Z6CNT18-10奥氏体不锈钢扩散管在蒸汽疏水环境中的疲劳开裂特征
Fatigue Cracking Characteristics of Diffusion Pipes for Z6CNT18-10 Austenitic Stainless Steel in Steam Hydrophobic Environment
摘 要
采用金相显微镜、扫描电镜、X射线衍射仪等对Z6CNT18-10奥氏体不锈钢扩散管在蒸汽疏水环境下的疲劳断口特征进行了研究。结果表明：与常见的疲劳裂纹常起源于外壁不同，在蒸汽疏水环境下的奥氏体不锈钢扩散管的疲劳裂纹起源于内壁，裂纹源处存在明显的氧化现象；裂纹附近的显微组织中存在一定量的驻留滑移带，疲劳条带间距很窄，几乎不存在瞬断区，属于高周疲劳。
扩散管
疲劳开裂
滑移带
austenitic stainless steel
diffusion pipe
fatigue cracking
slip band
Abstract
The fatigue fracture characteristics of diffusion pipes for Z6CNT18-10 austenitic stainless steel in steam hydrophobic environment were studied by means of metallographic microscope, scanning electron microscope and X-ray diffraction. The results show that the fatigue cracks of diffuser pipes for austenitic stainless steel in steam hydrophobic environment originated from the inner wall, and they were unlike common fatigue cracks which often originated from the outer wall. There was obvious oxidation phenomenon at the crack source. There were some stationary slip bands in the microstructures near the cracks.The fatigue bands had very narrow spacing. There was almost no the final fracture zone in the microstructures, which belongs to high cycle fatigue.
中图分类号 TG115 DOI 10.11973/lhjy-wl201905002
所属栏目 试验与研究
基金项目
收稿日期 2019/1/31
修改稿日期
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备注李心刚(1985-),男,工程师,主要从事核电厂金属材料管理、评估及失效行为研究,lixingang@cgnpc.com.cn
引用该论文: LI Xingang,GUO Kai,ZHAI Xinnian,HUANG Jincai. Fatigue Cracking Characteristics of Diffusion Pipes for Z6CNT18-10 Austenitic Stainless Steel in Steam Hydrophobic Environment[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2019, 55(5): 294～297
李心刚,郭凯,翟新年,黄进财. Z6CNT18-10奥氏体不锈钢扩散管在蒸汽疏水环境中的疲劳开裂特征[J]. 理化检验－物理分册, 2019, 55(5): 294～297
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参考文献
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【3】徐松,吴欣强,韩恩厚,等. 316Ti不锈钢在模拟核电高温高压水中的腐蚀疲劳裂纹断口研究[J]. 中国腐蚀与防护学报,2010,30(2):119-123.
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【5】何朋非,李登科,周梦保. SUS304不锈钢三通裂纹产生原因分析[J]. 理化检验(物理分册),2018,54(1):71-73.
【6】邹章雄,金少申,刘昌禄,等. 奥氏体不锈钢压力管道的应力腐蚀开裂及预防[J]. 理化检验(物理分册),2015,51(10):721-724.
【7】张晓晖,余成长. 电厂疏水管路失效原因分析及改进[J]. 华北电力大学学报(自然科学版),2012,39(1):99-104.
【8】周春林,于洪. 汽轮机主蒸汽疏水管爆管失效分析[J]. 管道技术与设备,2013(6):20-21.
【9】KAMAYA M. Assessment of thermal fatigue damage caused by local fluid temperature fluctuation (Part I:Characteristics of constraint and stress caused by thermal striation and stratification)[J]. Nuclear Engineering and Design,2014,268(1):121-138.
【10】HAYASHI M,ENOMOTO K,SAITO T,et al. Development of thermal fatigue testing apparatus with BWR water environment and thermal fatigue strength of austenitic stainless steels[J]. Nuclear Engineering and Design,1998,184(1):113-122.
【11】关锰,王冬颖,程从前,等. 海水泵叶轮316L不锈钢螺钉的腐蚀原因分析[J]. 理化检验(物理分册),2015,51(11):806-809.
【12】史宝良,李岩,张腾飞,等. 液氨储存罐304不锈钢法兰连接螺栓断裂失效分析[J]. 理化检验(物理分册),2017,53(10):740-745.
【13】ISLAM M N,ARAI Y. Ultrasonic back reflection evaluation of crack growth from PSBs in low-cycle fatigue of stainless steel under constant load amplitude[J]. Materials Science and Engineering:A,2009,520(1/2) 49-55.
【14】BALBI M,AVALOS M,BARTALI A E,et al. Microcrack growth and fatigue behavior of a duplex stainless steel[J]. International Journal of Fatigue,2009,31(11/12):2006-2013.
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