摘要
采用光学显微镜、扫描电镜(SEM)和电子探针(EPMA)技术,研究了Mn含量对铸造K325高温合金凝固组织和元素偏析的影响。研究结果表明,Mn元素添加对合金晶粒度和二次枝晶间距无明显影响,却明显促进Nb、Mo元素偏聚于枝晶间,增大合金的偏析倾向。Mn元素的添加,使得Mn元素由正偏析元素变为负偏析元素,但Mn元素对合金铸态组织中第二相析出行为并无明显影响。
The effect of Mn contents on solidification microstructure and segregation of cast K325 alloy were investigated in this paper. The results showed that, Mn element has no significant effect on grain size, secondary dendrite spacing and the second phase precipitation behavior of the alloy. But Mn promotes significantly the segregation of Nb and Mo, atinterdendritic area, and increased segregation tendency of the alloy. The segregation tendency of Mn is from the positive segregation elements into negative segregation elements with the increase of Mn content.
出处
《沈阳理工大学学报》
CAS
2017年第1期1-4,共4页
Journal of Shenyang Ligong University
基金
国家自然科学基金资助项目(51301171)
关键词
铸造K325合金
MN
枝晶偏析
凝固组织
cast K325 alloy
Mn
element segregation
solidification microstruture
