metal Materials and Engineering

基　　金：国家“973”项目资助(2007CB613802)

摘　　要：通过添加人工夹杂,研究了TC4合金电子束冷床熔炼(EBCHM)过程中LDI和HDI夹杂的溶解和沉淀去除。结果表明,高温下TiN与基体钛之间存在扩散反应,从而使TiN在一定时间内可溶解于基体钛中,尺寸2.5mm的TiN粒子可在1800℃,5min时间内完全溶解消失。氮化的海绵钛粒子和WC粒子在冷床中有足够的时间溶解上浮/下沉,达到完全去除的目的。EBCHM去除LDI和HDI的精炼机制为溶解和密度差作用。The elimination of LDI and HDI through dissolution and sinkage in TC4 Alloy during electron beam cold hearth melting was studied by adding artificial inclusion particles. The results show that a diffusion reaction exists between TiN and TC4 matrix at high temperature, which leads to TiN＇s dissolving in the titanium matrix in a certain duration. TiN particles with a size of 2.5 mm may dissolve completely in five minutes at the temperature of 1800℃. The artificial titanium sponge particles can float to the melt surface and dissolve in TC4 melt and WC particles can sink to the interface of the melt/skull, which is captured by the skull. LDI and HDI are eliminated through the mechanism of dissolution and floating by means of density difference during EB melting.

关 键 词：LDI HDI TC4钛合金 电子束冷床熔炼 精炼 

分 类 号：TF823[冶金工程—有色金属冶金]