摘要
研究了不同的含Ti量对4C-20Cr(质量分数,%)过共晶高铬铸铁显微组织的影响。结果表明,随着含Ti量的增加,初生碳化物和总的碳化物(初生碳化物和共晶碳化物)均逐渐细化;TiC的体积分数也随含Ti量的增加而增加,但TiC出现长大和团聚现象。Ti细化过共晶高铬铸铁的机理为:弥散分布的TiC可能作为初生碳化物的异质形核质点;TiC颗粒阻碍初生碳化物的长大;生成TiC的反应消耗一部分C而降低过共晶高铬铸铁的过共晶程度。
The effect of Ti on the microstructure of the 4wt%C-20wt%Cr hypereutectic high-chromium cast iron was studied in this paper. The results show that the primary carbides and the total carbides （primary carbides and eutectic carbides） all were refined gradually with the increase of Ti, and the volume fraction of TiC also increased with the increase of Ti, while the TiC particles grew and were agglomerated. The refining mechanism of Ti may be： the dispersive TiC particles in the melt may act as the heterogeneous matrix of the primary carbides, which may also impede the growth of the primary carbides; the alloy＇s hypereutectic degree was decreased due to the formation of TiC, which is beneficial for the refinement of the alloy.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第1期101-104,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金资助(50571078)
关键词
过共晶
钛
细化
高铬铸铁
hypereutectic
titanium
refining
high-chromium cast iron
