设计一种非金属材料高温应力?应变曲线测试方法,并对所获得的MnS高温应力?应变曲线数据进行摩擦修正.在此基础上利用有限元分析技术,研究变形参数对MnS夹杂物演变的影响,并设计相应物理实验进行对比分析.结果表明:实验方法获得MnS高温变形数据有较高的可靠性.在基体变形过程中,MnS夹杂物形状由球状逐渐变为椭球体形、直至圆薄片状,且基体不同位置处夹杂物变形后的形貌不同.随着MnS夹杂物初始尺寸的增加,探伤检测不通过风险增大,锻件质量亦随之变差.%A novel method for testing stress–strain curves of non-metallic materials was presented. The high temperature stress–strain curves of MnS were preliminarily obtained and corrected to account for the influence of friction. Using the finite element method, the influence of deformation parameters on the deformation evolution of MnS inclusions was investigated based on the experimental reference data. The corresponding physical experiment was designed for comparative analysis. The results indicate that the experimental high-temperature deformation data of MnS are highly reliable. In the process of matrix deformation, the shapes of MnS inclusions change from spherical to ellipsoidal and even to lamellar. There are some differences in the morphological deformation of MnS inclusions located at different positions. With the increase in the initial size of MnS inclusions, the risk of failing the inclusion-flaw inspection increases and the forging quality further deteriorates.
展开▼
