【摘要】 硬质合金中存在分布不均匀的残余热应力，在承载过程中残余热应力与外加载荷产生复杂的交互作用，影响材料的力学性能。现有的实验和模拟方法均为统计性分析方法，难以在微观组织尺度分析应力分布的细节和特征。本工作利用有限元模拟的方法研究了硬质合金的残余热应力分布特征，分析了不同载荷方式下硬质合金内的应力状态，研究了残余热应力和外加载荷之间的相互作用。基于应力分析，提出了提高硬质合金承载能力的组织结构设计方法和理论依据。该方法也可应用于其他多种多相复合材料的应力分析和微观组织优化。更多还原

【Abstract】 The residual thermal stress(RTS) is distributed heterogeneously and has complex interactions with the applied loadings, which significantly influences the mechanical properties of cemented carbides. The traditional experimental and simulation methods can only analyze the stress distribution statistically, and they cannot be applied in the study on the microstructure scale to get the detailed stress distribution. Using the finite element method, this study investigated the RTS in cemented carbides and the stress distribution under different loading conditions. Based on the stress analysis, it proposed a method to strengthen cemented carbides by tailoring their microstructures. The new approach presented in this study can be applied to stress analysis and microstructure tailoring for a broad range of multiphase composites.更多还原