316L不锈钢基材防氚渗透Al_2O_3涂层残余热应力分析  

Residual stresses of Al_2O_3 tritium penetration barrier on 316 L stainless steel substrate

作　　者：刘红兵[1] 陶杰[1] 张平则[1] 常华[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京210016

出　　处：《核科学与工程》2007年第2期126-132,共7页Nuclear Science and Engineering

基　　金：国家自然科学基金(50571045)

摘　　要：在聚变堆防氚渗透第一壁制备过程中,Al_1O_3涂层与316 L不锈钢基体间由于材料热膨胀系数的差异容易产生裂纹。本文利用有限元方法研究了Al_2O_3／316 L涂层制备过程中的残余应力的分布。结果表明在界面等区域存在严重的应力集中;涂层厚度、孔隙率大小以及涂层是否致密对残余应力水平有很大影响。涂层内部关键区域的残余应力水平,随着涂层厚度增加而增加;孔隙率不同对界面的残余应力分布趋势没有明显影响,但对应力值却有很大影响,孔隙率增大涂层残余应力最大值下降;相同厚度情况下致密Al_2O_3涂层所受压应力远大于多孔Al_2O_3涂层承受的残余应力。During the preparation of the first barrier of nuclear fusion reactor, it was found that cracks were easily engendered at the interface between Al2O3 coatings and the substrate of 316L because of the mismatch of their thermal expansion coefficients. The distributions of residual stresses in Al2O3/316 L coatings were simulated by finite element analysis. The results show that a remarkable stress concentration at the edge of some interface. The thickness,the porosity and the dense of the coatings play an important role in the level of residual stresses. FEA molding results indicate that the levels of residual stresses at the critical interface regions increase with the increase of the thickness. The porosity has no effect on the distribution of the interfacial residual stress, but it affects the value of the stresses greatly; The levels the increase of the porosity. The calculated thermal were much larger than those in porous A1203 coatings coatings were the same. of residual stresses decrease with stresses in dense Al2O3 coatings when the thickness of both Al2O3 coatings were the same.

关 键 词：第一壁材料 残余应力 孔隙率 

分 类 号：TL341[核科学技术—核技术及应用]