A quantitative study of thermal cycling along the build direction of Ti-6Al-4V produced by laser powder bed fusion
A quantitative study of thermal cycling along the build direction of Ti-6Al-4V produced by laser powder bed fusion
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DOI：
10.1016/j.matdes.2022.111458
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发表时间：
2022-12-15
影响因子：
8.4
通讯作者：
Swygenhoven, Helena Moens-Van
中科院分区：
文献类型：
--
作者：
Chen, Ming;Simonelli, Marco;Swygenhoven, Helena Moens-Van
在激光-粉末床融合(L-PBF)过程中，当激光与上面相邻的轨道或层相互作用时，印刷材料经历了多次快速加热和冷却循环。复杂的热历史会影响印刷件的最终组织和宏观性能。在这项工作中，我们演示了如何使用传输模式下的高速原位X射线衍射来测量Ti-6Al-4V单道壁内的温度分布和冷却速率。在顶层激光重熔过程中，温度超过横截面温度(TE。TI1252K)被测量到地表以下150克。观测到的最大降温速率从表层的106K/S，到135gm深度的105K/S和255gm深度的104K/S。根据各种晶相的时间演化，估算了熔池的尺寸和熔池周围的高温E区。由薄壁上的透射式原位测量和大块样品上的反射式原位测量所获得的数据将允许对L-PBF工艺中使用的有限元模型进行验证和验证。由爱思唯尔有限公司出版。这是CC BY-NC-ND许可证(http://creativecommons.org/licenses/by-nc-nd/4.0/).下的一篇开放获取文章
During laser-powder bed fusion (L-PBF) the printed material is subjected to multiple fast heating and cooling cycles when the laser interacts with neighboring tracks or layers above. The complex thermal his-tory influences the final microstructure and the macroscopic properties of the printed part. In this work, we demonstrate how high-speed in situ X-ray diffraction in transmission mode can be used to measure temperature profiles and cooling rates in a Ti-6Al-4V single-track wall. During the laser remelting of the top layer, a temperature exceeding the E. transus temperature (TE. ti 1252 K) is measured up to 150 gm below the surface. The maximum observed cooling rates vary from 106 K/s at the top surface, to 105 K/s at a depth of 135 gm and 104 K/s at a depth of 255 gm. Based on the temporal evolution of the various crys-tallographic phases, the dimensions of the melt pool and the high-temperature E. zone surrounding the melt pool are estimated. It is anticipated that the data obtained from in situ measurements in transmis-sion mode on a thin wall combined with in situ measurements in reflection mode on a bulk sample will allow verification and validation of finite element models used in L-PBF processing.(c) 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).