Failure Analysis of 20Cr32NiNb Steel Hot Outlet Manifold
摘 要
某厂CO转化炉热壁集气管在服役2 a后发生早期开裂,通过断口宏观观察、扫描电镜观察、化学成分分析、力学性能测试等对开裂集气管进行了失效分析。结果表明:集气管的失效形式为蠕变开裂;由于集气管长期在高温下服役,大量蠕变孔洞在晶界处萌生,并在高温和应力作用下不断长大,相邻蠕变孔洞间相互连接或融合,形成裂纹,在应力作用下,裂纹沿晶界不断扩展并最终导致集气管的开裂。
Abstract
The hot outlet manifold of CO reformer used in a factory cracked prematurely after its service for 2 a. The failure analysis of the cracked outlet manifold was performed by macroscopic observation of the fracture, scanning electron microscope observation, chemical composition analysis and mechanical property tests. The results show that the failure type of the outlet manifold was creep cracking. Because the outlet manifold served at high temperature for a long time, creep cavities generated along grain boundaries and grew gradually at high temperature and stress. The adjacent cavities connected or merged together to form cracks. Cracks propagated gradually and finally the outlet manifold cracked under the stress.
中图分类号 TG115.9 DOI 10.11973/jxgccl201711020
所属栏目 失效分析
基金项目
收稿日期 2016/7/30
修改稿日期 2017/8/8
网络出版日期
作者单位点击查看
备注倪莹莹(1991-),女,江苏淮安人,硕士研究生
引用该论文: NI Yingying,TANG Jianqun,GUO Xiaofeng,GONG Jianming. Failure Analysis of 20Cr32NiNb Steel Hot Outlet Manifold[J]. Materials for mechancial engineering, 2017, 41(11): 102~105
倪莹莹,唐建群,郭晓峰,巩建鸣. 20Cr32NiNb钢热壁集气管的失效分析[J]. 机械工程材料, 2017, 41(11): 102~105
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参考文献
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【3】AHMAD J, PURBOLAKSONO J, BENG L C.Failure analysis on high temperature superheater Inconel 800 tube[J].Engineering Failure Analysis, 2010, 17(1): 328-333.
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【5】DINI G, VAGHEFI S M M, LOTFIANI M, et al. Computational and experimental failure analysis of continuous-annealing furnace radiant tubes exposed to excessive temperature[J]. Engineering Failure Analysis, 2008, 15(5): 445-457.
【6】HOFFMAN J J, MAGNAN J. Cast 20Cr32Ni1Nb alloy aged mechanical property improvements via chemistry modifications[C]//2003 Annual Conference and Exhibition. Houston: NACE, 2003:3469.
【7】KNOWLES D M, THOMAS C W, KEEN D J, et al. In service embrittlement of cast 20Cr32Ni1Nb components used in steam reformer applications[J]. International Journal of Pressure Vessels and Piping, 2004, 81(6): 499-506.
【8】谢君,田素贵,周晓明,等.FGH95粉末镍基合金的组织结构与蠕变断裂特征[J]. 材料工程, 2009(增2): 147-151.
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