The Effects of Microstructure on Resistance to HIC of High- Strength Pipeline
Based on the standard HIC (Hydrogen Induced Cracking) test, by the methods, such as OM, SEM and TEM etc. , the corrosion cracking behayior of high-strength pipeline steel in H2S saturated solution was studied. The effect of microstructure, especially the band structure on the resistance of HIC was analyzed. Meanwhile the sensitivity of HIC for dislocation and precipitation was also studied. The results showed that polygonal feixite or acicular feixite have good property of resistance to H2s corrosion,and the structure of pearlite-ferrite has good anti-HIC performance while its hardness keeps less than HV203 and the S content is lower than 0. 004%. It has great help for the improving strength , toughness and promotes the formiation of acicular ferrite of the steel by adding Mo, which greatly improves the microstructure to improve anti-HIC performance. Since the final cooling temperature was lowered, the low-temperature brittle phase as crack initiation and expansion of channels fomis, so that the material properties of HIC resistance decreased significantly. I he higher the dislocation density of the materials is, the worse the anti-HIC performance is. The effect of precipitates of Nb and Ti on the dislocation pinning enhances the anti-HIC steels performance of steel, so the precipitates of micro-alloying elements could enhance anti-hydrogen sulfide corrosion of pipeline steel.
Cai Qingwu Zhang Junsheng Wu Huibin Zhang Yan
National Engineering Research Center for Advanee Rolling Teehnology, University of Science and Technology Beijing, China
国际会议
10th International Conference on Steel Rolling(第十届国际轧钢大会)
北京
英文
1-7
2010-09-15（万方平台首次上网日期，不代表论文的发表时间）