The use of laser-assisted turning (LAT) can improve different aspects of the machinability of high hardness/strength materials. The heat applied in this process reduces the strength of the material and upon a proper selection of laser heat source and machining process parameters, a significant improvement in the machining process can be achieved. This research studies the effect of machining and laser heat source parameters on the surface integrity of the LAT process of AISI 4340 hardened steel with a hardness of 560 HV using Response Surface Methodology (RSM). The effect of machining process parameters (feed rate, depth of cut and cutting speed) and laser power on the surface integrity characteristics of the machined surfaces (white layer thickness, microhardness, surface roughness, and surface chemical composition) are investigated. A detailed finite element simulation of the process has been performed to better understand the physics of the process and to interpret the experimental results. Laser power and feed rate are shown to be the most significant parameters affecting the surface integrity of the machined surfaces. It has been shown that a proper selection of machining and laser heat source parameters makes it possible to minimize the adverse effect of laser heating in the LAT process. This can pave the way for the widespread application of the LAT process by eliminating one of the most important obstacles of this process by controlling the laser heat diffusion into the workpiece.

激光辅助车削（LAT）的使用可以改善高硬度/强度材料的可加工性的不同方面。热施加在该过程降低了材料的强度，并且在激光热源及加工工艺参数的适当选择，在加工过程中改进显著可以实现。这项研究使用响应表面方法（RSM）研究了加工和激光热源参数对AISI 4340硬度为560 HV的AISI 4340硬化钢的LAT工艺表面完整性的影响。研究了加工工艺参数（进给速度，切削深度和切削速度）和激光功率对加工表面的表面完整性特征（白层厚度，显微硬度，表面粗糙度和表面化学成分）的影响。对过程进行了详细的有限元模拟，以更好地理解过程的物理原理并解释实验结果。激光功率和进给速度是影响加工表面完整性的最重要参数。它已经显示出的机械加工和激光热源参数的适当选择，能够尽量减少激光加热的在LAT过程的不利影响。通过控制激光向工件的热扩散，消除了LAT工艺最重要的障碍之一，这可以为LAT工艺的广泛应用铺平道路。激光功率和进给速度是影响加工表面完整性的最重要参数。它已经显示出的机械加工和激光热源参数的适当选择，能够尽量减少激光加热的在LAT过程的不利影响。通过控制激光向工件的热扩散，消除了LAT工艺最重要的障碍之一，这可以为LAT工艺的广泛应用铺平道路。激光功率和进给速度是影响加工表面完整性的最重要参数。它已经显示出的机械加工和激光热源参数的适当选择，能够尽量减少激光加热的在LAT过程的不利影响。通过控制激光向工件的热扩散，消除了LAT工艺最重要的障碍之一，这可以为LAT工艺的广泛应用铺平道路。