On the mechanical behaviour of titanium alloy TiAl6V4 manufactured by selective laser melting: Fatigue resistance and crack growth performance
On the mechanical behaviour of titanium alloy TiAl6V4 manufactured by selective laser melting: Fatigue resistance and crack growth performance
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DOI：
10.1016/j.ijfatigue.2012.11.011
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发表时间：
2013-03-01
影响因子：
6
通讯作者：
Maier, H. J.
中科院分区：
文献类型：
--
作者：
Lenders, S.;Thoene, M.;Maier, H. J.
直接制造（DM），也称为增材制造或增材层制造，由于直接从设计数据生产轻质金属部件的可行性，最近已经获得了很多兴趣。选择性激光熔化是一种非常有前途的DM技术，用于提供具有相对高的表面质量和体积密度的近净形部件。尽管如此，工艺引起的缺陷，即微米尺寸的孔和加工时的残余应力，需要考虑未来的应用，例如在航空航天和生物医学领域。此外，疲劳载荷是此类部件的关键情况，需要进行彻底的研究。因此，目前的研究旨在建立健全的组织缺陷性能的关系，循环载荷下的选择性激光熔化处理的TiAl6V4合金。采用力学测试，热等静压，电子显微镜和计算机断层扫描表明，微米尺寸的孔隙主要影响疲劳强度，而残余应力有很大的影响疲劳裂纹扩展。(C)2012爱思唯尔有限公司保留所有权利。
Direct manufacturing (DM), also referred to as additive manufacturing or additive layer manufacturing, has recently gained a lot of interest due to the feasibility of producing light-weight metallic components directly from design data. Selective laser melting is a very promising DM technique for providing near net shape components with relative high surface quality and bulk density. Still, process induced imperfections, i.e. micron sized pores and residual stresses upon processing, need to be considered for future application, e.g. in the aerospace and biomedical sectors. Moreover, fatigue loading is a critical scenario for such components and needs to be investigated thoroughly. Consequently, the current study aims at establishing sound microstructure-defect-property relationships under cyclic loading for a TiAl6V4 alloy processed by selective laser melting. Employing mechanical testing, hot isostatic pressing, electron microscopy and computer tomography it is shown that the micron sized pores mainly affect fatigue strength, while residual stresses have a strong impact on fatigue crack growth. (C) 2012 Elsevier Ltd. All rights reserved.