(國防科學(xué)技術(shù)大學(xué) 航天與材料工程學(xué)院 先進纖維及其復(fù)合材料重點實驗室，長沙 410073)
摘 要: 應(yīng)用X射線衍射法對C/SiC復(fù)合材料的磨削殘余應(yīng)力進行研究。結(jié)合拋光和熱處理工藝，應(yīng)用主應(yīng)力之和的變化量確定磨削殘余應(yīng)力的分布。結(jié)果表明：SiC(422)晶面族比其它相和晶面更適用于復(fù)合材料殘余應(yīng)力的研究；熱塑性引入的殘余拉應(yīng)力作用于數(shù)微米的較淺表層深度內(nèi)，但對磨削表面的殘余應(yīng)力起決定作用；冷塑性殘余應(yīng)力對應(yīng)的作用深度較大；熱塑性和冷塑性殘余應(yīng)力均可通過熱處理方式得以消除。
關(guān)鍵字: C/SiC復(fù)合材料；磨削殘余應(yīng)力；熱處理
（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
