论文部分内容阅读
电子束快速成形是一种利用金属丝材沉积直接制造金属零件的新型增材制造技术。用电子束快速成形方法制备了Ti-6Al-4V合金,对其显微组织和快速成形态、退火态、热等静压态下的力学性能进行了研究。电子束快速成形Ti-6Al-4V合金的低倍组织典型特征为沿堆积高度方向生长的贯穿多层沉积层的粗大柱状晶以及分布于层间及堆积路径间的明暗相间的带状条纹。各种状态下室温拉伸性能均有明显的方向性,其中X向、Y向强度较高,Z向强度低但塑性较好;消应力退火处理对室温拉伸性能没有明显影响;热等静压处理后材料的抗拉伸强度显著降低,但具有良好的塑性与韧性,同时能够明显降低高周疲劳性能数据的分散性。快速成形态及退火态室温拉伸性能均可满足AMS4999标准的要求,但与锻件标准HB5432相比仍有差距。
Electron Beam Rapid Prototyping is a novel additive manufacturing technology that uses metal wire deposition to make metal parts directly. The Ti-6Al-4V alloy was prepared by electron beam rapid prototyping, and the mechanical properties of Ti-6Al-4V alloy under the conditions of microstructure, rapid prototyping, annealing and hot isostatic pressing were studied. The microstructure of Ti-6Al-4V alloy by electron beam rapid prototyping is characterized by coarse columnar grains growing in multilayered sediments along the deposition height and banded stripes distributed between layers and deposition paths. Tensile properties at room temperature all have obvious directionality under various conditions, of which X-direction, Y-direction strength is higher, Z-direction strength is lower but the plasticity is better; stress relief annealing has no obvious effect on the tensile properties at room temperature; Tensile strength of the pressed material is significantly reduced, but has good ductility and toughness, while significantly reducing the high-cycle fatigue performance data dispersion. Rapid prototyping and annealing at room temperature tensile properties can meet the requirements of the AMS4999 standard, but compared with the forging standard HB5432 is still a gap.