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| 1 | Effect of FeSi additive in dual-chamber sample cup on thermal analysis characteristic values and vermiculating rate of compacted graphite iron显示文摘Thermal analysis plays a key role in the online inspection of molten iron quality.Different solidification process of molten iron can be reflected by thermal analysis curves,and silicon is one of important elements affecting the solidification of molten iron.In this study,FeSi75 was added in one chamber of the dual-chamber sample cup,and the influences of FeSi75 additive on the characteristic values of thermal analysis curves and vermiculating rate were investigated.The results show that with the increase of FeSi75,the start temperature of austenite formation TALfirstly decreases and then increases,but the start temperature of eutectic growth TSEF,the lowest eutectic temperature TEU,temperature at maximum eutectic reaction rate TEM,and highest eutectic temperature TERkeep always an increase.The temperature at final solidification point TEShas little change.The FeSi75 additive has different influences on the vermiculating rate of molten iron with different vermiculation,and the vermiculating rate increases for lower vermiculation molten iron while decreases for higher one.According to the thermal analysis curves obtained by a dual-chamber sample cup with 0.30wt.%FeSi75 additive in one chamber,the vermiculating rate of molten iron can be evaluated by comparing the characteristic values of these curves.The time differenceΔtERcorresponding to the highest eutectic temperature TERhas a closer relationship with the vermiculating rate,and a parabolic regression curve between the time differenceΔtERand vermiculating rateηhas been obtained within the range of 65%to 95%,which is suitable for the qualified melt. | De-quan Shi Ze-yu Liu Gui-li Gao Yi-cheng Feng | 2024 | China Foundry2024，21，1： | 0 |
| 2 | 球墨铸铁相对导热热分析试样凝固特性研究显示文摘相对导热率热分析,是一种新颖的球墨铸铁球化效果炉前检测方法。利用Pro-Cast模拟仿真软件和测试冷却曲线研究了相对导热率热分析试样的凝固特性。结果表明,在稳定凝固测试过程中,试样上端部的几何中心是唯一热源,下端部热电偶接收由上端部热源中心传递的自然冷却热和相变潜热,从而在固相平衡降温曲线上叠加得到相对导热性信息,以显示测试试样上端部中心铁液的凝固特性及热传导路径的凝固组织中石墨的形态特性。试样上端部几何热中心易形成收缩凝固组织缺陷,与铁液冶金状态、凝固模式和样杯尺寸结构等有关。合理利用相对导热率热分析样杯上端部和下端部的有效测试参量可为测试铁液提供更丰富的冶金质量信息。 | 王宏鑫 徐振宇 张丽 刘浩熹 罗赫 韩志伟 李佳芮 李云龙 艾士民 | 2022 | 哈尔滨理工大学学报2022，27，6： | 0 |
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