基于非均匀微观组织的纯铁板抗拉性能

为研究纯铁板制作过程中由微观组织的非均匀性对其力学性能产生的影响,以DT4C、DT4E板材为研究对象,探究纯铁板在不同厚度、拉伸速率及取样方向下应力应变曲线的变化规律,探索其对纯铁板拉伸性能的影响,得出纯铁板宏观物理特性的非均匀性变化规律。结果表明:取样方向对拉伸性能影响较小;板材厚度为0.5～2 mm时,屈服强度与厚度呈正比关系,纯铁板拉伸性能在厚度方向上具有尺寸效应;相同拉伸速率下,延伸率随厚度的增大先增大后减小,呈抛物状分布,存在一个最优厚度2 mm使得纯铁板的力学性能充分发挥;铁板内部构造的非均匀性决定了同种材料不同取样位置的试件力学性能的差异性。

Research on tensile performance of pure iron plate based on non-uniform microstructure

In order to study the influence of the inhomogeneity of the microstructure on the mechanical properties of the pure iron plate during the production process, the DT4C and DT4E plates are used as the research object to explore the stress-strain curve of the pure iron plate under different thicknesses, tensile rates and sampling directions Exploring its influence on the tensile properties of pure iron plates, the law of non-uniformity of the macroscopic physical properties of pure iron plates is obtained. The results show that the sampling direction has little effect on the tensile properties; when the thickness of the sheet is 0.5mm-2mm, the yield strength is proportional to the thickness, and the tensile properties of the pure iron plate have a size effect in the thickness direction; at the same tensile rate, The elongation first increases and then decreases with the increase of thickness, showing a parabolic distribution. There is an optimal thickness of 2mm so that the mechanical properties of the pure iron plate can be fully utilized; the non-uniformity of the internal structure of the iron plate determines the different sampling of the same material The difference of the mechanical properties of the test piece at the location.