Deposition of Ti-6Al-4V using a high power diode laser and wire, Part II: Investigation on the mechanical properties
Deposition of Ti-6Al-4V using a high power diode laser and wire, Part II: Investigation on the mechanical properties
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DOI：
10.1016/j.surfcoat.2008.03.028
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发表时间：
2008-06-25
影响因子：
5.4
通讯作者：
Segal, Joel
中科院分区：
文献类型：
--
作者：
Mok, Sui Him;Bi, Guijun;Segal, Joel
实验证明，采用高功率半导体激光器和Ti6Al4V线材进行沉积，沉积速度快，沉积质量好。沉积件良好的力学性能是该工艺真正应用的前提。对其主要力学性能，包括显微硬度和拉伸性能进行了研究。单珠壁被沉积。试件按照英国力学测试标准从沉积的墙体上加工而成，发现外延柱状晶平行于建筑方向生长。观察到了两个沉积层之间的带区，这是由于先前沉积层的重熔和随后的每一次沉积过程中发生的多次热循环造成的。结果表明，在相同的激光功率下，具有较高横移速度的试件具有与较低横移速度的试件相近或略高的硬度。随着工艺参数的不同，硬度变化小于10%。在700℃空气循环炉中对沉积后的样品进行了2 h的拉伸性能研究，结果表明，沉积样品的拉伸性能优于去应力处理的样品。这是由于消除应力后残余压应力的降低和组织的粗化所致。拉伸性能也显示出对测试方向的依赖关系。所检测的所有沉积样品的拉伸性能都与铸态和锻造材料的性能相匹配。(C)2008爱思唯尔B.V.保留所有权利。
The deposition with high power diode laser and Ti6Al4V wire was verified as a process which can provide a high deposition rate with good quality. Sound mechanical properties of the deposited parts are the prerequisites for the real applications of this process. In this pamper, the main mechanical properties including micro-hardness and tensile properties were investigated. Single bead walls were deposited. Test pieces were machined from the deposited walls according to the British standard for the mechanical tests.The epitaxial columnar grains were found growing parallel to the building direction. A band region was observed between two deposited layers, which resulted from the remelting of previously deposited layer and multiple thermal cycles that had occurred with each subsequent deposition pass. The results showed that with the same laser power, the built samples with higher traverse speed possess similar or slightly higher hardness than the samples built with lower traverse speed. The hardness varied less than 10% with different sets of parameters. The investigations on the tensile properties were carried out with the samples as deposited and stress relieved at 700 degrees C in an air circulating furnace for 2 h. The as deposited samples showed better tensile properties than the stress relieved ones. This results from the reduction of the compressive residual stresses and the coarser microstructure after stress relief. The tensile properties also showed dependence on the direction of the test carried out. All the examined tensile properties of the as deposited samples matched properties of the as cast and wrought material. (C) 2008 Elsevier B.V. All rights reserved.