基于熔体凝固过程电阻率监测的亚共晶Al-Si合金变质效果快速评价实验研究

IF 0.7 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Kovove Materialy-Metallic Materials Pub Date : 2022-06-17 DOI:10.31577/km.2022.3.139

Ao Wang, Jianming Dong, Dayong Li

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引用次数: 0

摘要

为了提高炉前改性效果快速评价的准确性，对铝硅合金熔体凝固过程中电阻率变化与改性程度的关系进行了实验研究。针对实际应用，设计了一套熔体电阻率监测系统，包括样品杯、样品杯底座支撑、真空抽吸装置、恒流电源、数据采集模块和计算机。利用该监测系统对添加不同量Sr改性剂的ZL101A合金熔体凝固过程中温度和电阻率参数的变化进行了监测。发现共晶凝固阶段熔体电阻率随温度变化曲线有一个平台，随着合金变质效果的提高，其电阻率平台值减小。为此，建立了基于熔体凝固过程中电阻率变化的炉前亚共晶Al-Si合金变质效果快速评价模型。实验结果表明，利用本文设计的监测系统和评价模型，可以在3分钟内完成对亚共晶Al-Si合金变质效果的评价。以金相观察法为标准，修正等级误差在±0.5以内的评价精度达到80%。

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Experimental study on rapid evaluation of modification effect of hypoeutectic Al-Si alloy based on melt solidification process resistivity monitoring

In order to improve the accuracy of rapid evaluation of the modiﬁcation eﬀect of Al-Si alloy in front of the furnace, the relationship between resistivity change and modiﬁcation level during melt solidiﬁcation was experimentally studied. A melt resistivity monitoring system was designed for practical application, including a sample cup, sample cup base support, vacuum aspiration unit, constant current power supply, data acquisition module, and computer. The monitoring system was used to monitor the changes in temperature and resistivity parameters during solidiﬁcation of ZL101A alloy melt treated with diﬀerent amounts of Sr modiﬁer. It was found that the curve of melt resistivity changes with temperature at the eutectic solidiﬁcation stage had a plateau, and the resistivity plateau value decreased with the better alloy modiﬁcation eﬀect. Therefore, a rapid evaluation model was established of the hypoeutectic Al-Si alloy modiﬁcation eﬀect in front of the furnace based on resistivity change during melt solidiﬁcation. The experimental results showed that the evaluation of the modiﬁcation eﬀect of the hypoeutectic Al-Si alloy could be completed within 3 minutes by using the monitoring system and evaluation model designed in this paper. The accuracy of the evaluation of modiﬁcation level error within ± 0.5 reaches 80 % taking the metallographic observation method as the standard.

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来源期刊

Kovove Materialy-Metallic Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

3 months

期刊介绍： Kovove Materialy - Metallic Materials is dedicated to publishing original theoretical and experimental papers concerned with structural, nanostructured, and functional metallic and selected non-metallic materials. Emphasis is placed on those aspects of the science of materials that address: the relationship between the microstructure of materials and their properties, including mechanical, electrical, magnetic and chemical properties; the relationship between the microstructure of materials and the thermodynamics, kinetics and mechanisms of processes; the synthesis and processing of materials, with emphasis on microstructural mechanisms and control; advances in the characterization of the microstructure and properties of materials with experiments and models which help in understanding the properties of materials.