Morphologies, microstructures, and mechanical properties of samples produced using laser metal deposition with 316 L stainless steel wire
Morphologies, microstructures, and mechanical properties of samples produced using laser metal deposition with 316 L stainless steel wire
复制标题
DOI：
10.1016/j.optlaseng.2017.02.008
复制
发表时间：
2017-07
影响因子：
4.6
通讯作者：
X. Xu;Gaoyang Mi;Yu Luo;P. Jiang;X. Shao;Chunming Wang
中科院分区：
文献类型：
--
作者：
X. Xu;Gaoyang Mi;Yu Luo;P. Jiang;X. Shao;Chunming Wang
带填充剂的激光金属沉积(LMD)具有材料沉积效率高、表面质量好、材料损耗少、工艺环境清洁、无金属粉尘污染等优点，已被证明是一种有效的添加剂制造方法。本研究采用4000W连续波光纤激光器和弧焊机，在优化的工艺条件下，在316 mm L不锈钢表面成功地沉积了单珠和10层样品。结果表明，在合适的工艺参数下，可以得到沉积高度大、侧面光滑的层状样品。均匀的组织为细小的胞状和网状奥氏体晶，层与层之间冶金结合良好，呈奥氏体型凝固。晶界析出的铁素体为细小均匀的亚晶组织。在沉积区中部有较高的显微硬度(205-226 HV)，而50层样品的抗拉强度达到669 Mpa。此外，断口表面出现了明显的韧窝，证明了韧性断裂。
Laser metal deposition (LMD) with a filler has been demonstrated to be an effective method for additive manufacturing because of its high material deposition efficiency, improved surface quality, reduced material wastage, and cleaner process environment without metal dust pollution. In this study, single beads and samples with ten layers were successfully deposited on a 316 L stainless steel surface under optimized conditions using a 4000 W continuous wave fibre laser and an arc welding machine. The results showed that satisfactory layered samples with a large deposition height and smooth side surface could be achieved under appropriate parameters. The uniform structures had fine cellular and network austenite grains with good metallurgical bonding between layers, showing an austenite solidification mode. Precipitated ferrite at the grain boundaries showed a subgrain structure with fine uniform grain size. A higher microhardness (205–226 HV) was detected in the middle of the deposition area, while the tensile strength of the 50 layer sample reached 669 MPa. In addition, ductile fracturing was proven by the emergence of obvious dimples at the fracture surface.