摘要
结合Cr9Mn14Ni0.5合金凝固模式的特点,研究了在糊状区保温对其氮含量的影响。结果表明,糊状区保温可以有效地提高合金的氮含量。在0.6 MPa的氮气氛下进行糊状区保温20min,氮的质量分数可达0.43%。尽管糊状区保温会导致奥氏体晶粒的粗化,但是由于氮含量的增加,压缩性能会得到提高。糊状区保温可以在避开凝固过程中铁素体区的同时,促进液相中的氮向奥氏体扩散,这是糊状区保温能够提高氮含量的原因。
The effect of holding Cr9Mn14Ni0.5 alloy melt in mushy zone on its nitrogen content was investigated. It is found that holding the melt in mushy zone can effectively increase the nitrogen solubility of the alloy, and a sig- nificant grain coarsening occurs during holding the alloy in mushy zone. Because of the increase of nitrogen content, the compression property of the alloy would be improved. A maximum mass fraction of nitrogen of 0.43 was achieved by holding the melt in mushy zone for 20 min. Holding the melt in mushy zone can avoid the formation of ferrite and facilitate the diffusion of nitrogen from liquid phase into austenite, which is considered to be the reason for the increase of nitrogen content.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2015年第7期52-55,共4页
Journal of Iron and Steel Research
基金
国家自然科学基金资助项目(51464026)
关键词
奥氏体不锈钢
糊状区
氮含量
凝固模式
austenitic stainless steel
mushy zone
nitrogen content
solidification mode
