凝固速度对奥氏体不锈钢定向凝固组织及其固液界面稳定性的影响  

Influence of solidification rate on solid-liquid interface in unidirectional solidification microstructure of austenitic stainless steel

作　　者：刘旭峰[1,2] 李秋书[2,3] 杜卫东[2] 李仁兴[2] 翟启杰[2] 

机构地区：[1]宝钢股份研究院,上海201900 [2]上海大学材料科学与工程学院,上海200072 [3]太原科技大学,太原030024

出　　处：《材料科学与工艺》2009年第1期110-112,117,共4页Materials Science and Technology

基　　金：上海市科委科研计划项目课题资助

摘　　要：本文研究了凝固速率对1Cr18Ni9Ti不锈钢定向凝固组织及其固液界面稳定性转变规律的影响.结果表明,在某特一定的温度梯度下,随着凝固速度的增加,定向凝固的固液界面由平面转变为胞状晶,再转变为树枝晶.研究发现,随着凝固速率的增大,定向凝固组织枝晶形貌逐渐细化,枝晶间距减小.Under the conditions of certain temperature gradient and different solidification rate, the unidirectional solidification experiment of austenitic stainless steel 1Cr15Ni9Ti was carried out. The microstructure of 1Cr18Ni9Ti steel was also analyzed in different solidification rate. The result shows that the solidification microstrueture develops from plane to cellular morphology to dendrite with increasing solidification rate. Then the dendrite refines gradually and the distance between dendrites decreases greatly.

关 键 词：1CR18NI9TI钢 定向凝固 凝固速度 固液界面 连铸 

分 类 号：V524.3[航空宇航科学与技术—人机与环境工程]