(国防科学技术大学 航天与材料工程学院 先进纤维及其复合材料重点实验室，长沙 410073)
摘 要: 应用X射线衍射法对C/SiC复合材料的磨削残余应力进行研究。结合抛光和热处理工艺，应用主应力之和的变化量确定磨削残余应力的分布。结果表明：SiC(422)晶面族比其它相和晶面更适用于复合材料残余应力的研究；热塑性引入的残余拉应力作用于数微米的较浅表层深度内，但对磨削表面的残余应力起决定作用；冷塑性残余应力对应的作用深度较大；热塑性和冷塑性残余应力均可通过热处理方式得以消除。
关键字: C/SiC复合材料；磨削残余应力；热处理
（Key Laboratory of Advanced Fibers & Composites, College of Aerospace & Materials Engineering,
National University of Defense Technology, Changsha 410073, China）
Abstract:Ground-introduced residual stresses of Cf/SiC composites were studied by X-ray diffractometry. Together with polishing and thermal treatment, the increment of the sum of principal residual stresses was used to determine the residual stresses distribution of ground Cf/SiC composites. The results show that SiC(422) plane is more suitable for residual stresses analysis than other phases and planes. The depth of hot plastic residual stresses is only several micrometers. The ground residual stresses are determined by hot plastic residual stresses. The cold plastic residual stresses correspond to greater depth. The hot plastic residual stresses and cold plastic residual stresses can be eliminated by thermal treatment process.
Key words: Cf/SiC composites; ground-introduced residual stress; thermal treatment
