本研究主要針對矽鋼胚在軋延前的再加熱製程進行破壞機制的探討，以及材料特性與熱傳參數的研究分析。預測及判斷鋼胚在加熱爐中升溫溫度變化時，加熱速度影響鋼胚內外溫度差以及材料特性的變化所引起的破壞機制，避免鋼胚破裂的發生造成嚴重的產能損失；本研究以有限元素法軟體模擬分析建置矽鋼胚發生破壞與否的理論預測模型，並在未來進行實驗驗證。本研究的破壞預測擬藉由應變能密度預測鋼胚破壞時累積的韌性強度，以建立理論數值分析模型。利用有限元素法分析鋼胚受到溫度與時間變化下的應變能密度特性，由鋼胚受到溫度梯度分佈時發生斷裂的臨界應變能密度建立其理論模型，利用矽鋼加熱時的溫度曲線進行溫度與時間的變化對鋼胚發生熱裂破壞的預估。在鋼胚加熱破壞理論模型研究，針對鋼胚的升溫由分析中可獲得直接由表面經熱傳導至內部的溫度梯度而造成溫度變化的破壞機制，並可詳細的在未來以實驗方式驗證理論模型，透過本研究得到鋼胚的最適溫控模式。經由本研究，除了可獲知是否可藉由縮短矽鋼的加熱時間以提升產能、降低能源成本之外，亦適用其他鋼胚鋼種之理論模型，對於各式鋼材的生產製造可得到豐富且有效的資訊。然而，本研究之鋼胚破壞機制的預測模型乃是針對理想之鋼胚表面溫度進行最適溫控技術的假設之下所建立，但實際的加熱爐設備是否可達目標溫度則受到許多熱傳參數的影響，若可使升溫策略達到最適溫控模式，將可提高矽鋼片之產量，以及實現節能減廢的要求。

Heating processes are commonly operated during manufacturing ultra-thin electromagnetic steel sheet. To increase the production of ultra-thin electromagnetic steel sheet, the heating rates need to increase. However, the improper increases in heating rates may induce fracture on ultra-thin electromagnetic steel sheet. Therefore, the proper heating rates are the important factors of manufacturing ultra-thin electromagnetic steel sheet. The effects of heating processes on the fracture mechanism of ultra-thin electromagnetic steel sheet will be numerically studied in this research. The strain energy density criterion will be used to predict the fracture mechanism in the study. To predict fracture of ultra-thin electromagnetic steel in heating , the critical strain energy density is applied to determine the optimal heating rates. According to the investigation of the optimal heating rates from numerical study, an experimental setup will be designed and developed by means of the similarity theory. Hence, a heating furnace system will be built to simulate the heat process of ultra-thin electromagnetic steel sheet. The effect of various heating rates on the fracture of ultra-thin electromagnetic steel sheet will be verified by experimental method. Through this research, in addition to be informed whether ultra-thin electromagnetic steel sheet by shortening the heating time to improve productivity, reduce energy costs, the theoretical model also applies to other kinds of steel for manufacturing various types of steel available and effective information. However, this study forecasting model destruction mechanism but ideal for ultra-thin electromagnetic steel sheet surface temperature under the assumption that the establishment of optimum temperature control technology, but the furnace device which is reachable target temperature is subject to a number of heat transfer parameters impact. Therefore, the reliable heating processes of the heating furnaces will improve the production of electromagnetic steel sheet and achieve energy saving requirements.

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