Xiu Shichao, Deng Yansheng, Kong Xiangna
Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China.
Materials (Basel). 2019 Jul 22;12(14):2327. doi: 10.3390/ma12142327.
In the grinding process, the materials within the surface layer may undergo phase transformation and finally form a strengthened layer. It is of great significance to model the phase transformation and predict the characteristics of the strengthened layer accurately. The phase transformations occur under the varying temperature and high stress-strain in grinding, so the effects of stress on the transformations are inescapable. This paper focuses on revealing the effects of stress on phase transformations in grinding. For this purpose, a thermal-mechanical-metallurgical direct coupling finite element (FE) model of grinding was established in Abaqus. The coupling interactions such as the latent heat, the volume change strain caused by phase transformation, and the stress-induced phase transformation were considered in the modeling procedure. Grinding experiments were carried out and proved the model could accurately predict the microstructure distribution and thickness of the strengthened layer. Further, the evolution of the phase transformation was discussed, and the effects of stress on the transformations were revealed.
在磨削过程中，表层内的材料可能会发生相变，最终形成强化层。对相变进行建模并准确预测强化层的特性具有重要意义。磨削过程中的相变是在温度变化和高应力应变条件下发生的，因此应力对相变的影响不可避免。本文重点揭示应力对磨削过程中相变的影响。为此，在Abaqus中建立了磨削的热-机械-冶金直接耦合有限元（FE）模型。建模过程中考虑了诸如潜热、相变引起的体积变化应变以及应力诱导相变等耦合相互作用。进行了磨削实验，证明该模型能够准确预测强化层的微观结构分布和厚度。此外，还讨论了相变的演变，并揭示了应力对相变的影响。
