层厚对内燃机用激光选区熔化成形Ti-5Al-2.5Sn钛合金组织与性能的影响
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摘要
研究了层厚对激光选区熔化(SLM)技术成形Ti-5Al-2.5Sn(Ti-Al-Sn)钛合金试样致密度、显微组织和力学性能的影响规律。结果表明,随着层厚的减小,激光体的能量密度将会提高,层厚度达到60μm时也同样能够制得致密度大于99.0%的Ti-Al-Sn合金试样。采用SLM工艺得到的Ti-Al-Sn合金试样主要包括3种显微组织,分别为针形α′马氏体组织、针形α′马氏体+岛形αm混合组织以及单纯的岛形αm组织。当层厚增加以及扫描速率变慢时,试样的冷却速率也逐渐降低。当层厚增加后,各个Ti-Al-Sn试样的力学性能测试结果都发生了降低的现象。各个层厚下得到的Ti-Al-Sn试样在室温下进行拉伸测试时都表现为韧性断裂特征。
The effect of layer thickness on the density, microstructure and mechanical properties of ti-5 al-2.5 Sn(Ti-Al-Sn) titanium alloy was studied. The results show that with the decrease of thickness, the energy density of the laser body will be increased, and the Ti-Al-Sn alloy sample with a density greater than 99.0% can be produced when the layer thickness reaches 60 mu m.Using SLM technology of Ti-Al-Sn alloys mainly includes three kinds of microstructure, the needle alpha′ martensite structure respectively, needle alpha′ martensite + island shape alpha m mixed groups and the pure form of alpha m group. As the thickness of the layer increases and the scanning rate slows down, the cooling rate of the sample decreases gradually. When the thickness of the layer was increased, the mechanical properties of the ti-al-sn samples were reduced. The Ti-Al-Sn samples obtained at different layers were characterized by ductile fracture at room temperature.
The effect of layer thickness on the density, microstructure and mechanical properties of ti-5 al-2.5 Sn(Ti-Al-Sn) titanium alloy was studied. The results show that with the decrease of thickness, the energy density of the laser body will be increased, and the Ti-Al-Sn alloy sample with a density greater than 99.0% can be produced when the layer thickness reaches 60 mu m.Using SLM technology of Ti-Al-Sn alloys mainly includes three kinds of microstructure, the needle alpha′ martensite structure respectively, needle alpha′ martensite + island shape alpha m mixed groups and the pure form of alpha m group. As the thickness of the layer increases and the scanning rate slows down, the cooling rate of the sample decreases gradually. When the thickness of the layer was increased, the mechanical properties of the ti-al-sn samples were reduced. The Ti-Al-Sn samples obtained at different layers were characterized by ductile fracture at room temperature.
引文
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[5] PANDA B N,GARG A,SHANKHWAR K.Empirical investigation of environmental characteristic of 3-D additive manufacturing process based on slice thickness and part orientation [J].Measurement,2016(86):293-300.
[4] ABOULKHAIR N T,MASKERY I,TUCK C,et al.On the formation of AlSi10Mg single track and layers in selective laser melting:microstructure and nano-mechanical properties [J].Journal of Materials Processing Technology,2016(230):88-98.
[5] 李永奎,权纯逸,陆善平,等.TA15 钛合金薄壁焊接件热处理校形研究[J].金属学报,2016(3):281-288.
[6] WANG Z M,GUAN K,GAO M,et al.The microstructure and mechanical properties of deposited-IN718 by selective laser melting[J].Journal of Alloys and Compounds,2012(513):518-523.
[7] MA M M,WANG Z M,WANG D Z,et al.Control of shape and performance for direct laser fabrication of precision large-scale metal parts with 316L stainless steel[J].Optics & Laser Technology,2013(45):209-216.
[8] YU H C,YANG J J,YIN J,et al.Comparison on mechanical anisotropies of selective laser melted Ti-6Al-4V alloy and 304 stainless steel[J].Materials Science and Engineering,2017(695):92-100.
[9] YABLOKOVA G,SPEIRS M,VAN HUMBEECK J,et al.Rheological behavior of β-Ti and NiTi powders produced by atomization for SLM production of open porous orthopedic implants[J].Powder Technology,2015(283):199-209.
[10] ZHOU Y,WEN S F,SONG B,et al.A novel titanium alloy manufactured by selective laser melting:microstructure,high temperature oxidation resistance[J].Materials & Design,2016(89):1199-1204.
[11] WEI K W,WANG Z M,ZENG X Y.Preliminary investigation on selective laser melting of Ti-5Al-2.5 Sn α-Ti alloy:from single tracks to bulk 3D components[J].Journal of Materials Processing Technology,2017(244):73-85.