Damage law of HP-Nb alloy reformer tube in service process
摘 要
对HP-Nb合金转化炉管服役时的显微组织损伤和力学性能衰退规律进行研究。采用光学显微镜、X射线衍射仪分析了不同服役时间下转化炉管显微组织演变和氧化损伤,同时对其常温力学性能、高温蠕变性能、高温抗松弛性能进行了研究。结果表明:长时间的高温服役使HP-Nb合金炉管的一次碳化物粗化,在晶界形成了连续的网状结构;在晶内也析出了大量的二次碳化物,并且随服役时间的延长而长大;初始碳化物由M7C3型碳化物转变为M23C6型碳化物;HP-Nb合金服役过程中发生了内氧化,在炉管内、外表面形成了氧化膜和氧化膜下的贫Cr区;长时间服役后炉管的室温抗拉强度、塑性和韧性、高温蠕变性能、高温抗松弛性能均明显降低。
Abstract
The microstructure damage and mechanical properties degradation of HP-Nb alloy reformer tubes during service were studied. The microstructure evolution and oxidation damage of reformer tubes with different service time were analyzed by optical microscope and X-ray diffractometer. At the same time, its mechanical properties at room temperature, high temperature creep properties and high temperature relaxation resistance were studied. The results show that the primary carbides of HP-Nb alloy furnace tubes were coarsened by long-term high temperature service, and a continuous network structure was formed at the grain boundary. A large number of secondary carbides were also precipitated in the crystal, and grow with the extension of service time. The initial carbide was transformed from M7C3 carbide to M23C6 carbide. Internal oxidation occurred during the service of HP-Nb alloy, and the oxide film and Cr-depleted zone under the oxide film were formed on the inner and outer surfaces of the furnace tube. After long-term service, the room temperature tensile strength, plasticity and toughness, high temperature creep performance and high temperature relaxation resistance of the furnace tube were significantly reduced.
中图分类号 TG142.7 TB31 DOI 10.11973/lhjy-wl202312001
所属栏目 试验与研究
基金项目 江西省教育厅科学技术研究项目(GJJ211606);江西省自然科学基金项目(20232BAB204005)
收稿日期 2023/1/13
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备注陈海见(1977-),男,工程师,主要从事石化高温炉管的检测和失效分析工作
引用该论文: CHEN Haijian,XU Liao,ZHANG Bo,GUO Jingfeng. Damage law of HP-Nb alloy reformer tube in service process[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2023, 59(12): 1~5
陈海见,徐辽,张波,郭景锋. HP-Nb合金转化炉管服役过程中的损伤规律[J]. 理化检验-物理分册, 2023, 59(12): 1~5
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【4】BONACCORSI L, GUGLIELMINO E, PINO R, et al.Damage analysis in Fe-Cr-Ni centrifugally cast alloy tubes for reforming furnaces[J].Engineering Failure Analysis, 2014, 36:65-74.
【5】KONDRAT'EV S, SVIATYSHEVA E V, ANASTASIADI G, et al.Fragmented structure of niobium carbide particles in as-cast modified HP alloys[J].Acta Materialia, 2017, 127:267-276.
【6】GUO J F, ZHANG X M, LI C X, et al.Effects of W and Ce micro addition in filler metal on microstructure and creep strength of Cr35Ni45NbM alloy weld joint[J].Materials Today Communications, 2021, 28:102600.
【7】汤岚清.合成氨转化炉高温炉管失效方式的实验研究[D].北京:北京化工大学, 2012.
【8】郝丽丽, 侯淑娥.HP40裂解炉管组织及裂纹产生原因分析[J].失效分析与预防, 2007, 2(4):45-49.
【9】SHEN L M, LIU H S, GONG J M, et al.Effect of temperature on damage evolution of Cr25Ni35Nb alloy subjected to combined mechanical and environmental degradation[J].High Temperature Materials and Processes, 2015, 34(4):333-340.
【10】ILMAN M N, KUSMONO.Analysis of material degradation and life assessment of 25Cr-38Ni-Mo-Ti wrought alloy steel (HPM) for cracking tubes in an ethylene plant[J].Engineering Failure Analysis, 2014, 42:100-108.
【11】KONDRAT'EV S Y, ANASTASIADI G P, RUDSKOY A I.Nanostructure mechanism of formation of oxide film in heat-resistant Fe-25Cr-35Ni superalloys[J].Metal Science and Heat Treatment, 2015, 56(9):531-536.
【12】秦佳怡, 关凯书.高温炉管服役过程中的显微组织和硬度变化及其损伤评价[J].机械工程材料, 2020, 44(8):17-22.
【13】ZHU Z C, CHENG C Q, LIU C H, et al.Microstructure evolution and nitridation in an As-cast 25Cr-35Ni-1Mo radiant tube after long-term service[J].Metallurgical and Materials Transactions A, 2012, 43(12):4525-4531.
【14】ZHAO Y P, GONG J M, YONG J A, et al.Creep behaviours of Cr25Ni35Nb and Cr35Ni45Nb alloys predicted by modified theta method[J].Materials Science and Engineering:A, 2016, 649:1-8.
【15】MCLEOD A C, BISHOP C M, STEVENS K J, et al.Microstructure and carburization detection in HP alloy pyrolysis tubes[J].Metallography, Microstructure, and Analysis, 2015, 4(4):273-285.
【16】SHI S, LIPPOLD J C.Microstructure evolution during service exposure of two cast, heat-resisting stainless steels-HP-Nb modified and 20-32 Nb[J].Materials Characterization, 2008, 59(8):1029-1040.
【17】VOICU R, ANDRIEU E, POQUILLON D, et al.Microstructure evolution of HP40-Nb alloys during aging under air at 1000℃[J].Materials Characterization, 2009, 60(9):1020-1027.
【18】LIU C J, CHEN X D, CHEN T, et al.Carbide transformation in carburised zone of 25Cr35NiNb+MA alloy after high-temperature service[J].Materials at High Temperatures, 2016, 33(1):98-104.
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