Abstract The heterogeneous interactions between the pre-existing thermal residual stress and external compression in the WC-Co cemented carbide are investigated, where the microstructural characteristics are taken into account simultaneously. A new method for creating three-dimensional finite element model based on real microstructure of the cemented carbides was proposed. The deformation behavior of the as-sintered cemented carbide was quantified and demonstrated in detail. The results indicate that among the heterogeneous distribution of strain responses in the dual-phase microstructure during compressive loading, the layer-like metal binder distributing in the transverse cross-section with respect to the direction of compression has the earliest strain response. The microcracks may preferentially nucleate at these regions due to the largest accumulation of plastic deformation. It is suggested that the activation sequence of dislocation slip systems in the metal binder can be changed by the anisotropic distribution of stress.

中文翻译：

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烧结态硬质合金的异质应变响应

摘要 研究了WC-Co 硬质合金中预先存在的热残余应力和外部压缩之间的异质相互作用，同时考虑了微观结构特征。提出了一种基于硬质合金真实微观结构建立三维有限元模型的新方法。对烧结态硬质合金的变形行为进行量化和详细展示。结果表明，在压缩加载过程中双相微观结构中应变响应的不均匀分布中，相对于压缩方向分布在横截面中的层状金属粘合剂具有最早的应变响应。由于塑性变形的最大积累，微裂纹可能优先在这些区域成核。表明应力的各向异性分布可以改变金属结合剂中位错滑移系统的激活顺序。