Solidification crack propagation and morphology dependence on processing parameters in AA6061 from ultra-high-speed x-ray visualization
Solidification crack propagation and morphology dependence on processing parameters in AA6061 from ultra-high-speed x-ray visualization
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DOI：
10.1016/j.addma.2021.101959
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发表时间：
2021-06-01
影响因子：
11
通讯作者：
Rollett, Anthony D.
中科院分区：
文献类型：
--
作者：
Kouraytem, Nadia;Chiang, Po-Ju;Rollett, Anthony D.
凝固或热裂纹是许多金属合金中常见的缺陷，可能会导致附加制造的零件质量恶化。在这项研究中，超高速X射线照相实验能够观察和表征在整体式AA6061基板上形成的热裂纹束。裂纹束的形成与熔池特性和气孔形成有关。文中还给出了裂纹从孔洞开始扩展的情况下的裂纹扩展速率。文中还描述了两种相关的孔隙形成，即小孔孔洞和裂纹重熔孔洞。本研究的结果将有助于凝固裂纹理论模型和数值模型的验证。
Solidification or hot cracks are commonly observed defects in a number of metal alloys and may lead to deterioration of additively manufactured parts quality. In this study, ultra-high-speed x-ray radiography experiments enable the observation and characterization of bundles of hot-cracks that form in monobloc AA6061 substrate. The crack bundles are related to meltpool characteristics and pore formation. Crack propagation rate is also presented for the case of a crack that initiates from a pore. Two types of relevant pore formation are also described, namely keyhole porosity and crack-remelting porosity. The results of this study are expected to facilitate the validation of theoretical and numerical models of solidification cracking.