1. 毕业设计（论文）的内容和要求
针对25Cr35Ni1Nb炉管在服役过程中可能发生的局部更换修复问题，本研究通过金相光学显微镜对新旧炉管焊接接头母材、焊缝以及热影响区的形貌进行观察，采用SEM和EDS观察析出相的形貌并确定碳化物的类型，通过高温拉伸、常温拉伸以及蠕变实验对接头的力学性能进行分析。
最终通过对新旧炉管焊接接头微观组织和力学性能的分析，评估新旧焊接接头的可焊性。
要求学生主要完成以下工作：①阅读文献30篇以上，其中英文8篇以上；②英文翻译（3000字以上）：1篇；③开题报告：1份；④实习报告：1份；⑤毕业论文：1篇；⑥图纸要求：CAD图纸不少于3张A1。
2. 参考文献
[1] A. Energy, Materials, fabrication. and repair considerations for hydrogen reformer furnace outlet pigtails and manifolds, Technical Report, API, 2011.[2] Yan J, Gu Y, Dang 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.[3] Spyrou L A, Sarafoglou P I, Aravas N, et al. Evaluation of creep damage of INCOLOY 800HT pigtails in a refinery steam reformer unit[J]. Engineering Failure Analysis, 2014, 45: 456-469.[4] Da Silveira T L, Le May I. Reformer Furnaces: materials, damage mechanisms, and assessment[J]. Arabian Journal for Science and Engineering, 2006, 31(2): 99-119.[5] 廖景娱, 刘正义. 金属构件失效分析[M]. 北京: 化学工业出版社, 2003.[6] 迟成宇, 于鸿基, 谢锡善. 600 ℃超超临界电站锅炉过热器及再热器管道用先进奥氏体耐热钢的硏究与发展[J]. 世界钢铁, 2012, 12(4): 50-65.[7] Javaheri V, Shahri F, Mohammadnezhad M, et al. The Effect of Nb and Ti on Structure and Mechanical Properties of 12Ni-25Cr-0.4C Austenitic Heat-Resistant Steel after Aging at 900 C for 1000 h[J]. Journal of materials engineering and performance, 2014, 23(10): 3558-3566.[8] Yoshikawa K, Teranishi H, Tokimasa K, et al. Fabrication and properties of corrosion resistant TP347H stainless steel[J]. Journal of materials engineering, 1988, 10(1): 69-83.[9] Sourmail T. Precipitation in creep resistant austenitic stainless steels[J]. Materials science and technology, 2001, 17(1): 1-14.[10] Yokoyama T, Masuyama F. Application of boiler materials for ultra-high temperature and high pressure power plants[J]. The Thermal and Nuclear Power, 1994, 45(11): 43-54.[11] Sawaragi Y, Ogawa K, Kato S, et al. Development of the economical 18-8 stainless steel(super304 H)having high elevated temperature strength for fossil fired boilers[J]. Sumitomo Search (Japan), 1992 (48): 50-58.[12] E. Pippel, J Woltersdorf R Schneider, Micromechanisms of metal dusting on Febase and Ni-base alloys, Materials and Corrosion, 1998, 49(5): 309-316.[13] Wen-Tai H, Honeycombe R W K. Structure of centrifugally cast austenitic stainless steels: Part 2 Effects of Nb, Ti, and Zr[J]. Materials science and technology, 1985, 1(5): 390-397.[14] Shinoda T. The Effect of Single and Combined Additions of Ti and Nb on the Structure and Strength of Centrigugally Cast HK40 Steel[J]. Trans. ISIJ, 1978, 18: 139-148.[15] Sorell G. Corrosion-and Heat-Resistant Nickel Alloys, Guidelines for Selection and Application[J]. Nickel Development Institute, Technical Report, 1998.[16] Ribeiro E A A G, Papaleo R, Guimares J R C. Microstructure and creep behavior of a niobium alloyed cast heat-resistant 26 pct Cr steel[J]. Metallurgical and Materials Transactions A, 1986, 17(4): 691-696.
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