Texture control of Inconel 718 superalloy in laser additive manufacturing by an external magnetic field
Texture control of Inconel 718 superalloy in laser additive manufacturing by an external magnetic field
复制标题
DOI：
10.1007/s10853-019-03569-7
复制
发表时间：
2019-03
影响因子：
4.5
通讯作者：
Yachao Wang;Jing Shi
中科院分区：
文献类型：
--
作者：
Yachao Wang;Jing Shi
由于集中热源和快速冷却，纹理控制是金属零件激光辅助增材制造的主要挑战。在这项研究中，提出了一种新型磁场辅助激光增材制造方法来获得高度定向的织构。 Inconel 718 样品在不同强度和不同激光功率水平的横向磁场下沉积。使用各种材料表征技术（包括 SEM、EDS 和 EBSD）仔细分析竣工材料的元素分布、晶粒形态和纹理。结果表明，磁场将枝晶间的微偏析模式从连续链改变为离散形态。沉积材料的<110>方向倾向于与横向磁场对齐。杂散晶体的取向更严格地受到垂直热通量和横向磁场的约束，导致水平横截面上高度取向的<100>织构和垂直横截面上的<110>织构。还观察到，通过施加横向磁场，平均晶界取向差角从32°显着减小到19°，均匀密度的最大倍数从3.0增加到5.3。研究了激光功率和磁场强度的影响，并讨论了潜在的取向效应。
Texture control is a major challenge in laser-assisted additive manufacturing of metal part due to the focused heat source and rapid cooling. In this study, a novel magnetic-field-assisted laser additive manufacturing method is proposed to obtain highly oriented texture. Inconel 718 samples are deposited under a transverse magnetic field of various intensities and different levels of laser power. The elemental distribution, grain morphology, and texture of as-built material are carefully analyzed using various material characterization techniques, including, SEM, EDS, and EBSD. The results indicate that the magnetic field changes the interdendritic microsegregation pattern from a continuous chain to discrete morphology. The <110> direction of deposited material tends to align with the transverse magnetic field. The orientation of stray crystals is more strictly constrained by both vertical heat flux and transverse magnetic field, resulting in a highly oriented <100> texture on horizontal cross-section and <110> texture on the vertical cross-section. It is also observed that by applying the transverse magnetic field, the average grain boundary misorientation angle significantly decreases from 32° to 19°, and the maximum multiple of uniform density increases from 3.0 to 5.3. The effects of laser power as well as magnetic field strength are investigated, and the underlying orientation effect is discussed.