【摘要】：三維(3D)打印技術(shù)因其增材制造特性被認(rèn)為是一種先進(jìn)的制造技術(shù),其中電子束燒結(jié)技術(shù)(EBM)是一種廣泛應(yīng)用的金屬3D打印工藝。該工藝打印的金屬構(gòu)件因常含有微觀孔洞缺陷而降低了力學(xué)性能,特別是疲勞性能。本文針對(duì)電子束燒結(jié)工藝打印的兩種不同形狀的植入體Ti-6Al-4V合金試樣,利用計(jì)算機(jī)斷層掃描技術(shù)(CT)對(duì)試樣內(nèi)的孔洞進(jìn)行了測(cè)量,統(tǒng)計(jì)并分析了孔洞的數(shù)量、體積、形狀以及空間分布情況。結(jié)果表明形狀差異在一定程度上影響了電子束燒結(jié)Ti-6Al-4V合金的微觀孔洞缺陷數(shù)量,但不同試樣的孔洞均以小于0.000 2 mm3的小體積孔洞為主,占孔洞總數(shù)的80%。反映試樣孔洞奇異性的球度值較小,孔洞體積與球度值呈反比。對(duì)自由面的強(qiáng)化燒結(jié)有效降低了試樣近表面的孔洞密度。本文結(jié)論對(duì)利用該工藝制備具有較好抗疲勞性能的醫(yī)用植入體有一定參考價(jià)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.
【作者單位】： 四川大學(xué)深地科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室;四川大學(xué)四川省生物力學(xué)工程實(shí)驗(yàn)室;四川大學(xué)力學(xué)科學(xué)與工程系;四川大學(xué)破環(huán)力學(xué)與工程防災(zāi)減災(zāi)四川省重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(11502152) 省部級(jí)基金(2016JY0812) 成都市科技項(xiàng)目(2015-HM01-00575-SF)
【分類號(hào)】：R318.08;TP391.73
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本文編號(hào)：2171972