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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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)
关键词
LDI
HDI
TC4钛合金
电子束冷床熔炼
精炼
low density inclusion
high density inclusion
titanium alloy TC4
electron beam cold hearth melting
refining
