激光粉末床熔合加工316L零件激光热处理的疲劳寿命和表面质量

T. Rautio, M. Hietala, Marika Hirvimäki, J. Mäkikangas, J. Kumpula, A. Järvenpää
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引用次数: 1

摘要

采用两组能量输入对激光粉末床熔合(LPBF)制造的316L零件进行了激光热处理,并对其效果进行了研究。在显微组织分析、硬度测量和力学性能测试、表面粗糙度和疲劳寿命等方面,将激光热处理后的组织与建筑材料进行了比较。结果表明,LHT可以通过多种方式提高LPBF制造的316L零件的材料性能。在更高的能量密度下,表面粗糙度几乎减半,同时疲劳强度增加一倍,硬度和极限抗拉强度没有明显的损失。高温作用下的表面显微组织演变为粗柱状枝晶和细胞状晶粒结构的混合体。根据这项工作的发现,LHT似乎是提高LBPF 316L性能的一个有吸引力的工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fatigue Life and Surface Quality of Laser Powder Bed Fusion Manufactured 316L Parts by Laser Heat Treatment
Laser heat treatment (LHT) with two sets of energy inputs was applied to laser powder bed fusion (LPBF) manufactured 316L parts and its effects were studied in this research. LHT processed structures were compared to the as built material in terms of microstructural analysis, hardness measurements and mechanical testing, surface roughness and fatigue life. The results show that the LHT can be used to enhance the material properties of LPBF manufactured 316L parts in several ways. With the higher energy density, the surface roughness could be nearly halved while the fatigue strength was simultaneously doubled with no meaningful recorded loss in hardness or ultimate tensile strength. Microstructural evolution at the surface due to the LHT resulted in a mixture of coarse columnar dendrite and cellular grain structure. According to the findings of this work, LHT appears as an attractive tool for enhancing the properties of LBPF 316L.
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