316L不锈钢基材功能梯度Al涂层残余热应力分析  

Stimulation of residual stresses in functionally gradient Al coatings on 316L 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,南京210016

出　　处：《核技术》2008年第2期105-110,共6页Nuclear Techniques

基　　金：国家自然科学基金(50571045);江苏省科技成果转化专项资金(BA2006067)

摘　　要：涂层材料的功能性和可靠性在很大程度上受残余热应力的影响,为降低残余热应力防止涂层开裂以及提高其热机械性能,利用有限元方法对Al/316L系梯度功能材料在制备过程中产生的残余热应力分布进行分析,详细讨论了成分分布指数、涂层厚度和梯度层数目对应力大小和分布的影响。分析结果表明成分分布指数的增大不但影响涂层和基体界面的应力大小,还影响涂层中热应力峰值所处位置;涂层残余应力随着梯度层厚度的增加而减小;梯度层数的增多,有利于涂层中残余热应力的缓和,但当梯度层数达到9时,缓和效果并不明显。The functionality and reliability of coated devices are strongly affected by residual stresses of coatings. The distributions of the residual stresses in Al/316L functionally gradient coatings after the fabrication were simulated by means of finite element analysis in order to prevent spallation and to improve the thermo-mechanical behaviour of the tritium penetration barrier. The effect of compositional exponent, the coatings thickness and the number of graded layers on the residual stresses were discussed. The results showed that the compositional gradient of the coating had an obvious influence not only on the residual stress magnitude at the interface between the coating and the substrate, but also on the location of the stress peak. The residual stresses on the coating surface and at the coating/substrate interface decreased with an increased coatings thickness, and decreased with the increasing in the number of graded layers until it reach 9.

关 键 词：功能梯度材料 有限元分析 残余热应力 涂层 

分 类 号：O343.6[理学—固体力学]