选区激光熔化成形TiB2/Al-Si-Mg大尺寸复杂构件
Large complex components of TiB2/Al-Si-Mg formed by selective laser melting
廉清 1肖亚开 2孙华 1赵鑫光 2尹健 2吴一 1王洪泽 1郑凯特 3黄洁3
作者信息
- 1. 上海交通大学 材料科学与工程学院,上海 200240
- 2. 上海卫星工程研究所 机械技术工程研究室,上海 201109
- 3. 中国商飞上海飞机制造有限公司,上海 201324
- 折叠
摘要
选区激光熔化(SLM)成形大尺寸复杂构件厚度多样、成形高度较高、方向复杂,需要研究构件微观组织均匀性和力学性能稳定性.本文以SLM成形TiB2/Al-Si-Mg复合材料为研究对象,分析复合材料多级微观组织,对比不同成形厚度、高度、方向下复合材料的力学性能.结果表明:复合材料表现出熔池特征结构,细小等轴晶粒组织均匀分布且随机取向,纳米TiB2颗粒在材料内部弥散分布.随成形厚度增加,复合材料伸长率保持稳定,抗拉强度受本征热处理影响略微增大;在不同成形高度下,复合材料抗拉强度和伸长率保持稳定;在不同成形方向下,复合材料抗拉强度保持稳定,伸长率受熔池结构影响在水平方向略高.基于以上结果,成功制备大飞机舱门铰链臂(588 mm×318 mm×470 mm)复杂结构件.
Abstract
Large and complex components processed by selective laser melting(SLM)have various thicknesses and complex orientations.Thus,it is necessary to study the microstructure uniformity and the mechanical property stability of components.In this paper,TiB2/Al-Si-Mg composite processed by SLM was studied.Multiple characterization techniques were used to analyze the multistage microstructure of the composite,and mechanical properties of the composite were compared under different thicknesses,heights and orientations.The results show that the composite exhibits the characteristic melting pool structure.Fine equiaxed grains are uniformly distributed and randomly oriented.Nano-TiB2 particles are uniformly distributed in the composite.With the increase of thickness,the elongation of the composite remains stable,while the ultimate tensile strength increases slightly due to the influence of intrinsic heat treatment.The ultimate tensile strength and elongation of the composite remain stable at different heights.In different orientations,the ultimate tensile strength of the composite remains stable,while the elongation is slightly higher in the horizontal orientation due to the influence of the melting pool structure.Based on this study,the door hinge arm(588 mm×318 mm×470 mm)with complex structure was successfully fabricated.
关键词
选区激光熔化/TiB2/Al-Si-Mg复合材料/微观组织/力学性能/复杂构件Key words
selective laser melting/TiB2/Al-Si-Mg composite/microstructure/mechanical property/complex component引用本文复制引用
基金项目
上海市科技计划扬帆专项(23YF1419400)
上海市科技计划扬帆专项(23YF1419800)
国家自然科学基金(52075327)
国家自然科学基金(52004160)
国家商用飞机制造工程技术研究中心创新基金(3-0410300-031)
出版年
2024
NETL
NSTL
万方数据