| Research of stress corrosion cracking of T225NG titanium alloy in loop water of high temperature and high pressure |
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| 作者姓名： | 徐济进 严铿 陈立功 蒋成禹 |
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| 作者单位： | [1]School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai, 2000301 [2]School of Materials Science and Engineering, East China Shipbuilding Institute, Zhenjiang, 212003. |
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| 摘 要： | Double cantilever beam （DCB） specimens were used to research the stress corrosion cracking of T225NG titanium alloy in loop water of high temperature and high pressure. DCB specimens were forced pre-stress, put into high pressure ataoclave , and the stress corrosion and crack expansion of specimens were observed and measured in 500 h, 1 000 h and 2000 h respectively. The results show that small expansion occurred along the direction of pre-cracking. According to calculation, the speed of cracking expansion is lower than 10 -9 m/s in 500 h and the value of K ISCC /KI is higher than 0. 75, which proves that T225NG has an excellent corrosion resistance in loop water. The main reason is that there is an oxide film on the surface of specimens. According to the analysis of energy dispersive spectroscopy （EDS） and X-ray diffraction （ XRD ） , the oxide film consists of TiO2. Therefore, the oxide film at the crack tip impedes the hydrogen separating out from the cathode to penetrate into titanium alloy and resists hydrogen embrittlement.
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| 关 键 词： | 应力腐蚀裂纹 钛合金 悬臂梁 氧化薄膜 高温高压 |
Research of stress corrosion cracking of T225NG titanium alloy in loop water of high temperature and high pressure |
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| Xu Jijin,Yan Keng,Chen Ligong,Jiang Chengyu.Research of stress corrosion cracking of T225NG titanium alloy in loop water of high temperature and high pressure[J].China Welding,2006,15(1):26-29. |
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| Authors: | Xu Jijin Yan Keng Chen Ligong Jiang Chengyu |
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| Abstract: | Double cantilever beam (DCB) specimens were used to research the stress corrosion cracking of T225NG titanium alloy in loop water of high temperature and high pressure. DCB specimens were forced pre-stress, put into high pressure autoclave, and the stress corrosion and crack expansion of specimens were observed and measured in 500 h, 1 000 h and 2 000h respectively. The results show that small expansion occurred along the direction of pre-cracking. According to calculation,the speed of cracking expansion is lower than 10 -9 m/s in 500 h and the value of KIscc/KI is higher than 0. 75, which proves that T225NG has an excellent corrosion resistance in loop water. The main reason is that there is an oxide film on the surface of specimens. According to the analysis of energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), the oxide film consists of TiO2. Therefore, the oxide film at the crack tip impedes the hydrogen separating out from the cathode to penetrate into titanium alloy and resists hydrogen embrittlement. |
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| Keywords: | titanium alloy stress corrosion oxide film double cantilever beam |
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