王 博,张 玮,$2.恒位移条件下X70钢在硝酸盐环境中的裂纹扩展行为[J].轻工机械,2011,29(3): |
恒位移条件下X70钢在硝酸盐环境中的裂纹扩展行为 |
Crack Propagation Behavior of X70 Pipeline Steel in Nitrate under Loading with Constant Displacement |
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DOI: |
中文关键词: 应力腐蚀 裂纹扩展速率 楔形张开加载 管线钢 硝酸盐 |
英文关键词:stress corrosion crack propagation rate wedge open loading pipeline steel nitrate. |
基金项目:科技部“十一五”科技支撑计划项目(2006BAK02B02-02) |
王 博 张 玮 $2 |
1.浙江医药高等专科学校 药学系;2.浙江工业大学 化工机械研究所 |
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中文摘要: |
采用楔形张开加载(WOL)预裂纹试样应力腐蚀试验方法,研究了X70管线钢在NO3- -H2S-Cl-复杂介质中的裂纹扩展速率。结果表明,X70钢在近中性800 g/L NaNO3及NaNO3-H2S-NaCl 环境下裂纹扩展速率均较低;在同种环境下,KIi近似相等时,X70钢的裂纹扩展速率da/dt大小关系为焊缝区大于母材;X70钢母材及焊材在H2S-Cl-中的裂纹扩展速率略大于在NO3- -H2SCl-中的速率。 |
英文摘要: |
WOL test method was adopted to conduct experimental research on crack propagation rate of X70 pipeline steel under complex medium condition of NO3- -H2S-Cl-. The results show that the crack propagation rates of X70 WOL specimen are relatively low in the near neutral 800 g/L NaNO3environment or containing NaNO3-H2S-NaCl;In the experimental environment at approximately equal KIi, the order of magnitudes of crack propagation rate da/dt of X70 steel is weld zone >masterbatch; The crack propagation rate of X70 srteel masterbatch in H2S-Cl- is slightly higher than those in NO3- -H2SCl-. |
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