公开(公告)号：WO2020167670A1

公开(公告)日：2020-08-20

申请号：PCT/US2020/017522

申请日：2020-02-10

申请人： THE REGENTS OF THE UNIVERSITY OF MICHIGAN

发明人： MAZUMDER, Jyotirmoy ,  LU, Yi ,  SUN, Guifang

IPC分类号： B23K26/34 ,  B22F3/105 ,  B23K26/03

摘要： A system and method for monitoring real time stress development of laser additive manufacturing. In some embodiments, the system comprises a laser machine, a laser deposition head, an illumination laser, a line laser, two CCD cameras, a spectrum meter, a computer, and an ultrasonic shot head. The CCD camera can record the molten pool height and the line laser can be directed behind the molten pool to measure the shape and/or height of the newly formed layer. The computer builds a real-time FEM model of the layer, calculates the displacement of the solidified surface, and then calculates the stress formed in the layer. The spectrum meter monitors for non-stress induced defects. The data is transferred into a computer to determine whether defects will occur and control the laser deposition and ultrasonic shot head to treat the area and prevent emergence of stress induced defect.

公开(公告)号：WO2016032953A1

公开(公告)日：2016-03-03

申请号：PCT/US2015/046531

申请日：2015-08-24

申请人： THE REGENTS OF THE UNIVERSITY OF MICHIGAN

发明人： MAZUMDER, Jyotirmoy ,  CHOI, Jeongyong

IPC分类号： B23K26/342 ,  B23K26/354 ,  B23K26/40 ,  B23K26/08 ,  B23K26/03

CPC分类号： B23K26/342 ,  B23K26/0006 ,  B23K26/0081 ,  B23K26/034 ,  B23K26/083 ,  B23K26/0861 ,  B23K26/0869 ,  B23K26/0884 ,  B23K26/144 ,  B23K26/34 ,  B23K26/346 ,  B23K26/702 ,  B23K26/703 ,  B23K2201/001 ,  B23K2203/08 ,  B23K2203/26 ,  B23P15/04 ,  B33Y10/00 ,  B33Y30/00 ,  B33Y50/02 ,  B33Y80/00 ,  C22F1/10

摘要： A method and apparatus for direct writing of single crystal super alloys and metals. The method including heating a substrate to a predetermined temperature below its melting point; using a laser to form a melt pool on a surface of the substrate, wherein the substrate is positioned on a base plate, and wherein the laser and the base plate are movable relative to each other, the laser being used for direct metal deposition; introducing a superalloy powder to the melt pool; and controlling the temperature of the melt pool to maintain a predetermined thermal gradient on a solid and liquid interface of the melt pool so as to form a single crystal deposit on the substrate. The apparatus configured to generally achieve the aforementioned method.

摘要翻译： 用于直接写入单晶超级合金和金属的方法和装置。 该方法包括将基底加热至低于其熔点的预定温度; 使用激光在所述基板的表面上形成熔池，其中所述基板位于基板上，并且其中所述激光器和所述基板可相对于彼此移动，所述激光用于直接金属沉积; 在熔池中引入超合金粉末; 并且控制熔池的温度以在熔池的固体和液体界面上保持预定的热梯度，以便在衬底上形成单晶沉积物。 该装置被配置为一般地实现上述方法。