Effect of Relatively Low Levels of Porosity on the Plasticity of Metals and Implications for Profilometry-Based Indentation Plastometry
Effect of Relatively Low Levels of Porosity on the Plasticity of Metals and Implications for Profilometry-Based Indentation Plastometry
复制标题
相对较低的孔隙率对金属塑性的影响以及基于轮廓测量的压痕塑性测量的意义
DOI：
10.1002/adem.202200642
复制
发表时间：
2022
影响因子：
3.6
通讯作者：
Reiff-Musgrove R
中科院分区：
文献类型：
--
作者：
Reiff-Musgrove R
在这里，分散（相对较低的水平）的孔隙度在金属的塑性变形的影响进行了检查。工作中使用了通过增材制造制成的不锈钢样品。研究发现，孔隙率降低屈服和加工硬化过程中的应力水平，与孔隙含量大致成比例。在拉伸和压缩过程中，该效应的强度之间没有显著差异，尽管多孔性确实降低了拉伸延展性。最后，使用基于轮廓术的压痕塑性测量（PIP）方法（用于从压痕测试获得应力-应变曲线）。孔隙倾向于使推断的屈服应力比拉伸试验期间更强烈地下降，并给出更高的加工硬化初始速率。这与压头附近的高局部应变有关，导致孔隙闭合，因此在测试期间体积不守恒。凹痕周围堆积的减少会导致推断的应力-应变曲线出现错误。
Herein, the effect of dispersed (relatively low levels of) porosity within a metal on its plastic deformation is examined. Stainless steel samples, made via additive manufacturing, are used in the work. It's found that porosity reduces stress levels during yielding and work hardening, approximately in proportion to the pore content. There is no significant difference between the strength of the effect during tension and compression, although porosity does reduce the tensile ductility. Finally, the profilometry‐based indentation plastometry (PIP) methodology (for obtaining stress–strain curves from indentation testing) are used. Porosity tends to bring the inferred yield stress down more strongly than during tensile testing and give higher initial rates of work hardening. This is associated with high local strains near the indenter causing closure of pores, so that volume is not conserved during the test. The resultant reduction in the pile‐up around the indent creates errors in the inferred stress–strain curve.