激光表面熔化 Ti6Al4V 合金的微观结构、力学性能和磨损性能。
Microstructure, mechanical and wear properties of laser surface melted Ti6Al4V alloy.
机构信息
W.M. Keck Biomedical Materials Research Laboratory, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920, USA.
W.M. Keck Biomedical Materials Research Laboratory, School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164-2920, USA.
出版信息
J Mech Behav Biomed Mater. 2014 Apr;32:335-344. doi: 10.1016/j.jmbbm.2013.12.001. Epub 2013 Dec 8.
Laser surface melting (LSM) of Ti6Al4V alloy was carried out with an aim to improve properties such as microstructure and wear for implant applications. The alloy substrate was melted at 250W and 400W at a scan velocity of 5mm/s, with input energy of 42J/mm(2) and 68J/mm(2), respectively. The results showed that equiaxed α+β microstructure of the substrate changes to mixture of acicular α in β matrix after LSM due to high cooling rates in the range of 2.25×10(-3)K/s and 1.41×10(-3)K/s during LSM. Increasing the energy input increased the thickness of remelted region from 779 to 802µm and 1173 to 1199µm. Similarly, as a result of slow cooling rates under present experimental conditions, the grain size of the alloy increased from 4.8μm to 154-199μm. However, the hardness of the Ti6Al4V alloy increased due to LSM melting and resulted in lowest in vitro wear rate of 3.38×10(-4)mm(3)/Nm compared to untreated substrate with a wear rate of 6.82×10(-4)mm(3)/Nm.
采用激光表面熔化（LSM）技术处理 Ti6Al4V 合金，旨在改善其微观结构和耐磨性等性能，以满足植入物应用的需求。在扫描速度为 5mm/s 的条件下，分别以 250W 和 400W 的功率将合金基底熔化，输入能量为 42J/mm(2)和 68J/mm(2)。结果表明，由于 LSM 过程中冷却速率较高（范围在 2.25×10(-3)K/s 和 1.41×10(-3)K/s），基底的等轴 α+β 微观结构在 LSM 后转变为针状α在β基体中的混合物。增加能量输入会使再熔化区域的厚度从 779µm 增加到 802µm 和 1173µm 增加到 1199µm。同样，由于在当前实验条件下冷却速率较慢，合金的晶粒尺寸从 4.8μm 增加到 154-199μm。然而，由于 LSM 熔化，Ti6Al4V 合金的硬度增加，导致体外磨损率最低，为 3.38×10(-4)mm(3)/Nm，而未处理的基底磨损率为 6.82×10(-4)mm(3)/Nm。
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