CfSiC复合材料磨削表面的残余应力分析-中国有色金属学报.PDFVIP

19 10 2009 10 Vol.19 No.10 The Chinese Journal of Nonferrous Metals Oct. 2009 1004-0609(2009)10-1809-06 C /SiC f ( 410073) X C/SiC SiC(422) C/SiC TB 323 A Analysis of residual stresses on ground surface of C /SiC composites f YU Kun, ZHANG Chang-rui, CAO Ying-bin, LIU Rong-jun (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 C /SiC composites were studied by X-ray diffractometry. Together with f 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 20 SiC [4−5] Be /