摘要
采用电磁感应定向凝固生长炉制备了铬锰氮不锈钢定向凝固试样,研究了凝固速率和稀土铈含量对试样稳态区凝固组织的影响。结果表明,当凝固速率为12μm/s时,试样稳态区的凝固组织是胞状组织,随着凝固速率增加到120μm/s和500μm/s时,试样稳态区的胞状组织向枝晶状组织转变,且随冷速的增加,枝晶臂来不及长大。当冷速为12μm/s时,随铈含量增加到0.067%时,枝晶尖端的成分过冷增加,凝固组织也由胞状向枝晶状转变,晶粒形态发生变化,晶粒界面增多,从而提高了铬锰氮不锈钢的硬度。
In order to study the effect of cerium and directional solidification cooling rate on the steady state region mircostructure of Cr-Mn-N stainless steel, the electromagnetic induction directional solidification growth furnace was used in the research to prepare the samples. The results show that when the cooling rate was 12 μm/s, steady state region of the sample was cellular crystals structure. The steady state region of the sample was tumed into columnar crystals structure and dendritic arm spacings had no time to, grow up, as the solidification rate increased to 120μm/s and 500 μm/s. When the cooling rate was 12 μm/s, constituent supercooling of dendritic tip was promoted with the content of rare earth cerium increased to 0.067%, solidification microstructure was turned into columnar crystals structure by cellular crystal. The grains shape changed and the grains interface increased, so hardness of the Cr-Mn-N stainless steel can be improved.
出处
《铸造》
CAS
CSCD
北大核心
2017年第4期411-413,417,共4页
Foundry
基金
内蒙古自治区自然科学基金项目(2014MS0519)
关键词
铬锰氮不锈钢
稳态区
稀土铈
冷却速率
Cr-Mn-N stainless steel
steady state region
rare earth Ce
cooling rate
