三维打印Ti-6Al-4V合金孔洞几何特征与空间分布研究
发布时间：2018-08-08 13:47
【摘要】：三维(3D)打印技术因其增材制造特性被认为是一种先进的制造技术,其中电子束烧结技术(EBM)是一种广泛应用的金属3D打印工艺。该工艺打印的金属构件因常含有微观孔洞缺陷而降低了力学性能,特别是疲劳性能。本文针对电子束烧结工艺打印的两种不同形状的植入体Ti-6Al-4V合金试样,利用计算机断层扫描技术(CT)对试样内的孔洞进行了测量,统计并分析了孔洞的数量、体积、形状以及空间分布情况。结果表明形状差异在一定程度上影响了电子束烧结Ti-6Al-4V合金的微观孔洞缺陷数量,但不同试样的孔洞均以小于0.000 2 mm3的小体积孔洞为主,占孔洞总数的80%。反映试样孔洞奇异性的球度值较小,孔洞体积与球度值呈反比。对自由面的强化烧结有效降低了试样近表面的孔洞密度。本文结论对利用该工艺制备具有较好抗疲劳性能的医用植入体有一定参考价值。
[Abstract]:3D (3D) printing technology is considered to be an advanced manufacturing technology because of its material increasing characteristics. Electron beam sintering (EBM) is a widely used 3D printing process for metals. The mechanical properties, especially the fatigue properties, are reduced because the metal components printed by this process often contain microporous defects. In this paper, two kinds of Ti-6Al-4V alloy samples with different shapes printed by electron beam sintering process were used to measure the holes in the samples by (CT), and the number and volume of the holes were analyzed. Shape and spatial distribution. The results show that the shape difference affects to some extent the number of microporous defects in Ti-6Al-4V alloy sintered by electron beam, but the pores of different samples are mainly small volume holes of less than 0.000 2 mm3, accounting for 80% of the total number of holes. The sphericity value reflecting the singularity of the pore is smaller, and the volume of the pore is inversely proportional to the sphericity value. The enhanced sintering of the free surface effectively reduces the pore density near the surface of the sample. Conclusion this paper has some reference value for the preparation of medical implants with good fatigue resistance.
【作者单位】： 四川大学深地科学与工程教育部重点实验室;四川大学四川省生物力学工程实验室;四川大学力学科学与工程系;四川大学破环力学与工程防灾减灾四川省重点实验室;
【基金】：国家自然科学基金(11502152) 省部级基金(2016JY0812) 成都市科技项目(2015-HM01-00575-SF)
【分类号】：R318.08;TP391.73
，
本文编号：2171972
[Abstract]:3D (3D) printing technology is considered to be an advanced manufacturing technology because of its material increasing characteristics. Electron beam sintering (EBM) is a widely used 3D printing process for metals. The mechanical properties, especially the fatigue properties, are reduced because the metal components printed by this process often contain microporous defects. In this paper, two kinds of Ti-6Al-4V alloy samples with different shapes printed by electron beam sintering process were used to measure the holes in the samples by (CT), and the number and volume of the holes were analyzed. Shape and spatial distribution. The results show that the shape difference affects to some extent the number of microporous defects in Ti-6Al-4V alloy sintered by electron beam, but the pores of different samples are mainly small volume holes of less than 0.000 2 mm3, accounting for 80% of the total number of holes. The sphericity value reflecting the singularity of the pore is smaller, and the volume of the pore is inversely proportional to the sphericity value. The enhanced sintering of the free surface effectively reduces the pore density near the surface of the sample. Conclusion this paper has some reference value for the preparation of medical implants with good fatigue resistance.
【作者单位】： 四川大学深地科学与工程教育部重点实验室;四川大学四川省生物力学工程实验室;四川大学力学科学与工程系;四川大学破环力学与工程防灾减灾四川省重点实验室;
【基金】：国家自然科学基金(11502152) 省部级基金(2016JY0812) 成都市科技项目(2015-HM01-00575-SF)
【分类号】：R318.08;TP391.73
，
本文编号：2171972
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