Modelling surface thermal damage to hot mill rolls
Modelling surface thermal damage to hot mill rolls
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DOI：
10.1016/j.wear.2006.12.062
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发表时间：
2007-09-10
期刊：
影响因子：
5
通讯作者：
Hernandez-Rodriguez, M. A. L.
中科院分区：
文献类型：
--
作者：
Mercado-Solis, R. D.;Talamantes-Silva, J.;Hernandez-Rodriguez, M. A. L.
采用双盘高温实验室试验装置，在与某热轧厂早期机架相对应的条件下，对热轧工作辊材料的表面热损伤进行了研究。试验了两种典型的轧辊牌号：高速工具钢和高碳高铬钢。将研磨数据按比例缩小以适应测试样品尺寸，并用于计算热循环、接触时间和接触压力。建立了基于有限元法的热力耦合模型，预测了轧辊试件芯部和表面的温度分布。该模型的预测显示出良好的协议与使用嵌入式热电偶测量的温度在几个深度在辊测试样品的次表面。高温试验后，将试样切片并通过常规金相学制备用于显微分析。在测试样品中的热引起的表面损伤被发现表现出类似的功能，在实际的轧机工作辊在服务过程中观察到的，特别是高碳高铬钢，它表现出更大程度的表面热损伤比高速工具钢测试样品。根据结果，可以得出结论，新的试验台被证明能够产生热损伤的一致性和可重复性的方式，因此，它可以被视为一个有价值的离线测试资源，以帮助进一步了解工作辊表面劣化现象。(c)2007年由Elsevier B.V.出版。
Sur-face thermal damage to hot mill work roll materials was investigated using twin-disc high-temperature laboratory test rig under conditions that are relevant to those of the early stands of a hot strip rolling mill. Two typical roll grades were tested: high speed tool steel and high-carbon high-chromium steel. Mill data were scaled down to suit the test sample dimensions and used to calculate the thermal cycle, contact times and contact pressure. A coupled thermomechanical model based on the finite element method was developed to predict the temperature distribution within the core and at the surface of the roll test samples. The predictions of the model showed good agreement with the temperatures measured using embedded thermocouples at several depths in the sub-surface of the roll test sample. After high temperature testing, the test samples were sectioned and prepared by conventional metallography for microscopic analysis. The thermally induced surface damage in the test samples were found to exhibit similar features to those observed in actual mill work rolls during service, especially the high-carbon-high-chromium steel, which showed a greater extent of surface thermal damage than the high speed tool steel test samples. Based on the results, it is concluded that the new test rig was proven capable of producing thermal damage in a consistent and reproducible manner and, thus, it can be regarded as a valuable off-line test resource to assist in further understanding the work roll surface deterioration phenomena. (c) 2007 Published by Elsevier B.V.