Yang Qingfeng, Xia Cunjuan, Wang Haowei, Zhou Mingyang, Gao Shixin, Li Bingjin, Liu Shichao
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610213, China.
The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China.
Materials (Basel). 2022 Mar 25;15(7):2440. doi: 10.3390/ma15072440.
Wire and arc additive manufacturing based on cold metal transfer (WAAM-CMT), as a kind of clean and advanced technology, has been widely researched recently. It was analyzed in detail for the microstructure and mechanical properties of WAAM-CMT printed TiB/AlSi7Mg0.6 samples fore-and-aft heat treatment in this study. Compared with the grain size of casted AlSi7Mg0.6 samples (252 μm), the grain size of WAAM-CMT printed AlSi7Mg0.6 samples (53.4 μm) was refined, showing that WAAM-CMT process could result in significant grain refinement. Besides, the grain size of WAAM-CMT printed TiB/AlSi7Mg0.6 samples was about 35 μm, revealing that the addition of TiB particles played a role in grain refinement. Nevertheless, the grain size distribution was not uniform, showing a mixture of fine grain and coarse grain, and the mechanical properties were anisotropic of the as-printed samples. This study shows that T6 heat treatment is an efficient way to improve the nonuniform microstructure and eliminate the anisotropy in mechanical properties.
基于冷金属过渡的电弧增材制造（WAAM-CMT）作为一种清洁且先进的技术，近年来受到了广泛研究。本研究详细分析了WAAM-CMT打印的TiB/AlSi7Mg0.6样品在热处理前后的微观结构和力学性能。与铸造AlSi7Mg0.6样品的晶粒尺寸（252μm）相比，WAAM-CMT打印的AlSi7Mg0.6样品的晶粒尺寸（53.4μm）得到了细化，表明WAAM-CMT工艺可导致显著的晶粒细化。此外，WAAM-CMT打印的TiB/AlSi7Mg0.6样品的晶粒尺寸约为35μm，这表明添加TiB颗粒起到了晶粒细化的作用。然而，晶粒尺寸分布不均匀，呈现出细晶粒和粗晶粒的混合，并且打印态样品的力学性能具有各向异性。本研究表明，T6热处理是改善微观结构不均匀性和消除力学性能各向异性的有效方法。
