Seo Youngjin, Lee Dongkyoung, Pyo Sukhoon
Department of Mechanical and Automotive Engineering, Kongju National University, Cheonan 31080, Korea.
School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea.
Materials (Basel). 2020 Jan 23;13(3):546. doi: 10.3390/ma13030546.
Cement-based materials are the most prevalent construction materials, and the conventional cutting techniques are still mostly used for fabricating the materials. However, these conventional cutting methods could generate undesirable micro-cracks and remove unintentional structural sections. This experimental study aims to evaluate the effects of the new fabricating method using laser on the microstructural characteristics of the cement-based materials. The experimental variables are laser cutting speed, water to cement ratio and material compositions. In order to compare the microstructure before and after the laser interaction, the microstructure of the cut surface is observed through scanning electron microscopy/energy dispersive X-Ray (SEM/EDX). After the laser interaction, the Material Removed Zone (MRZ) and Heat Affected Zone (HAZ) are observed on the cut surface. In MRZ, it is found that the glassy layer is thickened by an increasing amount of silicate-based materials in cement-based materials. In addition, it concluded that the amount of silicate-based material mixed in the cement-based materials affects the laser cutting quality.
水泥基材料是最普遍的建筑材料，目前仍大多采用传统切割技术来制造这些材料。然而，这些传统切割方法会产生不良微裂纹，并去除意外的结构部分。本实验研究旨在评估使用激光的新制造方法对水泥基材料微观结构特征的影响。实验变量为激光切割速度、水灰比和材料成分。为了比较激光作用前后的微观结构，通过扫描电子显微镜/能量色散X射线（SEM/EDX）观察切割表面的微观结构。激光作用后，在切割表面观察到材料去除区（MRZ）和热影响区（HAZ）。在材料去除区，发现水泥基材料中硅酸盐基材料含量增加会使玻璃层增厚。此外，得出结论，水泥基材料中混合的硅酸盐基材料的量会影响激光切割质量。
