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| 1 | Solidified structure of thin-walled titanium parts by vertical centrifugal casting显示文摘The solidified structure of the thin-walled and complicated Ti-6Al-4V castings produced by the vertical centrifugal casting process was studied in the present work.The results show that the wall thickness of the section is featured with homogeneously distributed fine equiaxial grains,compared with the microstructure of the thick-walled section.The grain size of the castings has a tendency to decrease gradually with the increasing of the centrifugal radius.The inter-lamellar space in thick-walled casting parts is bigger than that of the thin-walled parts,and the profile of inter-lamellar space is not susceptible to the centrifugal radius. | Wu Shiping Xu Qin Zhang Jun Nan Hai Xue Xiang Guo Jingjie | 2011 | China Foundry2011，8，2： | 4 |
| 2 | 微尺度空间内离心铸造过程的流动方程及相似准则(英文)显示文摘通过相似物理模拟方法研究离心力场下液态金属在微尺度空间内的流动过程,相似准则的推导是工作的重点。在传统流动方程的基础上,充分考虑微精密铸造过程中特殊的物理条件,推导了离心铸造过程液态金属在微尺度空间内充型流动时满足的流动方程和伯努利方程,为微尺度空间内液态金属的充型流动过程数值模拟提供了数学模型。同时,依据微流动方程和相似理论,获得了离心力场下物理模拟微尺度空间内液态金属流动过程的相似准则,从而实现微流动过程的可视化观察和定量分析。 | 任明星 王国田 李邦盛 王振龙 傅恒志 | 2014 | Transactions of Nonferrous Metals Society of China2014，24，5： | 2 |
| 3 | Microstructure and mechanical properties of TiAl castings produced by zirconia ceramic mould显示文摘Owing to their low density and attractive high-temperature properties, gamma titanium aluminide alloys (TiAl alloys, hereafter) have significant potential application in the aerospace and automobile industries, in which these materials may replace the heavier nickel-based superalloys at service temperatures of 600-900℃. Investment casting of TiAl alloys has become the most promising cost-effective technique for the manufacturing of TiAl components. Ceramic moulds are fundamental to fabricating the TiAl casting components. In the present work, ceramic mould with a zirconia primary coat was designed and fabricated successfully. Investment casting of TiAl blades and tensile test of specimens was carried out to verify the correctness and feasibility of the proposed method. The tensile test results indicate that, at room temperature, the tensile strength and the elongation are about 450 MPa and 0.8%, respectively. At 700℃, the tensile strength decreases to about 410 MPa and the elongation increases to 2.7%. Microstructure and mechanical properties of investment cast TiAl alloy are discussed. | Chen Yanfei Xiao Shulong Tian Jing Xu Lijuan Chen Yuyong | 2011 | China Foundry2011，8，4： | 1 |
| 4 | Melt flow,solidification structures,and defects in 316 L steel strips produced by vertical centrifugal casting显示文摘Vertical centrifugal casting can significantly enhance the filling capability of molten metals,enabling the production of complex thin-walled castings at near-rapid cooling rates.In this study,the melt flow,solidification structures,and defects in 316 L steel cast strips with a geometry of 80 mm×60 mm×2.5 mm produced by vertical centrifugal casting were numerically and experimentally analyzed under different rotation speeds.With gradually increasing the rotation speed from 150 r/min to 900 r/min,the simulated results showed the shortest filling time and minimum porosity volume in the cast strip at a rotation speed of 600 r/min.Since a strong turbulent flow was generated by the rotation of the mold cavity during the filling process,experimental results showed that a“non-dendritic”structure was obtained in 316 L cast strip when centrifugal force was involved,whereas the typical dendritic structure was observed in the reference sample without rotation.Most areas of the cast strip exhibited one-dimensional cooling,but three-sided cooling appeared near the side of the cast strip.Moreover,the pores and cracks in the 316 L strips were detected by computed tomography scanning and analyzed with the corresponding numerical simulations.Results indicated the existence of an optimal rotational speed for producing cast strips with minimal casting defects.This study provides a better understanding of the filling and solidification processes of strips produced by vertical centrifugal casting. | Li-Bing Liu Cong-Hui Hu Yun-Hu Zhang Chang-Jiang Song Qi-Jie Zhai | 2023 | Advances in Manufacturing2023，11，4： | 0 |
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