瞬态形核工艺制备A356合金半固态浆料的研究
发布时间:2018-04-03 09:28
本文选题:A合金 切入点:半固态浆料 出处:《热加工工艺》2017年21期
【摘要】:采用基于瞬态形核工艺的半固态合金浆料生产装置来制备A356合金半固态浆料,研究熔体温度、制浆通道倾角对浆料组织的影响,探讨瞬态形核工艺中半固态浆料球状初生相的制备机理。结果表明:熔体温度700℃,制浆通道倾角20°以及熔体温度680℃,制浆通道倾角30°~40°条件下,均制备出具有典型半固态形貌的A356合金半固态浆料。熔体温度确定时,在一定范围的制浆通道倾角条件下才能制备出合格的半固态浆料。采用瞬态形核工艺制备合金半固态浆料的晶核来源主要有四方面:一是受制浆通道内壁激冷而瞬时形核;二是附着在制浆通道内壁上的晶核,在熔体流动冲刷作用下进入熔体内部形成游离晶核;三是受激冷形核棒激冷大量形成晶核;四是由于激冷形核棒自身的熔蚀产生大量晶核。
[Abstract]:A semi-solid alloy slurry production device based on transient nucleation process was used to prepare semi-solid slurry of A356 alloy. The effects of melt temperature and channel inclination angle on the microstructure of A356 alloy slurry were studied.The preparation mechanism of semisolid slurry spherical primary phase in transient nucleation process was discussed.The results show that A356 alloy semi-solid slurry with typical semi-solid morphology is prepared under the conditions of melt temperature 700 鈩,
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