关键词: 316L不锈钢粉末, 电子束选区熔化成形, 快速制造, 温度场, 超声换能器, 电负载, 调频, 有限元, 振动特性

Abstract: Aimed at the problem that metal powder is easily break out of the powder bed under the action of high-energy electron beam, two kind shapes of 316L stainless steel powder are investigated, and the mixture powder which has the good forming ability and high counteract ability again the high-energy electron beam are gained. Aimed at the characteristic of temperature field during electron beam selective melting ( EBSM ), the rotating and slicing methods of multi-connect areas are adopted, which not only solve the problem of first line scan balling and the matching between the regions of the part and the temperature distribution, but also simplify the data processing of CAD model. Under the research on the materials and scanning methods, some three-dimensional parts are manufactured, the interfaces between the layers are fully metallurgical bonding, no unmelted particle and voids are founded in the part, the microstructure of the three-dimension forming parts are fine and cellular dendrites. The ultimate strength and elongation of the parallel and the vertical testing samples are 600 MPa, 40 % and 560 MPa, 35 %, respectively.

Key words: 316L stainless steel powder, Electron beam selective melting, Rapid manufacturing, Temperature field, electric load, FEM, frequency modification, vibration characteristics, ultrasonic transducer