本文關(guān)鍵詞： Ti-Al-V合金 選區(qū)激光熔化成型 顯微組織 多孔網(wǎng)格結(jié)構(gòu)　出處：《應(yīng)用激光》2017年02期 　論文類型：期刊論文

【摘要】：Ti-6Al-4V合金具有強(qiáng)度高、抗蝕性優(yōu)異、生物相容性好等優(yōu)點(diǎn),常用于制造醫(yī)用多孔的植入體材料,但對(duì)多孔材料結(jié)構(gòu)的成型工藝有一定的約束。基于選區(qū)激光熔化成型技術(shù)(Selective Laser Melting,SLM),結(jié)合自行設(shè)計(jì)的拓?fù)鋬?yōu)化多孔網(wǎng)格結(jié)構(gòu),按照拓?fù)鋬?yōu)化的結(jié)果重新建模成單元結(jié)構(gòu),進(jìn)行了3組特殊結(jié)構(gòu)(螺旋結(jié)構(gòu)、拱形橋結(jié)構(gòu)、薄壁件與小孔)的制造實(shí)驗(yàn),并且分析對(duì)比了熱處理前后SLM制造的Ti-6Al-4V合金的顯微組織和拉伸性能。研究結(jié)果表明,SLM成型的三種螺旋結(jié)構(gòu)中,除30°螺旋結(jié)構(gòu)以外,其他兩種都能夠完整成形,滿足拓?fù)鋯卧Y(jié)構(gòu)成形角度(≥45°)的制造,30°螺旋結(jié)構(gòu)通過在迎向刮刀銳角面下加少量支撐也能成形;拱形橋?qū)嶒?yàn)中,能夠完整成型不發(fā)生塌陷的最大拱橋尺寸為φ=8mm,推導(dǎo)出最大的可懸垂長(zhǎng)度為0.70mm,滿足拓?fù)鋯卧Y(jié)構(gòu)最大拱橋尺寸(8mm)要求;壁厚為0.10mm的薄壁結(jié)構(gòu)由于激光光斑尺寸的約束,成形尺寸增大了0.05mm,可能會(huì)造成1mm邊長(zhǎng)尺寸成單元拓?fù)浣Y(jié)構(gòu)孔隙率的減小;小孔實(shí)驗(yàn)成形最小孔徑為0.10mm,滿足多孔拓?fù)鋬?yōu)化結(jié)構(gòu)最小孔制作要求;SLM制造直接態(tài)和熱處理態(tài)Ti-6Al-4V合金試樣基本的力學(xué)性能均能達(dá)到ISO制定力學(xué)性能標(biāo)準(zhǔn),且超過鑄造態(tài)的水平,但延展性能仍不及鍛件。熱處理態(tài)比直接態(tài)的延展性好,直接態(tài)組織為針狀的α′相馬氏體組織;當(dāng)熱處理溫度達(dá)到750℃時(shí),α′相會(huì)開始發(fā)生擴(kuò)散分解,從而在相界面析出白色的β相小顆粒。
[Abstract]:Ti-6Al-4V alloys have many advantages such as high strength, excellent corrosion resistance and good biocompatibility. However, there are some constraints on the forming process of porous material structure. Based on selective laser melting technology, selective Laser melting process (SLM). Combined with the self-designed topology optimization porous mesh structure, according to the result of topology optimization, the unit structure is remodeled, and three groups of special structures (spiral structure, arch bridge structure) are carried out. The microstructure and tensile properties of Ti-6Al-4V alloy made by SLM before and after heat treatment were analyzed and compared. Among the three kinds of helical structures formed by SLM, except 30 擄helical structure, the other two kinds of helical structures can be formed completely, which can satisfy the manufacturing of the forming angle (鈮，

本文編號(hào)：1458437