This paper focuses on the machinability of additively manufactured steel alloys (316L stainless steel and 18Ni300 Maraging steel) by reference to their conventional metallurgical conditions. The machinability of both metallurgical conditions has been evaluated by longitudinal turning tests under laboratory conditions using two different cutting tool geometries (flat rake face and chip-breaker geometry) and covering different cutting speeds, depths of cut and feed values. Cutting forces, chip morphology and surface roughness were investigated as machinability indicators. The influence of chip-breaker on process performance was also analysed. For a comprehensive discussion of the results, microstructure, chemical composition, surface roughness and mechanical strength of both metallurgical conditions were studied. The paper quantitatively demonstrates that despite the higher mechanical strength of additively manufactured alloys, no significant power requirements were verified for the finishing cutting of tested alloys, when compared with conventional materials. Also noteworthy, is the surface quality improvement of the printed samples due to the most favourable conditions for chip formation. The usage of a chip breaker insert had higher impact on reducing required cutting energy than on controlling chip geometry.

本文重点介绍了增材制造钢合金（316L 不锈钢和 18Ni300 马氏体时效钢）的机械加工性，参考了它们的常规冶金条件。两种冶金条件的可加工性已通过实验室条件下的纵向车削试验进行评估，使用两种不同的切削刀具几何形状（平前刀面和断屑槽几何形状）并涵盖不同的切削速度、切削深度和进给值。切削力、切屑形态和表面粗糙度被研究作为可加工性指标。还分析了断屑槽对工艺性能的影响。为了对结果进行全面讨论，研究了两种冶金条件的微观结构、化学成分、表面粗糙度和机械强度。该论文定量地表明，尽管增材制造的合金具有更高的机械强度，但与传统材料相比，测试合金的精切削没有显着的功率要求。同样值得注意的是，由于切屑形成的最有利条件，印刷样品的表面质量得到了改善。与控制切屑几何形状相比，使用断屑槽刀片对降低所需切削能量的影响更大。