作者: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
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Authors:WANG Hong-xin,XU Zhen-yu,ZHANG Li,LIU Hao-xi,LUO He,HAN Zhi-wei,LI Jia-rui,LI Yun-long,AI Shi-min
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摘要:摘要: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。
Abstract:Abstract:The thermal analysis of relative thermal conductivity is a novel method to detect the spheroidizing effect of ductile iron before furnace. In this paper, the solidification characteristics of thermal analysis samples with relative thermal conductivity are studied by using Pro-CAST simulation software and testing cooling curve. The results show that in the process of stable solidification and testing, the geometric center of the upper end of the sample is the only heat source, and the thermocouple at the lower end receives the natural cooling heat and phase transformation latent heat transmitted by the heat source center at the upper end, so the relative thermal conductivity information is superimposed on the solid phase equilibrium cooling curve. Thus, the solidification characteristics of the central molten iron at the upper end of the test sample and the morphological characteristics of graphite in the solidification structure of the heat conduction path can be indicated. The geometric thermal center at the upper end of the sample is easy to form shrinkage solidification structure defects, which is related to the metallurgical state of molten iron, solidification mode and sample cup size structure and so on. Reasonable use of the effective test parameters at the upper and lower ends of the thermal analysis sample cup of relative thermal conductivity can provide richer metallurgical quality information for the test of molten iron.

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