In this paper, the effect of laser overlap on the low-carbon and stainless steel are investigated. The analyzed samples are made of AISI 4130 low-Carbon steel and AISI 410 stainless steel with 50% overlap. The used laser is an industrial high-power diode laser with a continuous wave and a maximum power of 2 kW. Samples are fabricated using optimized levels for laser power, focal plane position, and laser scanning speed, and the heat-treatment process is done after that. The parameters and conditions for the laser hardening process of both samples are the same situation. Then, the microstructure analysis is done using OM and SEM. Besides, the hardness of the samples is tested in the hardening depth and width. The study shows that the hardness is improved for both samples at the overlap area, up to 762 hv for AISI 4130 and 675 hv for AISI 410. Also, in both samples the amount of ferrite phase has decreased.

本文研究了激光重叠对低碳钢和不锈钢的影响。分析的样品由 AISI 4130 低碳钢和 AISI 410 不锈钢制成，重叠 50%。所用激光器为工业用大功率二极管激光器，连续波，最大功率2kW。使用优化的激光功率、焦平面位置和激光扫描速度制造样品，然后进行热处理过程。两个样品的激光硬化工艺参数和条件是相同的情况。然后，使用 OM 和 SEM 进行微观结构分析。此外，在硬化深度和宽度上测试样品的硬度。研究表明，两个样品在重叠区域的硬度都有所提高，AISI 4130 的硬度高达 762 hv，AISI 410 的硬度高达 675 hv。此外，