Ti处理FeCrAl不锈钢的凝固组织和夹杂物  

Solidification Structure and Inclusions of Ti-containing FeCrAl Stainless Steel

作　　者：韩志彪 刘建华[1] 何杨[1] 

机构地区：[1]北京科技大学冶金工程研究院,北京100083

出　　处：《钢铁钒钛》2016年第2期125-132,共8页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金(51374023)资助项目

摘　　要：采用Thermo-calc软件对不同Ti含量的FeCrAl不锈钢铸锭Scheil凝固过程中TiN和AlN在凝固前沿液相的析出规律进行计算,结果表明铸锭中Ti含量应控制在0.08%附近。铸锭的凝固组织分析表明中心等轴晶率随着Ti含量的提高先升高后降低,Ti含量为0.088%时纵截面和横截面中心等轴晶率均达到最大值,分别为39.5%和16%。高温拉伸试验结果表明,Ti的加入对铸锭的高温力学性能没有明显改善作用。扫描电镜分析表明铸锭中主要有纯TiN、TiN-AlN复合夹杂、TiN-Al_2O_3复合夹杂、纯TiS夹杂以及TiS-氧化物复合夹杂这五种含Ti夹杂物,前三种夹杂物占据主要地位,后两种夹杂物则非常少。The precipitation of TiN and AlN in FeCrAl stainless steel were calculated using Thermo-Calc software. The results indicated that the Ti content should be controlled around 0. 08%. The ratios of central equiaxed grain in longitudinal and cross section firstly rise then decreased with Ti content. When Ti content was 0. 088%,these two ratios reached maximum of 39. 5% and 16%,respectively. Results of high temperature tensile indicated that the addition of Ti did not improve the high-temperature mechanical properties. SEM analysis indicated that there were mainly five kinds of Ti-containing inclusions,which were pure TiN,TiN（ AlN） compound inclusion,TiN-Al_2O_3 compound inclusion,pure TiS and TiS（ oxidation） compound inclusion. The former three types of inclusions were dominant while the latter two were very low in terms of their quantities.

关 键 词：铁铬铝不锈钢 铸锭钛处理 Schei凝固 柱状晶 等轴晶 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG244.3[金属学及工艺—金属材料]