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首页> 外文期刊>International Journal Cast Metals Research >Analysis of the impact of macrosegregation on hot tearing conditions during DC casting of aluminium alloys
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Analysis of the impact of macrosegregation on hot tearing conditions during DC casting of aluminium alloys

机译：铝合金直流铸造过程中宏观偏析对热撕裂条件的影响分析

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摘要

It is well known that the chemical composition has a strong impact on the hot tearing susceptibility of aluminium alloys. Macrosegregation formation during DC casting of aluminium may lead to large variations of the alloy composition. Assessments of the cracking susceptibility during DC-casting do not take into account composition variations within the ingot. A two-phase model where the main phenomena associated with the formation of hot tears are accounted for, i.e., the lack of feeding at the late stages of solidification and the localization of viscoplastic deformation, has recently been proposed by the authors. In the present study, the two-phase model is extended to allow for the computation of macrosegregation and its interaction with hot tearing formation. The impact of macrosegregation on mechanical fields often associated with the cracking tendency is assessed through case studies where both macrosegregation and the mechanical analysis are computed simultaneously. The case studies are carried out for the start-up of the DC casting process.
机译：众所周知，化学成分对铝合金的热撕裂敏感性有很大的影响。在铝的直流铸造过程中形成宏观偏析会导致合金成分发生较大变化。在直流铸造过程中对裂纹敏感性的评估未考虑铸锭内的成分变化。作者最近提出了一种两相模型，其中考虑了与热撕裂形成有关的主要现象，即，在凝固的后期缺乏进料和粘塑性变形的局部化。在本研究中，扩展了两相模型以允许宏观偏析及其与热撕裂地层相互作用的计算。通过案例研究评估了宏观偏析对通常与开裂趋势相关的机械场的影响，在案例研究中同时计算了宏观偏析和力学分析。为启动DC铸造过程进行了案例研究。

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