Research of stress corrosion cracking of T225NG titanium alloy in loop water of high temperature and high pressure

作     者：徐济进 严铿 陈立功 蒋成禹 

作者机构：School of Materials Science and EngineeringShanghai Jiaotong UniversityShanghai200030 School of Materials Science and EngineeringEast China Shipbuilding Institute Zhenjiang212003 

出 版 物：《China Welding》 (中国焊接（英文版）)

年 卷 期：2006年第15卷第1期

页      面：26-29页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：titanium alloy stress corrosion oxide film double cantilever beam 

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.