本文選題：氣—固反應 + 脫碳�。� 參考：《華北理工大學》2016年碩士論文

【摘要】：本研究在Ar-H_2-H_2O弱氧化氣氛條件下,以高碳鐵碳合金薄帶的脫碳反應作為研究對象,進行氣—固脫碳反應動力學研究,重點研究內(nèi)容包括脫碳速率的影響因素、薄帶內(nèi)部碳濃度的分布、脫碳反應限制性環(huán)節(jié)等動力學分析。提出了改善脫碳動力學條件、提高脫碳效果的方法。實驗以初始碳含量、厚度、脫碳溫度、時間和氣氛條件為變量,以單因素法對脫碳反應進行研究。脫碳反應采用初始碳含量分別為4.2%和3.2%鐵碳合金薄帶為實驗原料,薄帶厚度分別為0.6mm、1.0mm、1.5mm和2mm,脫碳溫度為1293~1413K,脫碳時間為10~80min。研究結(jié)果表明鐵碳合金薄帶氣—固脫碳反應為表觀一級反應,脫碳反應活化能144.9KJ/mol,與奧氏體相區(qū)碳的擴散活化能理論值Q=140KJ/mol基本相同。實驗結(jié)果證明碳從薄帶內(nèi)部向反應界面的擴散是限制性環(huán)節(jié)。根據(jù)升高溫度提高脫碳速率的結(jié)論提出了分段加熱脫碳法,采用分段加熱法初始碳含量為4.15%的2mm鐵碳合金薄帶的碳含量在70min內(nèi)可以由原恒溫法的0.98脫除到0.28%。實驗通過單因素法分析影響脫碳速率的因素,得出了碳含量定量關(guān)系的函數(shù)表達式。在不同的實驗條件下,脫石墨層深度均與時間的二分之一次方呈良好的線性關(guān)系,y=Ct~(1/2)。薄帶厚度越厚,溫度越高,脫石墨層向中心推移地越快。通過計算得到1293K溫度下表觀擴散系數(shù)D=3.4~3.5×10~(-7)cm~2/s,與擴散系數(shù)經(jīng)驗值基本一致,由此可以證明在整個脫碳過程中脫碳反應的限制性環(huán)節(jié)是碳在奧氏體相區(qū)的擴散。
[Abstract]:In this study, the kinetics of gas-solid decarburization reaction was studied under the condition of Ar-H2-H2O weak oxidation atmosphere and the decarburization reaction of high-carbon Fe-C alloy strip was studied. The main contents of the study included the factors affecting the decarburization rate. The distribution of carbon concentration in the thin strip and the limiting link of decarbonization reaction were analyzed. The methods to improve the kinetics of decarbonization and to improve the decarbonization effect are put forward. The initial carbon content, thickness, decarburization temperature, time and atmosphere conditions were taken as variables in the experiment, and the decarburization reaction was studied by single factor method. The initial carbon content of 4. 2% and 3. 2% Fe-C alloy ribbons were used as raw materials for the decarburization reaction. The thickness of the ribbons was 0.6 mm ~ 1.0mm ~ (-1) mm ~ (1.5) mm and 2 mm respectively. The decarburization temperature was 1293 ~ (-1) K and the decarburization time was 10 ~ 80 min. The results show that the gas-solid decarbonization reaction of Fe-C alloy is an apparent first-order reaction, and the activation energy of the decarbonization reaction is 144.9 KJ / mol, which is basically the same as the theoretical value of diffusion activation energy Q _ (140) KJ / mol in the austenitic phase region. The experimental results show that the diffusion of carbon from the inner band to the reaction interface is a restrictive link. According to the conclusion of increasing the decarburization rate by increasing the temperature, a new method of decarburization by subsection heating is proposed. The carbon content of 2mm ferrocarbon alloy strip with 4.15% initial carbon content can be removed from 0.98 to 0.28 in 70min. The factors influencing decarbonization rate were analyzed by single factor method, and the functional expression of quantitative relationship of carbon content was obtained. Under different experimental conditions, there is a good linear relationship between the depth of the delaminated layer and the 1/2 power of time. The thicker the strip thickness and the higher the temperature, the faster the degraphite layer moves toward the center. At 1293K, the apparent diffusion coefficient D3. 4 ~ 3. 5 脳 10 ~ 10 ~ (-7) cm ~ (-1) / s is in good agreement with the empirical value of the diffusion coefficient. It is proved that the limiting part of the decarbonization reaction is the diffusion of carbon in the austenitic phase region during the whole decarbonization process.
【學位授予單位】：華北理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TG141

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