The sulfide stress corrosion cracking（ SSC） performance of G3 and 028 nickel-based alloys w as studied using slow strain rate test（ SSRT） and the four-point bend（ FPB） test under simulated dow nhole conditions. ...The sulfide stress corrosion cracking（ SSC） performance of G3 and 028 nickel-based alloys w as studied using slow strain rate test（ SSRT） and the four-point bend（ FPB） test under simulated dow nhole conditions. The effect of high temperature,high H2 S / CO2 partial pressure,and the presence of sulfur on SSC susceptibility w as investigated. The G3 alloy w as found to have a higher SSC resistance than the 028 alloy. Presence of sulfur and temperature bear a strong influence on the SSC performance of the metals,particularly on the 028 alloy. The applicability of 028 and G3 alloys may be expanded and both could safely be used beyond the limits set by the ISO15156-3 standard.展开更多
In this study,hydrogen-induced cracking（HIC） and sulfide stress corrosion cracking（SSC） behaviors of highstrength pipeline steels in four different strength grades（X70,X80,X90 and X100） with the microstructure o...In this study,hydrogen-induced cracking（HIC） and sulfide stress corrosion cracking（SSC） behaviors of highstrength pipeline steels in four different strength grades（X70,X80,X90 and X100） with the microstructure of acicular ferrite were estimated.The results showed that both of X70 and X80 steels exhibited better HIC resistance,and their susceptibility to HIC increased with the strength grade.HIC parameters,including cracking length ratio,cracking thickness ratio（CTR） and cracking sensitivity ratio,were all increased,and among these,the CTR increased most,with the increase in the strength grade.HIC was found to initiate and grow along the hard boundaries such as large size martensite/austenite（M/A） islands and bainitic ferrite.In addition,the density of hydrogen-induced blister on the steel surface was increased with the decrease in p H value for the same-grade pipeline steels.SSC susceptibilities of X80,X90 and X90-C were revealed to subsequently decrease,which was related to the large size M/A islands.展开更多
文摘The sulfide stress corrosion cracking（ SSC） performance of G3 and 028 nickel-based alloys w as studied using slow strain rate test（ SSRT） and the four-point bend（ FPB） test under simulated dow nhole conditions. The effect of high temperature,high H2 S / CO2 partial pressure,and the presence of sulfur on SSC susceptibility w as investigated. The G3 alloy w as found to have a higher SSC resistance than the 028 alloy. Presence of sulfur and temperature bear a strong influence on the SSC performance of the metals,particularly on the 028 alloy. The applicability of 028 and G3 alloys may be expanded and both could safely be used beyond the limits set by the ISO15156-3 standard.
基金supported by the National Key Technologies R&D Program of China (No.2011BAE25B03)
文摘In this study,hydrogen-induced cracking（HIC） and sulfide stress corrosion cracking（SSC） behaviors of highstrength pipeline steels in four different strength grades（X70,X80,X90 and X100） with the microstructure of acicular ferrite were estimated.The results showed that both of X70 and X80 steels exhibited better HIC resistance,and their susceptibility to HIC increased with the strength grade.HIC parameters,including cracking length ratio,cracking thickness ratio（CTR） and cracking sensitivity ratio,were all increased,and among these,the CTR increased most,with the increase in the strength grade.HIC was found to initiate and grow along the hard boundaries such as large size martensite/austenite（M/A） islands and bainitic ferrite.In addition,the density of hydrogen-induced blister on the steel surface was increased with the decrease in p H value for the same-grade pipeline steels.SSC susceptibilities of X80,X90 and X90-C were revealed to subsequently decrease,which was related to the large size M/A islands.
