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首页> 外文期刊>Journal of Materials Engineering and Performance >Impact Behavior of A356 Foundry Alloys in the Presence of Trace Elements Ni and V
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Impact Behavior of A356 Foundry Alloys in the Presence of Trace Elements Ni and V

机译：微量元素Ni和V存在下A356铸造合金的冲击行为

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摘要

In the present work, the impact behavior of unmodified A356 alloys with the addition of Ni or V in as-cast and T6 heat-treated conditions was assessed. Charpy V-notched specimens obtained from sand and permanent mold casting showed low total absorbed energy average values (W (t) < 2 J). SEM analysis of fracture profiles and surfaces indicated a Si-driven crack propagation with a predominant transgranular fracture mode. Occasionally, intergranular contributions to fracture were detected in the permanent mold cast alloys due to the locally finer microstructure. Concurrent mechanisms related to the chemical composition, solidification conditions and heat treatment were found to control the impact properties of the alloys. While the trace element Ni exerted only minor effects on the impact toughness of the A356 alloy, V had a strong influence: (i) V-containing sand cast alloys absorbed slightly higher impact energies compared to the corresponding A356 base alloys; (ii) in the permanent mold cast alloys, V in solid solution led to a considerable loss of ductility, which in turn decreased the total absorbed energy.
机译：在目前的工作中，评估了在铸态和T6热处理条件下添加Ni或V的未改性A356合金的冲击行为。从沙子和永久铸模获得的夏比V型缺口试样显示出较低的总吸收能量平均值（W（t）<2 J​​）。断裂轮廓和表面的SEM分析表明，硅驱动的裂纹扩展具有主要的跨晶断裂模式。有时，由于局部较细的显微组织，在永久铸模合金中检测到晶间的断裂作用。发现与化学成分，凝固条件和热处理有关的并发机理可以控制合金的冲击性能。微量元素Ni对A356合金的冲击韧性影响不大，而V具有很强的影响力：（i）含V的砂铸合金吸收的冲击能比相应的A356基础合金略高; （ii）在永久铸模合金中，固溶态的V导致延展性大大降低，进而降低了总吸收能。

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