选择性激光熔覆与精密锻造联合成形工艺对Ti6Al4V合金显微组织与力学性能的影响（英文）

发布时间：2018-05-18 12:39

本文选题：选择性激光熔覆 + TiAlV合金　；参考：《Transactions of Nonferrous Metals Society of China》2017年05期

【摘要】：为提高合金的力学性能,在温度950°C不同应变和应变速率条件下对SLM成形的Ti6Al4V合金试样进行精密锻造处理,使用光学显微镜和X射线衍射仪分析原试样和锻造处理试样在水平和竖直截面内显微组织的演化,并计算了每个截面的孔隙率。结果表明,大应变速率以及大变形量可以改善显微组织并降低孔隙率,进而提高材料的疲劳性能。精密锻造处理后的试样显微硬度小于SLM成形原件的显微硬度;同时,精密锻造处理试样在水平截面和竖直截面的显微硬度差小于SLM成形原件在两个截面的显微硬度差。这说明精密锻造工艺可以改善SLM成形零件的各向异性。
[Abstract]:In order to improve the mechanical properties of the SLM alloy, precision forging treatment was carried out on the Ti6Al4V alloy specimen formed by SLM at different strain and strain rates at 950 掳C. The microstructure evolution of the original and forged specimens in horizontal and vertical sections was analyzed by optical microscope and X-ray diffractometer, and the porosity of each section was calculated. The results show that high strain rate and large amount of deformation can improve the microstructure and decrease the porosity, thus improving the fatigue properties of the materials. The microhardness of the specimen after precision forging is smaller than that of the original SLM, and the microhardness difference between the horizontal section and the vertical section of the precision forging sample is smaller than that of the original part of SLM forming at the two sections. This shows that precision forging process can improve the anisotropy of SLM forming parts.
【作者单位】：西安交通大学机械工程学院;
【基金】：Project(50975222)supported by the National Natural Science Foundation of China Project(2014ko8-34)supported by the Industrial Research Project of Shaanxi Province,China
【分类号】：TG146.23;TG319;TG665

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