(1. 中南大學 粉末冶金國家重點實驗室，長沙 410083；
2. 中南大學 數(shù)學科學與計算技術學院，長沙 410083；
3. 湘潭大學 機械工程學院，湘潭 411105)
摘 要: 采用有限元方法分析氮鋁鈦涂層的殘余熱應力，研究不同的基體及過渡層對殘余熱應力分布的影響。結果表明：當基體為硬質(zhì)合金時，涂層內(nèi)以拉應力為主，而基體為不銹鋼時，涂層內(nèi)以壓應力為主；增加過渡層可以使涂層內(nèi)的殘余應力減少40%以上；硬質(zhì)合金基體中涂層的拉應力隨基體鈷含量和涂層厚度的增加而減少；無過渡層時，不銹鋼基體存在明顯的塑性約束區(qū)，有過渡層時，隨著界面應力的減少，塑性約束區(qū)明顯減小或消失。因此，通過不同的涂層和基體搭配可以改善應力場，同時增加過渡層可以緩和界面應力和增強界面結合力。
關鍵字: TiAlN涂層；有限元方法；殘余應力；過渡層
XIAO Yi-feng1, HUANG Bai-yun1
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. School of Mathematical Science and Computing Technology,
Central South University, Changsha 410083, China;
3. College of Mechanical Engineering, Xiangtan University,Xiangtan 411105, China）
Abstract: Thermal residual stresses in TiAlN coatings were calculated using the finite element method. Effects of different substrates and interlayer bonding on residual stress field were investigated. The results show that the high tensile stress occurs in TiAlN coating as the substrate is cemented carbide and the high compressive stress occurs as the substrate is stainless steel. The composites show a decrease of 40% in interface shear stress when the composites has a interlayer. The tensile stress in coating layer decreases with increasing coating thickness and cobalt content of cemented carbide substrate. Without interlayer, plastic constraint zone develops distinctly in stainless steel substrate, but the plastic constraint zone decreases greatly even disappears when there is a transition layer. Residual stress distribution can be improved by varying the coating thickness or selecting different substrates.
Key words: TiAlN coating; finite element method; thermal residual stresses; interlayer
