304L不锈钢疏水管焊接接头的腐蚀疲劳行为
Corrosion Fatigue Behavior of Welded Joints in 304L Stainless Steel Drain Pipe
摘 要
某304L不锈钢疏水管焊接接头处发生开裂失效。利用金相显微镜、扫描电镜、能谱仪，X射线衍射仪等对失效管道进行了分析；并用Ansys软件模拟分析了管内流体流速对管道受力情况的影响。结果表明：两疏水管道的失效形式均为腐蚀疲劳开裂，裂纹均在焊接接头的焊趾处萌生，且均为多源开裂；水流经过时，焊接接头附近形成负压区，导致该部位多处发生空泡腐蚀；空泡腐蚀产生的腐蚀坑处应力集中，成为疲劳裂纹源；空泡爆破时产生的巨大冲击应力造成管道振动，引发腐蚀疲劳破裂。
不锈钢
腐蚀疲劳
空泡腐蚀
welded joint
stainless steel
corrosion fatigue
cavitation corrosion
Abstract
Cracking failure occurred at the welded joints of two 304L stainless steel drain pipes. The failed pipes were investigated by metallographic microscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). And Ansys software was used to simulate and analyze the influence of fluid rate on the stress distribution in the pipes. The results show that the failure modes of the two drain pipes were corrosion fatigue cracking. All cracks were initiated at the weld toes of the welded joints with several crack sources. When water flew, a negative pressure area was formed near the welded joint, leading to cavitation corrosion at many places in the area. Corrosion pits generated by cavitation corrosion were the stress concentration points and became sources of fatigue cracks. The tremendous impact stress caused by cavitation blasting could induce pipe vibration, which finally led to corrosion fatigue cracking.
中图分类号 TG174 DOI 10.11973/fsyfh-201908012
所属栏目 失效分析
基金项目
收稿日期 2019/1/1
修改稿日期
网络出版日期
作者单位点击查看
引用该论文: BIAN Chunhua,ZHANG Wei,LIU Hongqun,WANG Yunwei,WEN Jie. Corrosion Fatigue Behavior of Welded Joints in 304L Stainless Steel Drain Pipe[J]. Corrosion & Protection, 2019, 40(8): 608
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参考文献
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【2】SUN H, WU X Q, HAN E H. Effects of temperature on the oxide film properties of 304 stainless steel in high temperature lithium borate buffer solution. Corrosion Science, 2009, 51(12):2840-2847.
【3】KARLSEN W, DIEGO G, DEVRIENT B. Localized deformation as a key precursor to initiation of intergranular stress corrosion cracking of austenitic stainless steels employed in nuclear power plants. Journal of Nuclear Materials, 2010, 406(1):138-151.
【4】LO K H, SHEK C H, LAI J K L. Recent developments in stainless steels. Materials Science and Engineering:R:Reports, 2009, 65(4/5/6):39-104.
【5】WU H C, YANG B, WANG Y Q. Effect of sigma phase on the low cycle fatigue property of Z3CN20.09M cast duplex stainless steel in high temperature water. Materials and Corrosion, 2015, 66(7):663-669.
【6】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. 中国腐蚀与防护学报, 2010, 30(2):119-123.
【7】徐松, 吴欣强, 韩恩厚,等. 核电站用钢的高温高压水腐蚀疲劳研究进展. 腐蚀科学与防护技术, 2007, 19(5):345-349.
【8】徐松, 吴欣强, 韩恩厚,等. 硫和溶解氧含量对低合金钢高温高压水腐蚀疲劳性能的影响. 腐蚀与防护, 2010, 31(11):825-828.
【9】XU S, WU X Q, HAN E H, et al. Crack initiation mechanisms for low cycle fatigue of type 316Ti stainless steel in high temperature water. Materials Science and Engineering:A, 2008, 490(1/2):16-25.
【10】WU X Q, HAN E H, KE W, et al. Effects of loading factors on environmental fatigue behavior of low-alloy pressure vessel steels in simulated BWR water. Nuclear Engineering and Design, 2007, 237(12/13):1452-1459.
【11】KAMAYA M. Environmental effect on fatigue strength of stainless steel in PWR primary water-Role of crack growth acceleration in fatigue life reduction. International Journal of Fatigue, 2013, 55:102-111.
【12】郭辉, 刘强, 刘满平,等. 6061铝合金ECAP变形前后的空泡腐蚀试验研究. 轻合金加工技术, 2013, 41(12):42-48.
【13】刘强, 李波, 陈希章,等. Cr-Co-Ni-Mn奥氏体钢的空泡腐蚀研究. 腐蚀科学与防护技术, 2012, 24(5):381-384.
【14】雷玉成, 秦敏明, 徐桂芳, 等. Cr-Ni-Co奥氏体堆焊材料的空泡腐蚀行为. 焊接学报, 2011, 32(6):21-24.
【15】雷玉成, 李涛, 秦敏明, 等. Cr-Ni-Mo双相不锈钢的空泡腐蚀行为. 材料科学与工艺, 2011, 19(3):128-131.
【16】陈卫. 几种海洋工程常用金属的空泡腐蚀性能. 热加工工艺, 2015, 44(8):17-20.
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【18】李洪梅, 孙大千, 王文权,等. 奥氏体不锈钢丝激光焊接头的组织与力学性能. 焊接学报, 2009, 30(6):71-74.
【19】张瑶. 2205双相不锈钢焊接结构应力腐蚀疲劳性能研究. 重庆:重庆交通大学, 2013.
【20】TAN H, WANG Z Y, JIANG Y M, et al. Annealing temperature effect on the pitting corrosion resistance of plasma arc welded joints of duplex stainless steel UNS S32304 in 1.0M NaCl. Corrosion Science, 2011, 53(6):2191-2200.
【21】XIE Y, ZHANG J S. Chloride-induced stress corrosion cracking of used nuclear fuel welded stainless steel canisters:A review. Journal of Nuclear Materials, 2015, 466:85-93.
【22】TSYRUL'NYK O T, BASSARAB A I. Structural sensitivity of steels to corrosion-mechanical fracture under conditions of fatigue and cavitation. Materials Science, 1999, 35(4):581-586.
【23】杨汝钧. 国外舰船用铜合金螺旋桨材料. 国外舰船技术(材料类), 1981(9):1-14.
【24】汤文新. 舰船螺旋桨用材料及特种试验技术的研究. 舰船科学技术, 1998, 20(3):56-65.
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