1. 毕业设计（论文）的内容和要求
乙烯裂解炉是乙烯生产的核心设备，裂解炉管的使用和损伤情况直接影响整个裂解装置的运行。
由于炉管长期处于高碳势、低氧压的高温裂解介质服役环境中，内壁面存在结焦导致渗碳损伤的问题。
本课题基于合金热力学扩散相关理论，从理论上对碳元素在合金中的扩散进行讨论，以数值模拟的形式获得碳元素分布。
2. 参考文献
[1] 涂善东, 轩福贞, 王卫泽. 高温蠕变与断裂评价的若干关键问题[J]. 金属学报, 2009, 45(7): 781-787.[2] 涂善东. 安全4.0:过程工业装置安全技术展望[J]. 化工进展, 2016, 35(6): 1646-1651.[3] Yan J B, Gu Y F, Dang Y Y, et al. Effect of carbon on the microstructure evolution and mechanical properties of low Si-containing centrifugal casting 20Cr32Ni1Nb alloy[J]. Materials Chemistry and Physics, 2016, 175: 107-117.[4] Spyrou L A, Sarafoglou P I, Aravas N, et al. Evaluation of creep damage of INCOLOY 800HT pigtails in a renery steam reformer unit[J]. Engineering Failure Analysis, 2014, 45: 456-469.[5] 安俊超. 多因素下乙烯裂解炉管焊接接头寿命预测研究[D]. 天津: 天津大学，2011.[6] API 942, Materials, fabrication, and repair considerations for hydrogen reformer furnace outlet pigtails and manifolds[S], 2011.[7] Liu C J, Chen Y. Variations of the microstructure and mechanical properties of HP40Nb hydrogen reformer tube with time at elevated temperature[J]. Materials and Design, 2011, 32: 2507-2512.[8] Kaya A A. Microstructure of HK40 alloy after high-temperature service in oxidizing/carburizing environment II. Carburization and carbide transformations[J]. Materials Characterization, 2002, 49: 23-34.[9] Ray A K, Sinha S K, Tiwari Y N, et al. Analysis of failed reformer tubes[J]. Engineering Failure Analysis, 2003, 10: 351-362.[10] Lee J H, Yang W J, Yoo W D, et al. Microstructural and mechanical property changes in HK40 reformer tubes after long term use[J]. Engineering Failure Analysis, 2009, 16: 1883-1888.[11] Laigo J, Christien F, Gall R L, et al. SEM, EDS, EPMA-WDS and EBSD characterization of carbides in HP type heat resistant alloys[J]. Materials Characterization, 2008, 59: 1580-1586.[12] Alvino A, Ramires D, Tonti A, et al. Influence of chemical composition on microstructure and phase evolution of two HP heat resistant stainless steels after long term plant-service aging[J]. Materials at High Temperatures, 2014, 31(1): 2-11.
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