Abstract
This study involves A356 alloy molded through ultrasonically vibrated cooling slope. The slope alongside ultrasonic power enables indispensable shear for engendering slurry from which the semisolid cast/heat treated billets got produced. An examination demonstrates ultrasonically vibrated cooling slope influencing the liquid fraction/microstructure/physical characteristics of stated billets. The investigation encompasses five diverse ultrasonic powers (0, 75, 150, 200, 250 W). The ultrasonic power of 150 W delivers finest/rounded microstructure with enhanced physical characteristics. Microstructural modifications reason physical transformations because of grain refinement and grain-boundary/Hall-Petch strengthening. A smaller grain size reasons a higher strength/shape factor and an increased homogeneity reasons a higher ductility. Microstructural characteristics get improved by reheating. It is owing to coalescence throughout temperature homogenization. The physical characteristics is improved by reheating because of a reduced porosity and enhanced dissolution besides augmented homogeneity. A direct comparison remains impossible owing to unavailability of researches on ultrasonically vibrated cooling slope.
摘要
本文采用超声振动冷却斜槽对A356 合金进行成型. 超声振动冷却斜槽能剪切产生半固态铸造/热处理坯料的浆料, 研究了5 种不同的超声功率(0、75、150、200、250 W)下坯料的液相分数、显微组织、物理特性. 当超声功率为150 W 时, 合金的微观组织更精细、圆整, 物理特性更强. 由于晶粒细化和晶界/Hall-Petch 强化导致微观结构改变, 从而导致物理性能改变. 晶粒尺寸越小, 强度/形状因子越高; 晶粒均匀性越高, 塑性越好. 由于温度均匀化的合并作用, 再加热改善了合金的微观组织; 随着孔隙度的降低和溶解的增强以及均匀性的增强, 在再加热过程中材料的物理性能得到改善.
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Project(SAP-9162) supported by the Ministry of Mines, Technology Information, Forecasting and Assessment Council (TIFAC) and Department of Science and Technology (DST), India
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Nirmal Kumar KUND provided the concept and edited the draft of manuscript. Pabak MOHAPATRA conducted the literature review and wrote the first draft of the manuscript. Both authors replied to reviewers’ comments and revised the final version.
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Pabak MOHAPATRA and Nirmal Kumar KUND declare that they have no conflict of interest.
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Mohapatra, P., Kund, N.K. Impact of ultrasonic power on liquid fraction, microstructure and physical characteristics of A356 alloy molded through cooling slope. J. Cent. South Univ. 29, 1098–1106 (2022). https://doi.org/10.1007/s11771-022-4942-8
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DOI: https://doi.org/10.1007/s11771-022-4942-8