超超临界机组主蒸汽取样管Ⅳ型开裂分析
Analysis on Type Ⅳ Cracking of Main Steam Sampling Tube in USC Unit
摘 要
通过宏观和微观分析、硬度测试和管系应力计算分析了某1 000 MW超超临界机组主蒸汽取样管泄漏的原因。结果表明: 取样管泄漏性质为焊接热影响区Ⅳ型蠕变开裂。其早期失效的主要原因是管系布置的柔性不足导致二次应力过高。提出对T/P91等马氏体钢管道,需重视支吊架的合理设置和维护检修,以防管道发生早期失效。建议对高合金钢焊接接头进行寿命评估时除考虑等效蠕变应力之外,还需考虑应力三轴因子,以提高焊接接头蠕变寿命评估的精度。
取样管
Ⅳ型开裂
蠕变空洞
USC unit
sampling tube
type Ⅳ cracking
creep voids
Abstract
The leakage reason of main steam sampling tube of one 1 000 MW USC unit was analyzed by means of macroscopic and microscopic analysis, hardness testing and piping stress calculation. The results showed that the properties of leaking was the type Ⅳ cracking in heat affected zone. The main reason of early failure was the high secondary stress for the poor flexibility of sampling tube layout. It would be paid attention to the layout of the leading-out tubes. It was suggested that the creep life evaluation of weld should take not only creep strain but also the stress triaxiality factor into account to improve the accuracy of creep life evaluation.
中图分类号 TG407
所属栏目 质量控制与失效分析
基金项目 中国华能集团科学技术项目(HNKJ04-G04)
收稿日期 2009/10/12
修改稿日期
网络出版日期
作者单位点击查看
备注唐丽英(1978-),女,工程师,硕士。
引用该论文: TANG Li-ying,KANG Yu-jun,ZHOU Rong-can,CHEN Ji-gang,LIU Hong-guo,ZHANG Hong-jun. Analysis on Type Ⅳ Cracking of Main Steam Sampling Tube in USC Unit[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2010, 46(5): 316～320
唐丽英,康豫军,周荣灿,陈吉刚,刘鸿国,张红军. 超超临界机组主蒸汽取样管Ⅳ型开裂分析[J]. 理化检验－物理分册, 2010, 46(5): 316～320
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参考文献
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【5】BRETT S J. The creep strength of weak thick section modified 9Cr forgings[C]// Proc Conf “Baltica V”. Finland: VTT, 2001．
【6】LAHA K, CHANDRAVATHI K S, PARAMESWARAN. Characterization of microstructures across the heat-affected zone of the modified 9Cr-1Mo weld joint to understand its role in promoting type Ⅳ cracking[J]. Metallurgical and Materials Transactions A, 2007,38A: 58-68．
【7】TAKASHI W, MASAAKI T, MASAYOSHI Y, et al. Creep damage evaluation of 9Cr-1Mo-V-Nb steel welded joints showing type Ⅳ fracture[J]. International Journal of Pressure Vessels and Piping, 2006, 83(1): 63-71．
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【9】SUSUMU T, TAKAHIRO S, LIU Y, et al. Improvement of creep property in high Cr heat resistant steel welded joint[C]// 3rd Symposium on Heat Resistant Steels and Alloys for High Efficiency USC Power Plants 2009. Tsukuba, Japan: [s.n.], 2009．
【10】HUDDLESTON R L. An improved multiaxial creep-rupture strength criterion[J]. Trans ASME J Press Vessel Technol , 1985, 107:421-429．
【2】BRETT S J, ALLEN D J, PACEY J. Failure of a modified 9Cr header endplate[C]// Proc Conf “Case Histories in Failure Investigation”, Milan:[s.n.], 1999: 873-884．
【3】ALLEN D J, BRETT S J. Premature failure of a P91 header endcap weld: minimising the risks of additional failures[C]// Proc Conf “Case Histories in failure Investigation”, Milan:[s.n.], 1999: 133-143．
【4】BRETT S J. Identification of weak thick section modified 9Cr forgings in service[C]// Proc Swansea Creep Conference. London: Institute of Materials, Mining and Minerals, 2001．
【5】BRETT S J. The creep strength of weak thick section modified 9Cr forgings[C]// Proc Conf “Baltica V”. Finland: VTT, 2001．
【6】LAHA K, CHANDRAVATHI K S, PARAMESWARAN. Characterization of microstructures across the heat-affected zone of the modified 9Cr-1Mo weld joint to understand its role in promoting type Ⅳ cracking[J]. Metallurgical and Materials Transactions A, 2007,38A: 58-68．
【7】TAKASHI W, MASAAKI T, MASAYOSHI Y, et al. Creep damage evaluation of 9Cr-1Mo-V-Nb steel welded joints showing type Ⅳ fracture[J]. International Journal of Pressure Vessels and Piping, 2006, 83(1): 63-71．
【8】SHIBILI A. Type Ⅳ cracking, ductility and life assessment issues in high Cr marstensitic steels[C]// 3rd Symposium on Heat Resistant Steels and Alloys for High Efficiency USC Power Plants 2009. Tsukuba, Japan: [s.n.], 2009．
【9】SUSUMU T, TAKAHIRO S, LIU Y, et al. Improvement of creep property in high Cr heat resistant steel welded joint[C]// 3rd Symposium on Heat Resistant Steels and Alloys for High Efficiency USC Power Plants 2009. Tsukuba, Japan: [s.n.], 2009．
【10】HUDDLESTON R L. An improved multiaxial creep-rupture strength criterion[J]. Trans ASME J Press Vessel Technol , 1985, 107:421-429．
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