Browsing by Subject "cracking behavior"

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    Porosity Development and Cracking Behavior of Al-Zn-Mg-Cu Alloys Fabricated by Selective Laser Melting
    (University of Texas at Austin, 2017) Qi, Ting; Zhu, Haihong; Yin, Jie; Chen, Baijin; Hu, Zhiheng; Zeng, Xiaoyun
    Selective laser melting (SLM) of the 7xxx series Al alloy (Al-Zn-Mg-Cu) faces more challenge than other series aluminum alloy such as Al-Si system because of the high hot-cracking sensitivity. The porosity development and crack behavior of Al-Zn-Mg-Cu alloys fabricated at various scanning speeds in SLM process, as well as the influence of molten pool geometry were systematically investigated in this paper. Results show that the relative density over 99% can be achieved when the applied scanning speed is 150 mm/s. However, cracks are observed in almost all the as-deposited samples. The morphology, distribution and density of cracks were varied with the different molten pool geometry and scanning speed.