With the rapid development of high-power lasers, efficiency of laser cutting and thickness of cutting material have been greatly increased. In this study, a 10 kW fiber laser was used to cut 18 mm thick 316L stainless steel sheets. The surfaces and cross sections of samples were observed by an optical microscope and a scanning electron microscope. It was found that the quality of laser cutting was closely related to its process parameters, and the most important defects during the laser cutting process included striation and dross. On this basis, effects of process parameters such as defocusing amount and cutting speed on the kerf morphology and microstructure of the recast layer were investigated. The cutting surface was clearly divided into four characteristic areas in the vertical direction; the surface morphology and the recast layer microstructure of each area were analyzed. The results of the nanoindentation test showed that microhardness of the recast layer increased significantly comparing with th...

中文翻译：

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大功率激光切割中厚不锈钢板表面形貌及重铸层显微组织研究

随着大功率激光器的快速发展，激光切割的效率和切割材料的厚度都得到了极大的提高。在本研究中，使用 10 kW 光纤激光器切割 18 mm 厚的 316L 不锈钢板。通过光学显微镜和扫描电子显微镜观察样品的表面和横截面。研究发现，激光切割的质量与其工艺参数密切相关，激光切割过程中最重要的缺陷包括条纹和熔渣。在此基础上，研究了离焦量、切削速度等工艺参数对重铸层切缝形貌和显微组织的影响。切割面在垂直方向上清晰地划分为四个特征区域；分析了各区域的表面形貌和重铸层微观结构。纳米压痕试验结果表明，重铸层的显微硬度较之...